Carrier Air Conditioner 50RHE006 060 User Manual

Aquazone™

50RHE006-060

Water Source Heat Pumps

Horizontal Unit

50 Hz, CE Mark

R-407C

Installation, Start-Up, and

Service Instructions

Page

CONTENTS

Ground Coupled, Closed Loop and Plateframe

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . .1,2

GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Step 1 — Check Jobsite . . . . . . . . . . . . . . . . . . . . . . . . 2

Step 2 — Check Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

• STORAGE

Heat Exchanger Well Systems . . . . . . . . . . . . . . . . 21

OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21,22

Power Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Units with Aquazone Complete C Control . . . . . . . 21

Units with Aquazone Deluxe D Control . . . . . . . . . . 21

SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22,23

Test Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Retry Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Aquazone Deluxe D Control LED Indicators . . . . . 23

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23-25

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Water Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Condensate Drain Pans . . . . . . . . . . . . . . . . . . . . . . . . . 24

Refrigerant System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Condensate Drain Cleaning . . . . . . . . . . . . . . . . . . . . . 24

Air Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Condenser Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Checking System Charge . . . . . . . . . . . . . . . . . . . . . . . 24

Refrigerant Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Air Coil Fan Motor Removal . . . . . . . . . . . . . . . . . . . . . 25

• PROTECTION

• INSPECT UNIT

Step 3 — Unit Location. . . . . . . . . . . . . . . . . . . . . . . . . . . 6

• FIELD CONVERSION OF DISCHARGE AIR

Step 4 — Mounting the Unit . . . . . . . . . . . . . . . . . . . . . . 7

Step 5 — Duct System . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

• SOUND ATTENUATION

• EXISTING DUCT SYSTEM

Step 6 — Condensate Drain . . . . . . . . . . . . . . . . . . . . . . 7

• VENTING

Step 7 — Piping Connections . . . . . . . . . . . . . . . . . . . . 8

• WATER LOOP APPLICATIONS

• GROUND-WATER APPLICATIONS

• GROUND-LOOP APPLICATIONS

Step 8 — Electrical Wiring. . . . . . . . . . . . . . . . . . . . . . . . 9

• POWER CONNECTION

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 25-27

Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Control Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

• SUPPLY VOLTAGE

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . CL-1, CL-2

• 220-VOLT OPERATION

• PSC BLOWER SPEED SELECTION

Step 9 — Low Voltage Wiring. . . . . . . . . . . . . . . . . . . . 16

• THERMOSTAT CONNECTIONS

IMPORTANT: Read the entire instruction manual before

starting installation.

• WATER FREEZE PROTECTION

• AIR COIL FREEZE PROTECTION

• ACCESSORY CONNECTIONS

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical compo-

nents. Only trained and qualified service personnel should

install, repair, or service air-conditioning equipment.

• WATER SOLENOID VALVES

PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16,17

System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

FIELD SELECTABLE INPUTS . . . . . . . . . . . . . . . .17,18

C Control Jumper Settings . . . . . . . . . . . . . . . . . . . . 17

C Control DIP Switches . . . . . . . . . . . . . . . . . . . . . . . 17

D Control Jumper Settings . . . . . . . . . . . . . . . . . . . . 17

D Control DIP Switches . . . . . . . . . . . . . . . . . . . . . . . 17

D Control Accessory Relay Configurations . . . . . 18

Water Valve (Slow Opening) . . . . . . . . . . . . . . . . . . . 18

Outdoor Air Damper (OAD) . . . . . . . . . . . . . . . . . . . . 18

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-21

Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Scroll Compressor Rotation. . . . . . . . . . . . . . . . . . . . . 19

Unit Start-Up Cooling Mode . . . . . . . . . . . . . . . . . . . . . 19

Unit Start-Up Heating Mode . . . . . . . . . . . . . . . . . . . . . 19

Flow Regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Cooling Tower/Boiler Systems . . . . . . . . . . . . . . . . . . 21

Untrained personnel can perform basic maintenance func-

tions of cleaning coils and filters and replacing filters. All other

operations should be performed by trained service personnel.

When working on air-conditioning equipment, observe precau-

tions in the literature, tags and labels attached to the unit, and

other safety precautions that may apply.

Improper installation, adjustment, alteration, service, main-

tenance, or use can cause explosion, fire, electrical shock or

other conditions which may cause personal injury or property

damage. Consult a qualified installer, service agency, or your

distributor or branch for information or assistance. The

qualified installer or agency must use factory-authorized kits or

accessories when modifying this product. Refer to the individ-

ual instructions packaged with the kits or accessories when

installing.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 005-00042 Printed in U.S.A. Form 50RHE-C1SI Pg 1 2-04 Replaces: New

Book 1

Tab 5a 5a

3. Do not remove the packaging until the unit is ready for

installation.

4. Verify that the refrigerant tubing is free of kinks or dents,

and that it does not touch other unit components.

5. Inspect all electrical connections. Be sure connections are

clean and tight at the terminals.

6. Compressors are internally isolated. Compressors

equipped with external spring vibration isolators must

have bolts loosened and shipping clamps removed.

DO NOT store or install units in corrosive environments or

in locations subject to temperature or humidity extremes

(e.g., attics, garages, rooftops, etc.). Corrosive conditions

and high temperature or humidity can significantly reduce

performance, reliability, and service life. Always move

units in an upright position. Tilting units on their sides may

cause equipment damage.

7. Remove any blower support cardboard from inlet of the

blower.

8. Locate and verify any accessory kit located in compressor

section.

9. Remove any access panel screws that may be difficult to

remove once unit is installed.

INSPECT UNIT — To prepare the unit for installation, com-

plete the procedures listed below:

1. Compare the electrical data on the unit nameplate with

ordering and shipping information to verify that the

correct unit has been shipped.

2. Verify that the unit is the correct model for the entering

water temperature of the job.

Table 1 — Physical Data — Aquazone™ 50RHE006-060 Units

UNIT 50RHE

COMPRESSOR (1 each)

FACTORY CHARGE R-407C (kg)

006

009

012

015

019

024

030

036

042

048

060

Scroll

2.41

Rotary

Reciprocating

0.34

0.37

0.68

0.88

0.91

1.19

1.36

1.19

1.59

PSC FAN MOTOR AND BLOWER

Fan Motor Type/Speeds

PSC/3

1 [746]

279 x 254

Fan Motor (Hp) [w]

/₂₅[30]

₁₀[75]

₆[124]

₅[150]

₃[250]

₂[373]

₄[560]

/₄[560]

Blower Wheel Size (D x W) (mm)

127 x 127 127 x 127 152 x 127 152 x 127 152 x 127 152 x 127 152 x 127 254 x 254 254 x 254 254 x 254

WATER CONNECTION SIZE (in.) (FPT)

HORIZONTAL

Air Coil

Dimensions (H x W) (mm)

Total Face Area (m²)

Tube Size (mm)

254 x 406

0.103

9.5

406 x 406

0.165

457 x 559

0.255

457 x 787

508 x 889

0.452

0.360

9.5

2.2

9.5

2.2

9.5

2.2

9.5

Distance Between Fins (mm)

Number of Rows

Filter Standard Throwaway

(Qty — Size, mm)

Weight 25.4-mm (kg)

Operating

2.2

2.7

1 — 305 x 508

1 — 635 x 508

1 — 254 x 508

1 — 406 x 508

1 — 457 x 610

2 — 457 x 457

50.0

54.5

50.9

55.5

55.0

59.5

66.8

71.4

76.8

81.4

87.7

92.3

99.5

105.0

104.1

109.5

116.8

122.3

121.4

126.8

146.8

153.6

Packaged

LEGEND

PSC — Permanent Split Capacitor

NOTES:

1. All units have spring compressor mountings, TXV (thermostatic expan-

sion valve) expansion devices, and ¹/₂- and ³/₄-in. electrical knockouts.

2. Size 048 available as high-static unit.

WATER

CONNECTIONS

ELECTRICAL KNOCKOUTS (in.)

OVERALL

CABINET

DISCHARGE CONNECTION

RETURN CONNECTION

Duct Flange Installed ( 0.10 in.)

Using Return Air Opening

50RHE

UNITS

Loop

Water

FPT

conduit

Low

Voltage

Ext

Pump

Power

Supply

Cond-

ensate

Supply Supply

Height Depth

Return Return

Depth Height

(in.)

Width Depth Height In Out

in.

22.4

56.8

43.1

11.3

28.7

2.4

5.4

0.6

1.5

3.5

8.9

5.5

8.2

5.8

4.0

5.8

8.0

5.8

1.5

3.8

17.1

43.4

9.3

2.2 1.0

5.6 2.5

006-012

015-024

030

109.5

6.1 13.7

14.0

20.8

14.7 10.2

14.7

20.3

14.7

23.6

in.

22.4

56.8

43.1

109.5

17.3

43.9

2.4 4.9

6.1 12.4

2.4 5.4

6.1 13.7

2.4 5.4

6.1 13.7

2.4 5.4

6.1 13.7

2.4 5.4

6.1 13.7

0.6

1.5

3.5

8.9

7.5

19.1

10.2

25.9

5.0

12.7 14.2

5.6

10.4

26.4

9.3

23.6

5.0

12.7

1.5

3.8

17.1

43.4

15.3

38.9

2.2 1.0

5.6 2.5

in.

22.4

56.8

53.2

135.1

19.3

49.0

0.6

1.5

5.7

14.5

9.7

24.6

12.2

31.0

5.0 6.8

12.7 17.3

10.4

26.4

9.3

23.6

5.0

12.7

2.1

5.3

23.1

58.7

17.3

43.9

2.2 1.0

5.6 2.5

in.

22.4

56.8

53.2

135.1

19.3

49.0

0.6

1.5

5.7

14.5

9.7

24.6

12.2

31.0

2.9

7.4

3.8

9.7

13.5

34.3

13.1

33.3

2.9

7.4

1.9

4.8

23.1

58.7

17.3

43.9

2.2 1.0

5.6 2.5

036

in.

22.4

56.8

62.2

158.0

19.3

49.0

0.6

1.5

5.7

14.5

9.7

24.6

12.2

31.0

2.9

7.4

3.8

9.7

13.5

34.3

13.1

33.3

2.9

7.4

1.9

4.8

32.1

81.5

17.3

43.9

2.2 1.0

5.6 2.5

042-048

060

in.

