®

RHE**A2*

REMOTE HEAT PUMPS

Installation Instructions

Table of Contents

ATTENTION INSTALLING PERSONNEL ..................... 1

Safety Guidelines ......................................................... 2

General ........................................................................... 2

SHIPPING AND HANDLING ..................................................... 2

LOCATION AND CLEARANCES .............................................

ROOFTOP INSTALLATION .....................................................

APPLICATION NOTE ...............................................................

2

2

2

Refrigerant Piping ......................................................... 3

REFRIGERANT LINE SIZING .................................................

ROUTING REFRIGERANT LINES ..........................................

3

3

FILTER DRIER INSTALLATION ...............................................

SWEAT CONNECTIONS .........................................................

3

3

Safe Refrigerant Handling ........................................... 3

LEAK TESTING ........................................................................

SYSTEM EVACUATION ...........................................................

4

4

Electrical Connections ................................................. 5

System Startup ............................................................. 6

PRELIMINARY CHARGE ADJUSTMENT ...............................

FINAL CHARGE ADJUSTMENT .............................................

6

6

TROUBLESHOOTING .............................................................

7

Defrost System ............................................................. 7

GENERAL ................................................................................

TIME AND TEMPERATURE DEFROST CONTROL ...............

DEMAND DEFROST CONTROL .............................................

7

7

8

System Checklist .......................................................... 9

Thermostat Connections ........................................... 10

!

RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION.

ATTENTION INSTALLING PERSONNEL

As a professional installer you have an obligation to know the product better than the customer. This includes all safety precautions and related items.

Prior to actual installation, thoroughly familiarize yourself with this Instruction Manual. Pay special attention to all safety warnings. Often during installation or repair it is possible to place yourself in a position which is more hazardous than when the unit is in operation.

Remember, it is your responsibility to install the product safely and to know it well enough to be able to instruct a customer in its safe use.

Safety is a matter of common sense...a matter of thinking before acting. Most dealers have a list of specific good safety practices...follow them.

The precautions listed in this Installation Manual should not supersede existing practices but should be considered as supplemental information.

June 1999 (2)

Amana

Fayetteville, TN 37334

10845803

!

SAFETY GUIDELINES

1. Allow only qualified, experienced technicians to install or service this unit.

2. Install the system in accordance with all local codes. If no local codes exist, follow National Codes (NEC in the U.S., CEC in Canada).

3. Open the electrical disconnect switch before electrically connecting the unit.

4. Before operating the unit, be certain it is properly grounded.

5. The unit contains refrigerant gas under pressure.

Avoid puncturing or breaking any tubing.

6. Before operating the unit, complete the refrigerant connections.

General

5'

MINIMUM CLEARANCES

12"

12"

6"

This manual covers only the installation of the remote heat pump. For information on accessories, see the unit

“Specification Sheet”.

SHIPPING AND HANDLING

Check the unit for any shipping damage. If damage is found, contact the company where you purchased the unit.

If no damage is found, carefully remove all shipping material, and properly dispose of it.

Keep the unit as upright as possible. Laying the unit on its side or top could cause equipment damage.

LOCATION AND CLEARANCES

This unit is for outdoor installation only. Refer to Figure 1 for clearances from the sides of the unit to full walls and other objects.

NOTE: This unit cannot be completely enclosed. At least one side must be unrestricted.

Minimum clearances are required to avoid air recirculation and keep the unit operating at peak efficiency. A minimum six inch clearance is required on one side of the unit, and a minimum of twelve on two other sides. The remaining side of the unit must be unrestricted. Ensure that there is at least five feet clearance above the unit. These minimum clearances do not guarantee adequate service access.

Sufficient clearances for servicing the unit(s) must be provided.

If installing two or more units at the same location, allow at least 24 inches between the units when using the 6”-12”-

12” guidelines in Figure 1. The space between two units may be reduced to 12” if the clearances in Figure 1 are increased to 12”-24”-24”.

SIDE VIEW

Figure 1

DO NOT locate the unit:

— Directly under a vent termination for a gas appliance.

— Within 3 feet of a clothes drier vent.

— Where the refreezing of defrost water would create a hazard.

— Where water may rise into the unit.

DO locate the unit:

— With the bottom of the unit at least three inches above the maximum expected snow accumulation level.

— In accordance with the minimum clearances described above.

— To minimize the length of refrigerant piping required.

— To provide adequate service clearances.

— On a level concrete pad (or other sturdy, weather resistant platform).

— Isolated from the building structure to avoidt r a n s mission of vibrations.

In general, short runs of refrigerant piping are better than long runs. Fifty feet is the longest line set allowed with

Amana split system heat pumps.

Locate the unit to provide safe access for future maintenance and service. If possible, discuss unit location with the owner before proceeding.

ROOFTOP INSTALLATIONS ONLY

Place the unit on a level, weather resistant platform. Be sure the roof will support the weight of the unit and platform. For approximate unit weight, see the “Specifications Sheet”. If in doubt about the adequacy of the roof, it is your responsibility to contact a qualified architect or structural engineer before installing the unit.

APPLICATION NOTE

For proper performance, the indoor equipment and ductwork must be adequate for moving about 400 CFM of indoor air for every ton of cooling capacity to be installed.

If they are not, modify the ductwork or indoor equipment accordingly.

2

Refrigerant Piping

sizes used. If mix matching to a restrictor orifice indoor coil, check the “Specification Sheet” for the proper orifice size to be used with this outdoor unit.

REFRIGERANT LINE SIZING

See unit “Specification Sheet” for required line sizes.

Using smaller vapor lines may decrease performance .

These sizes are suitable for line lengths of fifty feet or less.

It also assumes that the indoor coil will not be more than forty feet above or below the outdoor unit. Longer runs and greater lifts are not recommended. If a run of more than fifty feet is required, contact your Amana distributor for assistance.

Safe Refrigerant Handling

WARNING

To avoid possible explosion, death, or injury; practice safe handling of refrigerants.

ROUTING OF REFRIGERANT LINES

All of the vapor line must be insulated. The insulation must include a vapor barrier.

The liquid line must be outside of the vapor line’s insulation.

If part of the liquid line must run through an area that will be hotter than 120°F, then that portion of the liquid line must be insulated.

Avoid burying refrigerant lines. If you must bury them, first dig the trench so that it gradually slopes toward the compressor (at least 1 inch per 10 feet). Then, insulate the liquid and suction lines separately. Enclose all underground portions of the refrigerant lines in waterproof material (conduit or pipe). If the lines must pass under or through a concrete slab, be sure they are adequately protected.

Seal the holes where the refrigerant piping enters the building.

Be careful not to kink or dent the refrigerant lines. Kinked or dented lines will cause poor performance or compressor damage.

FILTER DRIER INSTALLATION

1. The filter drier shipped with the unit must be installed in the liquid line. Warranty may be void if filter dryer is not installed per these instructions.

2. The filter drier may be installed near the condensing unit or near the indoor coil.

While these items will not cover every conceivable situation, they should serve as a useful guide:

—Refrigerants are heavier than air. They can “push out”

the oxygen in your lungs or in any enclosed space. To avoid possible death or difficulty in breathing:

—Never sniff a refrigerant.

—Never purge refrigerant into an enclosed room or space. In fact, all