25.4

64.5

71.2

180.8

21.3

54.1

0.6

1.5

8.1

20.6

11.7

29.7

14.2

36.1

5.8

14.7 12.7

5.0

13.6

34.5

13.3

33.8

5.8

14.7

2.9

7.4

36.1

91.7

19.3

49.0

2.2 1.0

5.6 2.5

NOTES:

1. Condensate is / -in. FPT copper.

2. Horizontal unit shipped with filter bracket only. This bracket should be removed for return duct connection (front).

3. Hanger kit is factory installed. Isolation grommets are provided.

4. Right and left orientation is determined by looking at water connection side.

LEFT RETURN

RIGHT RETURN

Legend

CAP=Control Access Panel

2’ [61cm] Service

Access *

Front

2’ [61cm]

Service

Access *

CSP

Optional 2’ [61cm]

Service Access *

CSP=Compressor Service Panel

BSP=Blower Service Panel

ASP=Alternate Service Panel

Front

ASP

Optional 2’ [61cm]

Service Access *

Left Return

Power Supply

3 / 4” Knockout

1 / 2”

Knockout

Right Return

3.25

CSP

3.25

[82.6mm]

Low Voltage

1 / 2” Knockout

CAP

Left

Discharge

Right

Discharge

Condensate

3 / 4” FPT

Back

Discharge

Back

Discharge

Condensate

3 / 4” FPT

Front-View

Unit Hanger Detail

BSP

Blower

Outlet

BSP

MODEL

Blower

Outlet

006-024

030-036

042-048

060

43.1 109.5

53.1 134.9

62.1 157.7

71.1 180.6

24.4

27.4

61.9

69.5

20.4

23.4

51.8

59.4

Right Return Back Discharge

Left Return Back Discharge

Blower

Outlet

BSP

ASP

BSP

CSP

Blower

Outlet

Front

Right Return Left Discharge

Left Return Right Discharge

Air Coil

[27.9mm]

Air Coil

CSP

ASP

Front

Left Return Left View -

Air Coil Opening

Right Return Right View -

Air Coil Opening

* Note: Shaded areas are recommended service areas, not required.

Fig. 1 — 50RHE Dimensional Data

ReturnLoop

Supply Loop

Filter Access

Water Out

Water In

Field-Supplied

Electric Heat

(if applicable)

Step 3 — Unit Location — The following guidelines

should be considered when choosing a location for a WSHP

unit:

• Units are for indoor use only

• Locate in areas where ambient temperatures are between

4.4 C and 37.8 C and relative humidity is no greater than

75%

• Provide sufficient space for water, electrical and duct

connections

• Locate unit in an area that allows easy access and

removal of filter and access panels

• Allow enough space for service personnel to perform

maintenance

• Return air must be able to freely enter the space if unit

needs to be installed in a confined area such as a closet

NOTE: Correct placement of the horizontal unit can play an

important part in minimizing sound problems. Since duct-

work is normally applied to these units, the unit can be

placed so that the principal sound emission is outside the oc-

cupied space in sound-critical applications. A fire damper

may be required by the local code if a fire wall is penetrated.

FIELD CONVERSION OF DISCHARGE AIR — The dis-

charge air of the 50RHE horizontal units can be converted

between side and back discharge in the field. The conversion

process is the same for right and left return configurations. See

Fig. 3 and 4.

NOTE: It is not possible to convert return air between left or

right return models in the field due to refrigerant piping

changes.

Preparation — The unit should be on the ground in a well lit

area for conversion. Hung units should be taken down to

ground level before converting.

Side to Back Discharge Conversion

1. Remove screws to free the top and discharge panels. See

Fig. 3.

2. Remove the access panel and set aside.

3. Lift the discharge panel from side of unit and rotate it to

back using care not to damage blower wiring.

4. Check blower wire routing and connections for excessive

tension or contact with sheet metal edges. Re-route if

necessary.

5. Check refrigerant tubing for contact with other compo-

nents. Adjust if necessary.

Step 4 — Mounting the Unit — Horizontal units

should be mounted using the factory-installed hangers. Proper

attachment of hanging rods to building structure is critical for

safety. See Fig. 2 and 5. Rod attachments must be able to sup-

port the weight of the unit. See Table 1 for unit operating

weights.

Step 6 — Condensate Drain — Slope the unit to-

ward the drain at a 6.5 mm per 30 cm pitch. See Fig. 6. If it is

not possible to meet the required pitch, install a condensate

pump at the unit to pump condensate to building drain.

Horizontal units are not internally trapped; therefore an ex-

ternal trap is necessary. Install each unit with its own individual

trap and means to flush or blowout the condensate drain line.

Do not install units with a common trap or vent. For typical

condensate connections see Fig. 7.

Step 5 — Duct System — Size the duct system to han-

dle the design airflow quietly.

NOTE: Depending on the unit, the fan wheel may have a ship-

ping support installed at the factory. This must be removed

before operating unit.

NOTE: Never use a pipe size smaller than the connection.

VENTING — Install a vent in the condensate line of any

application that may allow dirt or air to collect in the line. Con-

sider the following:

SOUND ATTENUATION — To eliminate the transfer of

vibration to the duct system, a flexible connector is recom-

mended for both discharge and return air duct connections on

metal duct systems. The supply and return plenums should

include internal duct liner of fiberglass or be made of duct

board construction to maximize sound attenuation of the

blower. Installing the WSHP unit to uninsulated ductwork in an

unconditioned space is not recommended since it will sweat

and adversely affect the unit’s performance.

• Always install a vent where an application requires a

long horizontal run.

• Always install a vent where large units are working

against higher external static pressure and to allow

proper drainage for multiple units connected to the same

condensate main.

• Be sure to support the line where anticipated sagging from

the condensate or when “double trapping” may occur.

• If condensate pump is present on unit, be sure drain con-

nections have a check valve to prevent back flow of con-

densate into other units.

To reduce air noise, at least one 90 degree elbow could be

included in the supply and return air ducts, provided system

performance is not adversely impacted. The blower speed can

also be changed in the field to reduce air noise or excessive air-

flow, provided system performance is not adversely impacted.

EXISTING DUCT SYSTEM — If the unit is connected to

existing ductwork, consider the following:

• Verify that the existing ducts have the proper capacity to

handle the unit airflow. If the ductwork is too small,

install larger ductwork.

• Check existing ductwork for leaks and repair as

necessary.

65 mm Pitch for

Drainage

NOTE: Local codes may require ventilation air to enter the

space for proper indoor air quality. Hard-duct ventilation may

be required for the ventilating air supply. If hard ducted venti-

lation is not required, be sure that a proper air path is provided

for ventilation air to unit to meet ventilation requirement of the

space.

Pitch Toward

Drain

Drain Connection

Fig. 6 — Horizontal Unit Pitch

Compressor

Section

Air Handler

Section

DIMENSIONS (mm)

50RHE UNITS

NOTE: Trap should be deep enough to offset maximum unit static

difference. A 102 mm trap is recommended.

006-024

030,036

042,048

060

568

645

1095

1349

1577

1806

619

695

1095

1349

1577

1806

518

594

Fig. 7 — Trap Condensate Drain

Fig. 5 — Horizontal Hanger Bracket

(Factory Installed)

In addition to complying with any applicable codes, consid-

er the following for system piping:

• Piping systems using water temperatures below 10 C

require 12.7 mm closed cell insulation on all piping

surfaces to eliminate condensation.

• Avoid all plastic to metal threaded fittings due to the

potential to leak. Use a flange fitted substitute.

• Teflon tape thread sealant is recommended to minimize

internal fouling of the heat exchanger.

• Use backup wrench. Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• Flush the piping system prior to operation to remove dirt

and foreign materials from the system.

Step 7 — Piping Connections — Depending on the

application, there are 3 types of WSHP piping systems to

choose from: water loop, ground-water and ground loop. Refer

to Piping Section of Carrier System Design Manual for addi-

tional information.

All WSHP units use low temperature soldered female pipe

thread fittings for water connections to prevent annealing and

out-of-round leak problems which are typically associated with

high temperature brazed connections. Refer to Table 1 for

connection sizes. When making piping connections, consider

the following:

• Use a backup wrench when making screw connections to

unit to prevent internal damage to piping.

• Insulation may be required on piping to avoid condensa-

tion in the case where fluid in loop piping operates at

temperatures below dew point of adjacent air.

• Piping systems that contain steel pipes or fittings may

be subject to galvanic corrosion. Dielectric fittings

should be used to isolate the steel parts of the system to

avoid galvanic corrosion.

GROUND-WATER APPLICATIONS — Typical ground-

water piping is shown in Fig. 8. In addition to complying

with any applicable codes, consider the following for sys-

tem piping:

• Install shut-off valves for servicing.

• Install pressure-temperature plugs to measure flow and

temperature.

WATER LOOP APPLICATIONS — Water loop applications

usually include a number of units plumbed to a common pip-

ing system. Maintenance to any of these units can introduce air

into the piping system. Therefore, air elimination equipment

comprises a major portion of the mechanical room plumbing.

• Connect boiler drains and other valves using a “T” con-

nector to allow acid flushing for the heat exchanger.

• Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• Use PVC SCH80 or copper piping material.

The flow rate is usually set between 0.040 and 0.054 l/s per

kW of cooling capacity. For proper maintenance and servicing,

pressure-temperature (P/T) ports are necessary for temperature

and flow verification.

NOTE: PVC SCH40 should not be used due to system high

pressure and temperature extremes.

Water

Control

Valve

Flow

Regulator

Pressure

Tank

Water Out

Water In

From Pump

Shut-Off

Valve

Strainer – Field-Installed Accessory

(16 to 20 mesh recommended for

filter sediment)

Boiler

Drains

Pressure-

Temperature

Plugs

Fig. 8 — Typical Ground-Water Piping Installation

Water Supply and Quantity — Check water supply. Water

supply should be plentiful and of good quality. See Table 2 for

water quality guidelines.

Step 8 — Electrical Wiring

In all applications, the quality of the water circulated

through the heat exchanger must fall within the ranges listed in

the Water Quality Guidelines table. Consult a local water treat-

ment firm, independent testing facility, or local water authority

for specific recommendations to maintain water quality within

the published limits.

All field installed wiring, including the electrical ground,

MUST comply with applicable local, national and regional

codes.

Refer to unit wiring diagrams Fig. 9-12 for a schematic of

the field connections, which must be made by the installing (or

GROUND-LOOP APPLICATIONS — Temperatures between

–4 to 43 C and a liquid flow rate of 0.040 to 0.054 l/s per kW of

cooling capacity is recommended. In addition to complying

with any applicable codes, consider the following for system

piping:

• Limit piping materials to only polyethylene fusion in the

buried sections of the loop.

• Do not use galvanized or steel fittings at any time due to

corrosion.

• Avoid all plastic to metal threaded fittings due to the

potential to leak. Use a flange fitted substitute.

• Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• Use pressure-temperature (P/T) plugs to measure flow of

pressure drop.

G/Y

START ASSIST

(WHEN NEEDED)

EARTH (GRD)

POWER SUPPLY

REFER TO

DATA PLATE

USE COPPER

CONDUCTORS

ONLY

RED*

RED

BLU*

BLU

CAP

YEL

RED

BLK

N (NEUTRAL)

RED

COMPRESSOR

BLK

CAPACITOR

BRN

YEL

PSC

(

)

L 3

YEL OR WHT

BLU

FAN

(

M 2

MTR

(

H 1

SEE NOTE 3

TRANS

3 AIR FLOW SETTINGS

(FCTRY SETTING - MED)

CB*

YEL

BLK

RED

SEE NOTE 8

G/Y

24V

COMPONENT LOCATION

220V

BLU

ORG

240V

SEE

NOTE 7

CAP

BRN

GRY

YEL

BRN

SEE

NOTE 7

BR BRG CCG

TEST PINS

COMPRESS.

RELAY

SEE

RED

NOTE 5

TYPICAL

T-STAT

SEE

BLU

BRN

GRY

TRANS

LOC

COMPR.

NOTE 4

SIZES: 015-036

SEE NOTE 4

FP1

JW3

DIP SWITCH

FP1

LOW TEMP

STAGE 2

GRY

COOLING

FAN

NOT USED

(

)

TXV UNITS

FP2

JW2

VIO

NOT USED

1 OR 3

TRIES

VIO

FP2

(

CAP -TUBE

FP2

LOW TEMP

)

UNITS OR

24 VAC

OFF ON

BRN

COMMON

ALARM

RVS

ORG

NOT USED

YEL

STATUS

LED

JWI

AL1

AL2

CO 12

SEE NOTE 6 FOR

DRY ALARM CONTACT

CXM

MICRO-

PROCESSOR

CONTROL LOGIC

SEE

ALARM

NOTE

RELAY

24V

EH1

EH2

CAP

TRANS

SIZES: 006, 009, 012

LEGEND

— Alarm Relay Contacts

— Blower Relay

— Performance Monitor

Condensate Pan

Circuit Breaker

PSC

RVS

— Permanent Split Capacitor

— Reversing Valve Solenoid

CAP — Compressor Capacitor

FP1

FP2

— Circuit Breaker

— Compressor Contactor

— Sensor, Condensate Overflow

— Sensor, Water Coil Freeze Protection

— Sensor, Air Coil Freeze Protection

TRANS — Transformer Optional Wiring

Field Line Voltage Wiring

Field Low Voltage Wiring

Printed Circuit Trace

Relay Contacts — N.C.

Solenoid Coil

Relay Contacts — N.O.

Switch Temperature

Switch Low Pressure

Ground

GND — Ground

Optional Wiring

— High-Pressure Switch

— Clippable Field Selection Jumper

Relay/Contactor Coil

LOC — Loss of Charge Pressure Switch

— Field Wiring Terminal Block

— Power Block

Thermistor

Wire Nut

*Optional wiring.

NOTES:

1. Compressor and blower motor thermally protected internally.

2. All wiring to the unit must comply with NEC and local codes.

3. Transformer is wired to 240 v (ORG) lead for 240/50/1 units,

switch RED and ORG leads to PB(1) and insulate ORG lead.

4. FP1 thermistor provides freeze protection for water. When using

antifreeze solutions, cut JW3 jumper.

5. Typical heat pump thermostat wiring shown. Refer to thermostat

installation instructions for wiring to the unit.

G/Y

EARTH (GND)

N (NEUTRAL)

GROUND

LUG

POWER SUPPLY

REFER TO

DATA PLATE

USE COPPER

CONDUCTORS

ONLY

BLK

COMPONENT LOCATION

LUG

BLK L1

BLK

YEL

BR2

BLK

BLU

RED

SEE NOTE 3

YEL OR

CB* TRANS

BLK

WHT

BR1

BR2

RED

BRN

(220V)

ORG

(240V)

SEE

NOTE 7

BRN YEL

CCG

GRY

BRN

SEE

NOTE 7

TRANS

BRG

TEST PINS

COMPRESSOR

RELAY

RED

BLU

BRN

GRY

SEE NOTE 5

TYPICAL

T-STAT

SEE

NOTE 4

JW3

FP1

LOW TEMP

JW2

FP2

LOW TEMP

LOC

COMPR.

SEE NOTE 4

FP1

FP2

GRY

VIO

(CAP-TUBE

UNITS) OR

COOLING

(TXV UNITS)

FP2

VIO

FAN

24VAC

BRN

ORG

COMMON

ALARM

STATUS

RVS

LED

JW1

AL1

AL2

CO12

YEL

CXM

SEE NOTE 6 FOR

DRY ALARM CONTACT

MICROPROCESSOR

CONTROL LOGIC

SEE

NOTE 6

ALARM

RELAY

24V

EH1

EH2

SEE NOTE 8

POWER

DISTRIBUTION

BLOCK

G/Y

START ASSIST

WHEN NEEDED

(

)

EARTH (GRD)

RED*

RED

BLU*

BLU

POWER SUPPLY

REFER TO

DATA PLATE

USE COPPER

CONDUCTORS

ONLY

CAP

YEL

RED

BLK

N (NEUTRAL)

RED

COMPRESSOR

BLK

YEL

BR1

YEL

SEE NOTE 3

BR2

BLK

BLU

RED

TRANS

YEL OR WHT

BMC

NO COM

BLK

RED

BR1

24V

BLU

(

)

220V

BRN

BR2

YEL

ORG

240V

BRN

SIZES: 006, 009, 012

RED

SEE

NOTE 7

SEE

NOTE 7

BR1

FAN ENABLE

TYPICAL HEAT

PUMP T-STAT

SEE NOTE 5

RC S

COM2 COM1

RELAY

COM

O/W2 4

GRY

COMPR.

FAN

SPEED

RELAY

COM

COOLING

BR2

FAN

24VAC

COMMON

ALARM

DXM

HWTS

BLK*

MICROPROCESSOR

CONTROL LOGIC

BLK*

GRY

AL1

RED

SEE

NOTE 6

RED

BLU

LOC

SEE NOTE 4

FP1 (TXV UNITS)

ALARM

RELAY

AL2

NSB

ESD

OVR

LOC

FP1

FP2

JW4

DRY

SEE NOTE 6 FOR

DRY CONTACT

FOR ALARM

STATUS

GRY

VIO

AL2

TEST

FAULT

VIO

(CAP TUBE

UNITS) OR

FP2

RV RELAY

BRN

ORG

COMPONENT LOCATION

TEST

PINS

YEL

CO 12

JW3

SEE

LOW

24V

BR2

BR1

FP1

JW2

FP2

JW1

NOTE 4

LOW

N.O.

EH1

NO1

NC1

COM

NO2

NC2

COM

ACC1

RELAY

EH2

BRN*

OFFON

PM: DISABLE/ENABLE

CCG

ACC1

FUNCTIONS

UNIT STAGE: 2/1

BRN

YEL

ACC2

RELAY

T’STAT: HEAT COOL/HEAT PUMP

COMPR

RELAY

MV*

4 RV ON B/RV ON 0

ACC2

FUNCTIONS

DEHUMID/NORMAL

NOT USED

H: HI FAN/DEHUMID

NOT USED

RED*

BOILERLESS: ENABLE/DISABLE

BOILERLESS: 40°F/50°F

DIP SWITCH PACKAGE

SIZES: 015-060

LEGEND

— Alarm Relay Contacts

— Blower Motor

— Field Wiring Terminal Block

— Power Block

Thermistor

BMC — Blower Motor Capacitor

PSC

RVS

— Performance Monitor

— Permanent Split Capacitor

— Reversing Valve Solenoid

Condensate Pan

LED

— Blower Relay

CAP — Compressor Capacitor

— Circuit Breaker

TRANS — Transformer Optional Wiring

Field Line Voltage Wiring

Field Low Voltage Wiring

Printed Circuit Trace

Solenoid Coil

— Sensor, Condensate Overflow

FP1

FP2

— Sensor, Water Coil Freeze Protection

— Sensor, Air Coil Freeze Protection

Relay Contacts — N.O.

Temperature Switch

Switch — Loss of Charge

Ground

GND — Ground

— High-Pressure Switch

Optional Wiring

HWTS — High (Leaving) Water Temp Switch

— Clippable Field Selection Jumper

Relay/Contactor Coil

LOC — Loss of Charge Pressure Switch

MV — Motorized Valve

Wire Nut

*Optional wiring.

NOTES:

1. Compressor thermally protected internally.

2. All wiring to the unit must comply with NEC and local codes.

3. Transformer is wired to 240 v (ORG) lead for 240/50/1 units,

switch RED and ORG leads to PB(1) and insulate ORG lead for

220/50/1.

6. 24-v alarm signal shown. For dry alarm contact, cut JW4 jumper,

and dry contact will be available between AL1 and AL2.

7. Transformer secondary ground via microprocessor board stand-

offs and screws to control box. (Ground available from top two

standoffs as shown.)

8. Blower motor is factory wired for medium and high speeds. For

any other combination of speeds, at the motor attach black wire

4. FP1 thermistor provides freeze protection for water. When using

antifreeze solutions, cut JW3 jumper.

5. Check installation wiring information for specific thermostat

hookup. Refer to thermostat installation instructions for wiring to

the unit. Thermostat wiring must be “Class 1” and voltage rating

equal to or greater than unit supply voltage.

G/Y

COMPONENT LOCATION

LUG

G/Y

EARTH (GND)

N (NEUTRAL)

GROUND

LUG

POWER SUPPLY

REFER TO

DATA PLATE

USE COPPER

CONDUCTORS

ONLY

BLK

COMPR.

BR1

BLK

BR2

BR1

BR2

YEL

BLK

BLU

RED

YEL OR

WHT

YEL

24V

BMC

BRN

RED

(220V)

TRANS

BLU

SEE NOTE 8

ORG

(240V)

BRN

RED

SEE

NOTE 7

SEE

NOTE 7

BR1

FAN ENABLE

RELAY

COM

TYPICAL HEAT

PUMP T-STAT

SEE NOTE 5

R C S

COM2 COM1

GRY

COMPR.

FAN

SPEED

COM

COOLING

FAN

RELAY

BR2

O/W2 4

DXM

24VAC

MICROPROCESSOR

CONTROL LOGIC

HWTS

BLK*

GRY

BLK*

COMMON

ALARM

RED

BLU

BRN

GRY

SEE

NOTE 6

AL1

ALARM

RELAY

LOC

SEE NOTE 6 FOR

DRY CONTACT

FOR ALARM

JW4

DRY

SEE NOTE 4

FP1

AL2

TEST

STATUS

AL2

FP1

FP2

TXV

UNITS

VIO

CAP TUBE

UNIT

NSB

FAULT

FP2

BRN

ORG

RELAY

ESD

OVR

TEST

PINS

YEL

CO12

JW3

FP1

SEE

NOTE 4

LOW

N.O.

24V

JW2

FP2

JW1

EH1

NO1

NC1

COM

NO2

NC2

COM

ACC1

EH2

RELAY

OFFON

CCG

PM: DISABLE/ENABLE

BRN

YEL

ACC1

UNIT STAGE: 2/1

COMPR

RELAY

ACC2

FUNCTIONS

T’STAT: HEAT COOL/HEAT PUMP

RELAY

4 RV ON B/RV ON 0

ACC2

FUNCTIONS

DEHUMID/NORMAL

NOT USED

H: HI FAN/DEHUMID

NOT USED

BOILERLESS: ENABLE/DISABLE

BOILERLESS: 40°F/50°F

DIP SWITCH PACKAGE

LEGEND

—

Alarm Relay Contacts

Blower Motor

—

Performance Monitor

Circuit Breaker

LED

PSC

RVS

Permanent Split Capacitor

Reversing Valve Solenoid

Transformer Optional Wiring

BMC

Blower Motor Capacitor

Blower Relay

TRANS

CAP

Compressor Capacitor

Circuit Breaker

Sensor, Condensate Overflow

Field Line Voltage Wiring

Field Low Voltage Wiring

Printed Circuit Trace

Optional Wiring

Capacitor

Solenoid Coil

Relay Contacts — N.O.

Temperature Switch

Switch — Loss of Charge

Ground

FP1

FP2

GND

Sensor, Water Coil Freeze Protection

Sensor, Air Coil Freeze Protection

Ground

High-Pressure Switch

Relay/Contactor Coil

HWTS

High (Leaving) Water Temp Switch

Clippable Field Selection Jumper

Loss of Charge Pressure Switch

Motorized Valve

LOC

Thermistor

Field Wiring Terminal Block

Power Block

Condensate Pan

Wire Nut

*Optional wiring.

NOTES:

1. Compressor thermally protected internally.

2. All wiring to the unit must comply with NEC and local codes.

3. Neutral of 380/415-3-50 is required. Transformer is wired to 240-v (ORG)

lead for 415/3/50. For 380/3/50 switch ORG and (RED) leads at PB(3) and

insulate ORG lead. Transformer uses separate circuit breaker.

4. FP1 thermistor provides freeze protection for water. When using antifreeze

solutions, cut JW3 jumper.

5. Check installation wiring information for specific thermostat hookup. Refer

to thermostat installation instructions for wiring to the unit. Thermostat

wiring must be “Class 1” and voltage rating equal to or greater than unit

supply voltage.

6. 24-v alarm signal shown. For dry alarm contact, cut JW4 jumper, and dry

contact will be available between AL1 and AL2.

7. Transformer secondary ground via microprocessor board standoffs and

screws to control box. (Ground available from top two standoffs as shown.)

8. Blower motor is factory wired for medium and high speeds. For any other

combination of speeds, at the motor attach black wire to the higher of the

two desired speed taps, and the blue wire to the lower of the two desired

speed taps.

9. Blower motor is factory wired for high and low speeds. No other combina-

tion of speeds is available.

Fig. 12 — Typical Aquazone™ Deluxe D Control Wiring (3-Phase Unit)

Table 3 — Electrical Data

COMPRESSOR

FAN

MOTOR

FLA

TOTAL

UNIT

FLA

MIN

CIRCUIT

AMP

50RHE

UNIT

VOLTS-PHASE

(50 Hz)

VOLTAGE

MIN/MAX

MAX

FUSE/HACR

RLA

LRA

006

009

012

015

019

024

220/240-1

380-415-3

220/240-1

380-415-3

197/254

342/462

197/254

342/462

2.3

2.7

3.9

4.2

6.8

8.2

9.1

3.3

11.5

4.2

5.5

5.9

8.2

15.0

18.8

22.2

27.0

45.0

51.0

54.0

25.0

83.0

32.0

34.5

42.0

61.8

0.4

0.7

0.9

1.6

1.7

1.0

2.7

1.7

1.8

2.5

2.7

3.7

3.2

4.5

5.6

5.9

7.1

8.6

10.5

12.6

13.6

5.2

10.4

11.2

4.3

030

036

17.2

5.9

20.8

6.9

042

048

060

6.0

7.1

7.5

8.9

9.9

11.8

LEGEND

FLA

— Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

LRA — Locked Rotor Amps

RLA — Rated Load Amps

POWER CONNECTION — Make line voltage connection

by connecting the incoming line voltage wires to the L side

of the CC terminal as shown in Fig. 13. See Table 3 for

correct wire and maximum overcurrent protection sizing.

SUPPLY VOLTAGE — Operating voltage to unit must be

within voltage range indicated on unit nameplate.

On 3-phase units, voltages under load between phases must

be balanced within 2%. Use the following formula to deter-

mine the percentage voltage imbalance:

Operation on improper line voltage or excessive phase

imbalance constitutes abuse and may cause damage to electri-

cal components.

NOTE: If more than 2% voltage imbalance is present, contact

local electric utility.

220-VOLT OPERATION — All 220-240 volt units are factory

wired for 208 volts. The transformers may be switched to

220-volt operation by switching the red (220 volt) wire with

the orange (240 volt) wire at the TB1-1 terminal for single-

phase and TB1-3 for 3-phase.

% Voltage Imbalance

max voltage deviation from average voltage

= 100 x

average voltage

Example: Supply voltage is 460-3-60.

AB = 452 volts

BC = 464 volts

AC = 455 volts

452 + 464 + 455

Average Voltage =

1371

457

Determine maximum deviation from average voltage:

(AB) 457 – 452 = 5 v

(BC) 464 – 457 = 7 v

(AC) 457 – 455 = 2 v

Maximum deviation is 7 v.

Determine percent voltage imbalance.

% Voltage Imbalance = 100 x

457

= 1.53%

This amount of phase imbalance is satisfactory as it is

below the maximum allowable 2%.

Fig. 13 — 50RHE Typical Single-Phase Line

Voltage Power Connection

PSC (PERMANENT SPLIT CAPACITOR) BLOWER SPEED

SELECTION — All Water Source Heat Pumps are factory set

to deliver rated airflow at nominal static (37 Pa) on medium

speed. Where higher static is needed, high speed can be

utilized (100 to 125 Pa). Low speed will deliver approximately

85% of rated airflow (25 Pa). The PSC blower fan speed can

be changed on all units by swapping wires connected to the

relay contacts that control the fan. See Table 4 and Fig. 14.

CONNECT THE BLUE WIRE TO:

H FOR HIGH SPEED FAN

M FOR MEDIUM SPEED FAN

L FOR LOW SPEED FAN

BLU

MEDIUM FACTORY SETTING

NOTE: Available airflow for all units is shown in Table 4.

FAN MOTOR

Fig. 14 — 50RHE Blower Speed Selection

Table 4 — 50RHE Blower Performance

AIRFLOW (L/s)

External Static Pressure (Pa)

NOMINAL

AIRFLOW

(L/s)

MINIMUM

AIRFLOW

(L/s)

50RHE

UNIT

FAN

SPEED

100

125

MED

133

110

165

160

151

170

165

146

345

321

293

326

302

293

396

387

368

529

510

458

614

580

505

123

112

—

109

—

330

326

297

373

349

—

435

—

464

455

446

113

140

212

264

307

349

437

530

630

006

009

012

015

019

024

030

036

042

048

—

151

146

137

165

151

137

316

302

278

311

288

269

368

359

340

496

477

439

576

543

472

691

593

463

142

127

123

151

142

127

288

274

255

283

260

245

335

326

311

463

448

406

519

488

429

629

539

421

118

113

109

137

127

118

250

241

222

250

227

217

302

297

278

425

415

378

463

434

387

566

485

—

123

118

104

198

189

179

203

189

179

260

255

231

378

368

340

415

392

349

501

429

—

104

160

198

231

264

326

396

472

MED

743

637

498

793

777

762

738

723

709

672

658

645

604

592

580

535

524

514

MED

—

896

818

748

—

757

710

690

796

747

683

668

623

612

755

707

653

552

529

516

710

658

618

High Static

048

630

472

595

787

748

797

866

803

731

833

779

709

790

060

LEGEND

NOTES:

1. Units factory shipped on medium speed. Other speeds require

field selection.

Shaded areas are below minimum CFM. This data is

provided for troubleshooting information only.

2. For dual voltage units, airflow is rated at lowest voltage.

3. Performance data shown is based n wet coil and clean air filter.

Step 9 — Low Voltage Wiring (See Fig. 15)

BR BRG CCG CC

THERMOSTAT CONNECTIONS — The thermostat should

be wired directly to the Aquazone™ control board. See

Fig. 9-12.

Comp

Relay

CLIP JW2-FP2

JUMPER FOR

ANTI-FREEZE

SYSTEMS

Off On

Test

FP1

FP2

WATER FREEZE PROTECTION — The Aquazone control

allows the field selection of source fluid freeze protection points

through jumpers. The factory setting of jumper JW3 (FP1) is set

for water at –1.1 C. In earth loop applications, jumper JW3

should be clipped to change the setting to –10.6 C when using

antifreeze in colder earth loop applications. See Fig. 16.

FP1 Low Temp

FP2 Low Temp

JW3

JW2

CLIP JW3

FOR

FREEZE

PROTECT

Micro

AIR COIL FREEZE PROTECTION — The air coil freeze

protection jumper JW2 (FP2) is factory set for –1.1 C and

should not need adjusting.

AL1

AL2

Status

LED

24Vdc

JW1-AL2 DRY

EH1

EH2

ACCESSORY CONNECTIONS — Terminal A on the control

is provided to control accessory devices such as water valves,

electronic air cleaners, humidifiers, etc. This signal operates

with the compressor terminal. See Fig. 17. Refer to the specific

unit wiring schematic for details.

Alarm

Relay

CLIP

FOR DRY

CONTACT

NOTE: The A terminal should only be used with 24-volt

signals — not line voltage signals.

AQUAZONE CONTROL (C Control Shown)

Fig. 16 — Typical Aquazone Control Board

Jumper Locations

WATER SOLENOID VALVES — Water solenoid valves may

be used on primary/secondary pump and ground water installa-

tions. A typical well water control valve wiring approach,

which can limit waste water in a lockout condition, is shown in

Fig. 17. A slow closing valve may be required to prevent water

hammer. When using a slow closing valve, consider special

wiring conditions. The valve takes approximately 60 seconds

to open (very little water will flow before 45 seconds) and it

activates the compressor only after the valve is completely

opened by closing its end switch. When wired as shown, the

valve will have the following operating characteristics:

Terminal Strip P2

Typical

Water

Valve

24 VAC

1. Remain open during a lockout

2. Draw approximately 25 to 35 VA through the “Y” signal

of the thermostat.

Fig. 17 — Typical D Control Accessory Wiring

IMPORTANT: Connecting a water solenoid valve can

overheat the anticipators of electromechanical thermo-

stats. Only use relay based electronic thermostats.

PRE-START-UP

System Checkout — When the installation is complete,

follow the System Checkout procedure outlined below before

starting up the system. Be sure:

1. Voltage is within the utilization range specifications of the

unit compressor and fan motor and voltage is balanced

for 3-phase units.

2. Fuses, breakers and wire are correct size.

3. Low voltage wiring is complete.

4. Piping and system flushing is complete.

5. Air is purged from closed loop system.

6. System is balanced as required. Monitor if necessary.

7. Isolation valves are open.

8. Water control valves or loop pumps are wired.

9. Condensate line is open and correctly pitched.

10. Transformer switched to lower voltage tap if necessary.

11. Blower rotates freely — shipping support is removed.

12. Blower speed is on correct setting.

13. Air filter is clean and in position.

14. Service/access panels are in place.

15. Return air temperature is between 4.4 to 26.7 C heating

and 10 to 43.3 C cooling.

16. Air coil is clean.

17. Control field selected settings are correct.

NOTE: Low voltage connector may be removed for easy installation.

Fig. 15 — Low Voltage Field Wiring

AIR COIL — To obtain maximum performance, clean the air

coil before starting the unit. A ten percent solution of dish-

washing detergent and water is recommended for both sides of

the coil. Rinse thoroughly with water.

D Control DIP Switches — The D Control has 2 DIP

switch blocks. Each DIP switch block has 8 switches and is

labeled either S1 or S2 on the circuit board. See Fig. 11 and 12.

DIP SWITCH BLOCK 1 (S1) — This set of switches offers

the following options for D Control configuration:

Performance Monitor (PM) — Set switch 1 to enable or dis-

able performance monitor. To enable the PM, set the switch to

ON. To disable the PM, set the switch to OFF.

Compressor Relay Staging Operation — Switch 2 will en-

able or disable compressor relay staging operation. The com-

pressor relay can be set to turn on with stage 1 or stage 2 call

from the thermostat. This setting is used with dual stage units

(units with 2 compressors and 2 D controls) or in master/slave

applications. In master/slave applications, each compressor and

FIELD SELECTABLE INPUTS

Jumpers and DIP (dual in-line package) switches on the

control board are used to customize unit operation and can be

configured in the field.

C Control Jumper Settings (See Fig. 9 and 10)

WATER COIL FREEZE PROTECTION (FP1) LIMIT

SETTING — Select jumper 3, (JW3-FP1 Low Temp) to

choose FP1 limit of –12.2 C or –1.1 C. To select –1.1 C as the

limit, DO NOT clip the jumper. To select –12.2 C as the limit,

clip the jumper.

AIR COIL FREEZE PROTECTION (FP2) LIMIT SET-

TING — Select jumper 2 (JW2-FP2 Low Temp) to choose

FP2 limit of –12.2 C or –1.1 C. To select –1.1 C as the limit,

DO NOT clip the jumper. To select –12.2 C as the limit, clip

the jumper.

ALARM RELAY SETTING — Select jumper 1 (JW1-AL2

Dry) for connecting alarm relay terminal (AL2) to 24 vac (R) or

to remain as a dry contact (no connection). To connect AL2 to

R, do not clip the jumper. To set as dry contact, clip the jumper.

C Control DIP Switches — The C Control has 1 DIP

switch block with five switches. See Fig. 9 and 10.

PERFORMANCE MONITOR (PM) — DIP switch 1 will

enable or disable this feature. To enable the PM, set the switch

to ON. To disable the PM, set the switch to OFF.

STAGE 2 — DIP switch 2 will enable or disable compressor

delay. Set DIP switch to OFF for stage 2 in which the compres-

sor will have a 3-second delay before energizing.

SWITCHES 3 AND 4 — Not used.

1 OR 3 TRIES — DIP switch 5 provides selection of whether

there are 1 or 3 tries for FP1 and FP2. This only applies to FP1

and FP2, and not to any other faults. Set DIP switch 5 to ON

for 1 try or to OFF for 3 tries.

NOTE: The alarm relay will not cycle during Test mode if

switch is set to OFF, stage 2.

D Control Jumper Settings (See Fig. 11 and 12)

WATER COIL FREEZE PROTECTION (FP1) LIMIT

SETTING — Select jumper 3, (JW3-FP1 Low Temp) to

choose FP1 limit of –12.2 C or –1.1 C. To select –1.1 C as the

limit, DO NOT clip the jumper. To select –12.2 C as the limit,

clip the jumper.

AIR COIL FREEZE PROTECTION (FP2) LIMIT SET-

TING — Select jumper 2 (JW2-FP2 Low Temp) to choose

FP2 limit of –12.2 C or –1.1 C. To select –1.1 C as the limit,

DO NOT clip the jumper. To select –12.2 C as the limit, clip

the jumper.

ALARM RELAY SETTING — Select jumper 4 (JW4-AL2

Dry) for connecting alarm relay terminal (AL2) to 24 vac (R) or

to remain as a dry contact (no connection). To connect AL2 to

R, do not clip the jumper. To set as dry contact, clip the jumper.

LOW PRESSURE SETTING — The D Control can be con-

figured for Low Pressure Setting (LP). Select jumper 1

(JW1-LP Norm Open) for choosing between low pressure

input normally opened or closed. To configure for normally

closed operation, do not clip the jumper. To configure for

normally open operation, clip the jumper.

Table 5 — DIP Switch Block S2 —

Accessory 1 Relay Options

LEGEND

NOTE: All other DIP switch combinations are invalid.

Table 6 — DIP Switch Block S2 —

Accessory 2 Relay Options

LEGEND

NOTE: All other switch combinations are invalid.

Auto Dehumidification Mode or High Fan Mode — Switch 7

provides selection of auto dehumidification fan mode or high

fan mode. In auto dehumidification fan mode the fan speed

relay will remain off during cooling stage 2 if terminal H is

active. In high fan mode, the fan enable and fan speed relays

will turn on when terminal H is active. Set the switch to ON for

auto dehumidification fan mode or to OFF for high fan mode.

Switch 8 — Not used.

D Control Accessory Relay Configurations —

The following accessory relay settings are applicable for both

D controls only:

Scroll Compressor Rotation — It is important to be

certain compressor is rotating in the proper direction. To

determine whether or not compressor is rotating in the proper

direction:

Unit Start-Up Heating Mode

NOTE: Operate the unit in heating cycle after checking the

cooling cycle. Allow five minutes between tests for the pres-

1. Connect service gages to suction and discharge pressure

fittings.

2. Energize the compressor.

3. The suction pressure should drop and the discharge

pressure should rise, as is normal on any start-up.

If the suction pressure does not drop and the discharge

pressure does not rise to normal levels:

1. Turn off power to the unit. Install disconnect tag.

2. Reverse any two of the unit power leads.

3. Reapply power to the unit and verify pressures are correct.

The suction and discharge pressure levels should now move

to their normal start-up levels.

When the compressor is rotating in the wrong direction, the

unit makes more noise and does not provide cooling.

After a few minutes of reverse operation, the scroll com-

pressor internal overload protection will open, thus activating

the unit lockout. This requires a manual reset. To reset, turn the

thermostat on and then off.

NOTE: There is a 5-minute time delay before the compressor

will start.

Unit Start-Up Cooling Mode

1. Adjust the unit thermostat to the warmest position.

Slowly reduce the thermostat position until the compres-

sor activates.

2. Check for cool air delivery at unit grille a few minutes

after the unit has begun to operate.

3. Verify that the compressor is on and that the water flow

rate is correct by measuring pressure drop through the

heat exchanger using P/T plugs. See Table 8. Check the

elevation and cleanliness of the condensate lines; any

dripping could be a sign of a blocked line. Be sure the

condensate trap includes a water seal.

4. Check the temperature of both supply and discharge wa-

ter. Compare to Table 9. If temperature is within range,

proceed. If temperature is outside the range, check the

cooling refrigerant pressures in Table 9.

5. Check air temperature drop across the coil when com-

pressor is operating. Air temperature drop should be

between 8.3 and 13.9.

Table 8 — Water Temperature Change

Through Heat Exchanger

Table 9 — Typical Unit Operating Pressures and Temperatures

COOLING

HEATING

ENTERING

WATER

TEMP (C)

(EWT)

WATER

FLOW

(l/s per kW)

Suction Discharge Super-

Sub-

Water Temp Air Temp Suction Discharge Super- Sub-

Air

Water Temp

Drop (C) DB

Pressure Pressure

heat cooling

Rise

(C)

Drop (C) Pressure Pressure

heat cooling

Temp

(kPa)

(C)

(kPa)

(C)

Rise (C)

0.027

0.041

0.054

225-254

222-251

219-248

269-314

239-284

209-254

14-22

7-11

6-10

6- 9

12-13

7- 9

3- 6

12-14

102-117

111-129

120-138

499-556

514-571

529-586

7- 9

1-2

4-5

3-4

2-3

8-11

9-12

–1

0.027

0.041

0.054

225-254

222-251

219-248

374-463

359-425

344-413

7-11

6-10

5- 9

4- 8

11-13

7- 8

4- 7

11-14

150-179

158-185

164-194

538-628

553-643

568-658

6- 9

1-3

6-7

4-5

3-4

13-16

13-17

14-17

0.027

0.041

0.054

225-254

222-251

219-248

535-592

502-556

472-523

5- 9

4- 8

4- 7

11-12

7- 9

4- 7

11-13

212-245

218-254

227-263

613-688

628-712

643-724

8-11

1-3

8-9

5-6

3-4

16-19

17-21

0.027

0.041

0.054

225-254

222-251

219-248

685-750

652-721

622-688

5- 9

4- 8

4- 7

10-12

6- 8

3- 6

9-13

254-284

269-299

284-314

658-777

673-792

688-807

10-16

1-3

8-9

6-7

4-5

18-22

18-23

19-23

0.027

0.041

0.054

231-260

228-257

225-254

837-957

807-927

777-897

4- 8

6-14

6-13

6-12

9-11

5- 7

3- 6

8-11

LEGEND

Dry Bulb

Entering Air Temperature

NOTES:

1. Based on nominal 54 L/s per kW airflow and 21° C EAT heating and 26.7/

194° C EAT cooling.

EAT

—

2. Cooling air and water numbers can vary greatly with changes in humidity.

3. Subcooling is based upon the head pressure at compressor service port.

Table 10 — 50RHE Coaxial Water Pressure Drop

3. Maintain a fluid level in the tank above the return tee to

avoid air entering back into the fluid.

4. Shutting off the return valve that connects into the flush

cart reservoir will allow 345 kPa surges to help purge air

pockets. This maintains the pump at 345 kPa.

5. To purge, keep the pump at 345 kPa until maximum

pumping pressure is reached.

6. Open the return valve to send a pressure surge through

the loop to purge any air pockets in the piping system.

7. A noticeable drop in fluid level will be seen in the flush

cart tank. This is the only indication of air in the loop.

NOTE: If air is purged from the system while using a 254 mm

PVC flush tank, the level drop will only be 25 to 51 mm since

liquids are incompressible. If the level drops more than this,

flushing should continue since air is still being compressed in

the loop. If level is less than 25 to 51 mm, reverse the flow.

8. Repeat this procedure until all air is purged.

9. Restore power.

Antifreeze may be added before, during or after the flushing

process. However, depending on when it is added in the

process, it can be wasted. Refer to the Antifreeze section for

more detail.

PRESSURE DROP (kPa)

UNIT

50RHE

L/S

0° C

10° C

20° C

30° C

0.047

0.071

0.095

6.0

8.4

5.4

7.8

5.1

7.2

4.8

6.9

006

009

012

015

019

024

030

036

042

048

060

14.1

13.2

12.0

11.7

0.071

0.107

0.139

8.1

12.0

23.9

7.5

11.1

22.4

6.9

10.5

20.9

6.6

9.9

20.0

0.095

0.145

0.189

19.1

41.3

66.1

17.9

38.9

61.9

16.7

36.2

57.7

16.1

34.7

55.0

0.114

0.164

0.221

16.7

32.6

55.9

15.5

30.5

52.3

14.7

28.7

48.7

14.1

27.2

46.3

0.142

0.215

0.284

12.9

23.0

45.4

12.0

21.5

42.5

11.1

20.3

39.8

10.8

19.1

37.7

0.189

0.284

0.379

13.8

28.7

47.8

12.6

26.9

44.9

11.7

25.1

41.9

11.4

23.9

39.8

0.237

0.347

0.473

9.9

17.0

26.9

9.0

15.8

25.4

8.4

14.7

23.6

8.1

14.1

22.4

0.284

0.426

0.568

7.8

15.0

23.9

7.2

13.8

22.4

6.9

12.9

20.9

6.6

12.3

20.0

0.331

0.498

0.663

9.9

19.7

31.1

9.3

18.5

29.3

8.7

17.0

27.5

8.4

16.4

26.0

Loop static pressure will fluctuate with the seasons. Pres-

sures will be higher in the winter months than during the warm-

er months. This fluctuation is normal and should be considered

when charging the system initially. Run the unit in either heat-

ing or cooling for several minutes to condition the loop to a

homogenous temperature.

0.379

0.568

0.757

14.1

26.9

44.0

13.2

25.4

41.0

12.3

23.6

38.3

11.7

22.4

36.5

0.473

0.713

0.947

33.5

58.3

88.5

31.4

54.4

82.8

29.3

50.8

77.1

27.8

48.4

73.3

When complete, perform a final flush and pressurize the

loop to a static pressure of 275 to 345 kPa for winter months or

105 to 135 kPa for summer months.

After pressurization, be sure to remove the plug from the

end of the loop pump motor(s) to allow trapped air to be

discharged and to ensure the motor housing has been flooded.

Be sure the loop flow center provides adequate flow through

the unit by checking pressure drop across the heat exchanger.

Compare the results to the data in Table 10.

Flushing — Once the piping is complete, units require final

purging and loop charging. A flush cart pump of at least 1.5 hp

(1.12 kW) is needed to achieve adequate flow velocity in

the loop to purge air and dirt particles from the loop. Flush the

loop in both directions with a high volume of water at a high

velocity. Follow the steps below to properly flush the loop:

1. Verify power is off.

2. Fill loop with water from hose through flush cart before

using flush cart pump to ensure an even fill. Do not allow

the water level in the flush cart tank to drop below the

pump inlet line to prevent air from filling the line.

Antifreeze — In areas where entering loop temperatures

drop below 4.4 C or where piping will be routed through areas

subject to freezing, antifreeze is needed.

Alcohols and glycols are commonly used as antifreeze

agents. Freeze protection should be maintained to 8.3 K below

the lowest expected entering loop temperature. For example, if

the lowest expected entering loop temperature is –1.1 C, the

leaving loop temperature would be –5.6 to –3.9 C. Therefore, the

freeze protection should be at –9.4 C (–1.1 C –8.3 C = –9.4 C).

Calculate the total volume of fluid in the piping system. See

Table 11. Use the percentage by volume in Table 12 to deter-

mine the amount of antifreeze to use. Antifreeze concentration

should be checked from a well mixed sample using a hydrome-

ter to measure specific gravity.

FREEZE PROTECTION SELECTION — The –1.1 C FP1

factory setting (water) should be used to avoid freeze damage

to the unit.

Once antifreeze is selected, the JW3 jumper (FP1) should

be clipped on the control to select the low temperature (anti-

freeze 13 F) set point to avoid nuisance faults.

Table 11 — Approximate Fluid Volume (L)

per 30 m of Pipe

LEGEND

NOTE: Volume of heat exchanger is approximately 3.78 liters.

Table 12 — Antifreeze Percentages by Volume

Cooling Tower/Boiler Systems — These systems typ-

ically use a common loop temperature maintained at 15.6 to

32.2 C. Carrier recommends using a closed circuit evaporative

cooling tower with a secondary heat exchanger between the

tower and the water loop. If an open type cooling tower is used

continuously, chemical treatment and filtering will be necessary.

The optional cupronickel heat exchanger must also be used in

this case.

Ground Coupled, Closed Loop and Plateframe

Heat Exchanger Well Systems —

Output EH2 will be off if FP1 is greater than 7.2 C and FP2

(when shorted) is greater than 43.3 C during Heating Stage 3

mode. This condition will have a 30-second recognition time.

Also, during Heating Stage 3 mode, EH1, EH2, Fan Enable,

and Fan Speed will be ON if G input is not active.

EMERGENCY HEAT — In Emergency Heat mode, the Fan

Enable and Fan Speed relays are turned on. The EH1 output is

turned on immediately. With continuing Emergency Heat de-

mand, EH2 will turn on after 5 minutes. Fan Enable and Fan

Speed relays are turned off after a 60-second delay. The control

reverts to Standby mode.

Table 13 — C Control Current LED Status

and Alarm Relay Operations

LED STATUS

DESCRIPTION OF OPERATION

ALARM RELAY

Normal Mode

Open

Cycle

(closed 5 sec.,

Open 25 sec.)

Normal Mode with

PM Warning

Off

Slow Flash

Fast Flash

C Control is non-functional

Fault Retry

Open

Closed

Lockout

Open

(Closed after

15 minutes)

Slow Flash

Over/Under Voltage Shutdown

Flashing Code 1 Test Mode — No fault in memory

Flashing Code 2 Test Mode — HP Fault in memory

Flashing Code 3 Test Mode — LP Fault in memory

Flashing Code 4 Test Mode — FP1 Fault in memory

Flashing Code 5 Test Mode — FP2 Fault in memory

Flashing Code 6 Test Mode — CO Fault in memory

Cycling Code 1

Cycling Code 2

Cycling Code 3

Cycling Code 4

Cycling Code 5

Cycling Code 6

Output EH1, EH2, Fan Enable, and Fan Speed will be ON if

the G input is not active during Emergency Heat mode.

COOLING STAGE 1 — In Cooling Stage 1 mode, the Fan

Enable, compressor and RV relays are turned on immediately.

If configured as stage 2 (DIP switch set to OFF) then the com-

pressor and fan will not turn on until there is a stage 2 demand.

The fan Enable and compressor relays are turned off immedi-

ately when the Cooling Stage 1 demand is removed. The con-

trol reverts to Standby mode. The RV relay remains on until

there is a heating demand. If there is a master/slave or dual

compressor application, all compressor relays and related func-

tions will track with their associated DIP switch 2 on S1.

COOLING STAGE 2 — In Cooling Stage 2 mode, the Fan

Enable, compressor and RV relays remain on. The Fan Speed

relay is turned on immediately and turned off immediately

once the Cooling Stage 2 demand is removed. The control re-

verts to Cooling Stage 1 mode. If there is a master/slave or dual

compressor application, all compressor relays and related func-

tions will track with their associated DIP switch 2 on S1.

Test Mode — Over/Under

shutdown in memory

Flashing Code 7

Cycling Code 7

Cycling Code 8

Cycling Code 9

Flashing Code 8

Flashing Code 9

Test Mode — PM in memory

Test Mode — FP1/FP2

Swapped Fault in memory

LEGEND

—

Condensate Overflow

Freeze Protection

High Pressure

LED — Light-Emitting Diode

—

Low Pressure

Performance Monitor

NOTES:

1. Slow flash is 1 flash every 2 seconds.

2. Fast flash is 2 flashes every 1 second.

3. EXAMPLE: “Flashing Code 2” is represented by 2 fast flashes followed by

a 10-second pause. This sequence will repeat continually until the fault is

cleared.

NIGHT LOW LIMIT (NLL) STAGED HEATING — In NLL

staged Heating mode, the override (OVR) input becomes ac-

tive and is recognized as a call for heating and the control will

immediately go into a Heating Stage 1 mode. With an addition-

al 30 minutes of NLL demand, the control will go into Heating

Stage 2 mode. With another additional 30 minutes of NLL

demand, the control will go into Heating Stage 3 mode.

Table 14 — C Control LED Code and

Fault Descriptions

LED

FAULT

DESCRIPTION

CODE

No fault in memory

There has been no fault since

the last power-down to power-up

sequence

High-Pressure Switch

Low-Pressure Switch

HP Open Instantly

LP open for 30 continuous sec-

onds before or during a call

(bypassed for first 60 seconds)

SYSTEM TEST

Freeze Protection Coax

— FP1

FP1 below Temp limit for 30 con-

tinuous seconds (bypassed for

first 60 seconds of operation)

FP2 below Temp limit for 30 con-

tinuous seconds (bypassed for

first 60 seconds of operation)

System testing provides the ability to check the control

operation. The control enters a 20-minute Test mode by

momentarily shorting the test pins (see Fig. 9-12). All time

delays are reduced by a factor of 15.

Freeze Protection Air Coil

— FP2

Condensate overflow

Over/Under Voltage

Sense overflow (grounded) for

30 continuous seconds

"R" power supply is <19VAC or

>30VAC

Performance Monitor Warning

has occurred.

Test Mode — To enter Test mode on C or D controls, cycle

the power 3 times within 60 seconds. The LED (light-emitting

diode) will flash a code representing the last fault when enter-

ing the Test mode. The alarm relay will also power on and off

during Test mode. See Tables 13 and 14. To exit Test mode,

short the terminals for 3 seconds or cycle the power 3 times

within 60 seconds.

(Autoreset) Shutdown

PM Warning

FP1 and FP2 Thermistors FP1 temperature is higher than

are swapped

FP2 in heating/test mode, or FP2

temperature is higher than FP1

in cooling/test mode.

NOTE: Deluxe D Control has a flashing code and alarm relay

cycling code that will both have the same numerical label.

For example, flashing code 1 will have an alarm relay cycling

code 1. Code 1 indicates the control has not faulted since the

last power off to power on sequence.

LEGEND

—

Freeze Protection

High Pressure

LED — Light-Emitting Diode

—

Low Pressure

Performance Monitor

Retry Mode — In Retry mode, the status LED will start to

flash slowly to signal that the control is trying to recover from

an input fault. The control will stage off the outputs and try to

again satisfy the thermostat used to terminal Y. Once the ther-

mostat input calls are satisfied, the control will continue normal

operation.

NOTE: If 3 consecutive faults occur without satisfying the

thermostat input call to terminal Y, the control will go into

lockout mode. The last fault causing the lockout is stored in

memory and can be viewed by entering Test mode.

IMPORTANT: All refrigerant discharged from this unit

must be recovered without exception. Technicians must fol-

low industry accepted guidelines and all local, state and fed-

eral statutes for the recovery and disposal of refrigerants.

IMPORTANT: To avoid the release of refrigerant into the

atmosphere, the refrigerant circuit of this unit must only be

serviced by technicians which meet local, state and federal

proficiency requirements.

Aquazone™ Deluxe D Control LED Indica-

IMPORTANT: To prevent injury or death due to electrical

shock or contact with moving parts, open unit disconnect

switch before servicing unit.

tors — There are 3 LED indicators on the D Control:

STATUS LED — Status LED indicates the current status or

mode of the D control. The Status LED light is green.

Filters — Filters must be clean for maximum performance.

Inspect filters every month under normal operating conditions.

replace when necessary.

TEST LED — Test LED will be activated any time the D

control is in test mode. The Test LED light is yellow.

FAULT LED — Fault LED light is red. The fault LED will

always flash a code representing the last fault in memory. If

there is no fault in memory, the fault LED will flash code 1 on

the and appear as 1 fast flash alternating with a 10-second

pause. See Table 15.

IMPORTANT: Units should never be operated with-

out a filter.

Water Coil — Keep all air out of the water coil. Check

open loop systems to be sure the well head is not allowing air

to infiltrate the water line. Always keep lines airtight.

Inspect heat exchangers regularly, and clean more frequent-

ly if the unit is located in a “dirty” environment. Keep the heat

exchanger full of water at all times. Open loop systems should

have an inverted P trap placed in the discharge line to keep

water in the heat exchanger during off cycles. Closed loop

systems must have a minimum of 105 kPa during the summer

and 275 kPa during the winter.

SERVICE

Perform the procedures outlined below periodically, as

indicated.

IMPORTANT: When a compressor is removed from this

unit, system refrigerant circuit oil will remain in the com-

pressor. To avoid leakage of compressor oil, the refrigerant

lines of the compressor must be sealed after it is removed.

Check P trap frequently for proper operation.

Table 15 — Aquazone™ D Control Current LED Status and Alarm Relay Operations

STATUS LED

(Green)

TEST LED

(Yellow)

DESCRIPTION

Normal Mode

FAULT LED (Red)

Flash Last Fault Code in Memory

Flashing Code 8

ALARM RELAY

Off

Open

Cycle (closed 5 sec,

open 25 sec, …)

Normal Mode with PM

Off

D Control is non-functional

Test Mode

Off

—

Off

—

Off

Open

Flash Last Fault Code in Memory

Flashing Code 1

Cycling Appropriate Code

Night Setback

ESD

Invalid T-stat Inputs

No Fault in Memory

HP Fault

Flashing Code 2

Flashing Code 3

Flashing Code 4

—

Open

Slow Flash

Fast Flash

Flashing Code 2

Flashing Code 3

Flashing Code 4

Flashing Code 5

Flashing Code 6

Flashing Code 7

Flashing Code 2

Flashing Code 3

LP Fault

FP1 Fault

FP2 Fault

CO Fault

Open

Over/Under Voltage

HP Lockout

Open (closed after 15 minutes)

Closed

LP Lockout

FP1 Lockout

FP2 Lockout

CO Lockout

Flashing Code 4

Flashing Code 5

Flashing Code 6

LEGEND

NOTES:

1. If there is no fault in memory, the Fault LED will flash code 1.

2. Codes will be displayed with a 10-second Fault LED pause.

3. Slow flash is 1 flash every 2 seconds.

CO — Condensate Overflow

ESD — Emergency Shutdown

FP — Freeze Protection

HP — High Pressure

LP — Low Pressure

PM — Performance Monitor

4. Fast flash is 2 flashes every 1 second.

5. EXAMPLE: “Flashing Code 2” is represented by 2 fast flashes

followed by a 10-second pause. This sequence will repeat contin-

ually until the fault is cleared.

Condensate Drain Pans — Check condensate drain

pans for algae growth twice a year. If algae growth is apparent,

consult a water treatment specialist for proper chemical treat-

ment. Applying an algaecide every three months will typically

eliminate algae problems in most locations.

Refrigerant System — Verify air and water flow rates

are at proper levels before servicing. To maintain sealed circuit-

ry integrity, do not install service gauges unless unit operation

appears abnormal.

Check to see that unit is within the superheat and subcool-

ing temperature ranges shown in Table 16. If the unit is not

within these ranges, recover and reweigh in refrigerant charge.

Condensate Drain Cleaning — Clean the drain line

and unit drain pan at the start of each cooling season. Check

flow by pouring water into drain. Be sure trap is filled to main-

tain an air seal.

Air Coil Cleaning — Remove dirt and debris from evap-

orator coil as required by condition of the coil. Clean coil with

a stiff brush, vacuum cleaner, or compressed air. Use a fin

comb of the correct tooth spacing when straightening mashed

or bent coil fins.

Condenser Cleaning — Water-cooled condensers may

require cleaning of scale (water deposits) due to improperly

maintained closed-loop water systems. Sludge build-up may

need to be cleaned in an open water tower system due to

induced contaminants.

Local water conditions may cause excessive fouling or

pitting of tubes. Condenser tubes should therefore be cleaned at

least once a year, or more often if the water is contaminated.

Proper water treatment can minimize tube fouling and

pitting. If such conditions are anticipated, water treatment

analysis is recommended. Refer to the Carrier System Design

Manual, Part 5, for general water conditioning information.

Clean condensers with an inhibited hydrochloric acid solu-

tion. The acid can stain hands and clothing, damage concrete,

and, without inhibitor, damage steel. Cover surroundings to

guard against splashing. Vapors from vent pipe are not harmful,

but take care to prevent liquid from being carried over by the

gases.

Warm solution acts faster, but cold solution is just as effec-

tive if applied for a longer period.

GRAVITY FLOW METHOD — Do not add solution faster

than vent can exhaust the generated gases.

When condenser is full, allow solution to remain overnight,

then drain condenser and flush with clean water. Follow acid

5. Read liquid line temperature on thermometer; then

subtract from bubble point temperature. The difference

equals subcooling temperature.

motor on a high platform such as a step ladder. Do not

allow motor to hang by its power wires.

TROUBLESHOOTING

6. Compare the subcooling temperature with the normal

temperature listed in Table 9. If the measured liquid line

temperature does not agree with the required liquid line

temperature, ADD refrigerant to raise the temperature or

REMOVE refrigerant (using standard practices) to lower

the temperature (allow a tolerance of 1.7° C).

(Fig. 20 and 21, and Table 16)

When troubleshooting problems with a WSHP, consider the

following.

Thermistor — A thermistor may be required for single-

phase units where starting the unit is a problem due to low

voltage. See Fig. 20 for thermistor nominal resistance.

Refrigerant Charging

Control Sensors — The control system employs 2 nom-

inal 10,000 ohm thermistors (FP1 and FP2) that are used for

freeze protection. Be sure FP1 is located in the discharge fluid

and FP2 is located in the air discharge. See Fig. 21.

To prevent personal injury, wear safety glasses and gloves

when handling refrigerant. Do not overcharge system —

this can cause compressor flooding.

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

0.0

NOTE: Do not vent or depressurize unit refrigerant to atmo-

sphere. Remove and reclaim refrigerant following accepted

practices.

Air Coil Fan Motor Removal

Before attempting to remove fan motors or motor mounts,

place a piece of plywood over evaporator coils to prevent

coil damage.

Disconnect motor power wires from motor terminals before

motor is removed from unit.

1. Shut off unit main power supply.

0.0

20.0

40.0

60.0

80.0 100.0 120.0 140.0

2. Loosen bolts on mounting bracket so that fan belt can be

removed.

Temperature (degF)

3. Loosen and remove the 2 motor mounting bracket bolts

on left side of bracket.

Fig. 20 — Thermistor Nominal Resistance

4. Slide motor/bracket assembly to extreme right and lift out

through space between fan scroll and side frame. Rest

AIR

COIL

SUCTION

AIRFLOW

(°F)

AIRFLOW

(°F)

COMPRESSOR

THERMISTOR

EXPANSION

VALVE

COAX

DISCHARGE

FP2

FP1

CONDENSATE

OVERFLOW

(CO)

LIQUID

LINE

WATER IN

WATER OUT

AIR COIL

WATER

COIL

PROTECTION

FREEZE

PROTECTION

LEGEND

COAX — Coaxial Heat Exchanger

Airflow

Refrigerant Liquid Line Flow

Fig. 21 — FP1 and FP2 Thermistor Location

Table 16 — Troubleshooting

FAULT

HEATING COOLING

POSSIBLE CAUSE

SOLUTION

Main Power Problems

Green Status LED Off

Check line voltage circuit breaker and disconnect.

Check for line voltage between L1 and L2 on the contactor.

Check for 24 vac between R and C on controller.

Check primary/secondary voltage on transformer.

HP Fault — Code 2

High Pressure

Reduced or no water flow in Check pump operation or valve operation/setting.

cooling

Check water flow adjust to proper flow rate.

Water temperature out of

range in cooling

Bring water temperature within design parameters.

Reduced or no airflow in

heating

Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

Dirty air coil — construction dust etc.

External static too high. Check Table 4.

Air temperature out of range Bring return air temperature within design parameters.

in heating

Overcharged with refrigerant Check superheat/subcooling vs typical operating condition Table 9.

Bad HP switch

Insufficient charge

Check switch continuity and operation. Replace.

Check for refrigerant leaks.

LP/LOC Fault — Code 3

Low Pressure/Loss of

Charge

Compressor pump down at Check charge and start-up water flow.

start-up

FP1 Fault — Code 4

Water Freeze Protection

Reduced or no water flow in Check pump operation or water valve operation/setting.

heating

Plugged strainer or filter. Clean or replace.

Check water flow adjust to proper flow rate.

Inadequate antifreeze level Check antifreeze density with hydrometer.

Improper freeze protect set- Clip JW2 jumper for antifreeze (–12.2 C) use.

ting (–1.1 C vs –12.2 C)

Water temperature out of

range

Bring water temperature within design parameters.

Bad thermistor

Reduced or no airflow in

cooling

Check temperature and impedance correlation.

Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check Table 4.

FP2 Fault — Code 5

Air Coil Freeze

Protection

Air temperature out of range Too much cold vent air. Bring entering air temperature within design

parameters.

Improper freeze protect set- Normal airside applications will require –1.1 C only.

ting (–1.1 C vs –12.2 C)

Bad thermistor

Blocked drain

Improper trap

Poor drainage

Check temperature and impedance correlation.

Check for blockage and clean drain.

Check trap dimensions and location ahead of vent.

Check for piping slope away from unit.

Condensate Fault —

Code 6

Check slope of unit toward outlet.

Poor venting. Check vent location.

Moisture on sensor

Under voltage

Check for moisture shorting to air coil.

Over/Under Voltage —

Code 7

(Auto Resetting)

Check power supply and 24 vac voltage before and during operation.

Check power supply wire size.

Check compressor starting.

Check 24 vac and unit transformer tap for correct power supply voltage.

Check power supply voltage and 24 vac before and during operation.

Check 24 vac and unit transformer tap for correct power supply voltage.

Over voltage

Performance Monitor —

Code 8

Heating mode FP2> 51.7 C Check for poor airflow or overcharged unit.

Cooling mode FP1> 51.7 C Check for poor water flow or airflow.

OR FP2< 4.4 C

FP1 and FP2

Thermistors —

Code 9

FP1 temperature is higher

than FP2 temperature.

FP2 temperature is higher

than FP1 temperature.

Swap FP1 and FP2 thermistors.

No Fault Code Shown

Unit Short Cycles

No compressor operation

Compressor overload

Control board

See scroll compressor rotation section.

Check and replace if necessary.

Reset power and check operation.

Dirty air filter

Unit in 'Test Mode'

Unit selection

Compressor overload

Thermostat position

Unit locked out

Check and clean air filter.

Reset power or wait 20 minutes for auto exit.

Unit may be oversized for space. Check sizing for actual load of space.

Check and replace if necessary.

Only Fan Runs

Ensure thermostat set for heating or cooling operation.

Check for lockout codes. Reset power.

Check compressor overload. Replace if necessary.

Compressor overload

LEGEND

RV — Reversing Valve

Table 16 — Troubleshooting (cont)

FAULT

HEATING COOLING

POSSIBLE CAUSE

SOLUTION

Only Compressor Runs

Thermostat wiring

Fan motor relay

Check G wiring at heat pump. Jumper G and R for fan operation.

Jumper G and R for fan operation. Check for line voltage across BR

contacts.

Check fan power enable relay operation (if present).

Check for line voltage at motor. Check capacitor.

Fan motor

Thermostat wiring

Check Y and W wiring at heat pump. Jumper Y and R for compressor

operation in Test mode.

Unit Does Not Operate in

Cooling

Reversing valve

Set for cooling demand and check 24 vac on RV coil and at control.

If RV is stuck, run high pressure up by reducing water flow and while

operating, engage and disengage RV coil voltage to push valve.

Thermostat setup

Thermostat wiring

Dirty filter

Check for 'O' RV setup not 'B'.

Check O wiring at heat pump. Jumper O and R for RV coil 'Click'.

Replace or clean.

Insufficient Capacity/

Not Cooling or Heating

Properly

Reduced or no airflow in

heating

Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check blower Table 4.

Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check blower Table 4.

Reduced or no airflow in

cooling

Leaky ductwork

Check supply and return air temperatures at the unit and at distant duct

registers if significantly different, duct leaks are present.

Low refrigerant charge

Restricted metering device Check superheat and subcooling Table 9. Replace.

Check superheat and subcooling Table 9.

Defective reversing valve

Thermostat improperly

located

Perform RV touch test.

Check location and for air drafts behind thermostat.

Unit undersized

Recheck loads and sizing check sensible cooling load and heat pump

capacity.

Perform scaling check and clean if necessary.

Scaling in water heat

exchanger

Inlet water too hot or cold

Check load, loop sizing, loop backfill, ground moisture.

Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check blower Table 4.

High Head Pressure

Reduced or no airflow in

heating

Reduced or no water flow in Check pump operation or valve operation/setting.

cooling

Check water flow; adjust to proper flow rate. See Table 8.

Inlet water too hot

Check load, loop sizing, loop backfill, ground moisture.

Air temperature out of range Bring return air temperature within design parameters.

in heating

Scaling in water heat

exchanger

Perform scaling check and clean if necessary.

Unit overcharged

Check superheat and subcooling. Reweigh in charge.

Vacuum system and reweigh in charge.

Non-condensables in

system

Restricted metering device Check superheat and subcooling per Table 9. Replace.

Low Suction Pressure

Reduced water flow in

heating

Check pump operation or water valve operation/setting.

Plugged strainer or filter. Clean or replace.

Check water flow adjust to proper flow rate.

Water temperature out of

range

Bring water temperature within design parameters.

Reduced airflow in cooling Check for dirty air filter and clean or replace.

Check fan motor operation and airflow restrictions.

External static too high. Check blower Table 4.

Air temperature out of range Too much cold vent air. Bring entering air temperature within design

parameters.

Insufficient charge

Too high airflow

Poor performance

Too high airflow

Unit oversized

Check for refrigerant leaks.

Check blower Table 4.

See 'Insufficient Capacity'.

Check blower Table 4.

Recheck loads and sizing check sensible cooling load and heat pump

capacity.

Low Discharge Air

Temperature in Heating

High Humidity

LEGEND

RV — Reversing Valve

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 005-00042 Printed in U.S.A. Form 50RHE-C1SI Pg 30 2-04 Replaces: New

Book 1

Tab 5a 5a

50RHE R-407C UNIT

START-UP CHECKLIST

CUSTOMER:___________________________

MODEL NO.:___________________________

JOB NAME: _______________________________________

SERIAL NO.:____________________

DATE:_________

I. PRE-START-UP

DOES THE UNIT VOLTAGE CORRESPOND WITH THE SUPPLY VOLTAGE AVAILABLE? (Y/N)

HAVE THE POWER AND CONTROL WIRING CONNECTIONS BEEN MADE AND TERMINALS

TIGHT? (Y/N)

HAVE WATER CONNECTIONS BEEN MADE AND IS FLUID AVAILABLE AT HEAT EXCHANGER?

(Y/N)

HAS PUMP BEEN TURNED ON AND ARE ISOLATION VALVES OPEN? (Y/N)

HAS CONDENSATE CONNECTION BEEN MADE AND IS A TRAP INSTALLED? (Y/N)

IS AN AIR FILTER INSTALLED? (Y/N)

II. START-UP

CL-1

HEATING CYCLE ANALYSIS

kPa

°C

DEW

POINT

AIR

COIL

SUCTION

°C

COMPRESSOR

DISCHARGE

EXPANSION

VALVE

COAX

°C

LIQUID LINE

°C

kPa

WATER IN

°C

kPa

WATER OUT

LOOK UP PRESSURE DROP IN TABLE 10

TO DETERMINE FLOW RATE

COOLING CYCLE ANALYSIS

kPa

°C

DEW

POINT

AIR

COIL

SUCTION

°C

COMPRESSOR

DISCHARGE

EXPANSION

VALVE

COAX

°C

LIQUID LINE

°C

kPa

WATER IN

°C

kPa

WATER OUT

LOOK UP PRESSURE DROP IN TABLE 10

TO DETERMINE FLOW RATE

HEAT OF EXTRACTION (ABSORPTION) OR HEAT OF REJECTION =

FLOW RATE (L/S) x TEMP. DIFF. (DEG. C) x

FLUID FACTOR* =

(kW)

SUPERHEAT = SUCTION TEMPERATURE – SUCTION DEW POINT TEMPERATURE

(DEG C)

SUBCOOLING = DISCHARGE BUBBLE POINT TEMPERATURE – LIQUID LINE TEMPERATURE

(DEG C)

*Use 4.16 for water, 4.03 for antifreeze.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book

Tab

Catalog No. 005-00042

Printed in U.S.A.

Form 50RHE-C1SI

Pg CL-2

2-04

Replaces: New

5a 5a

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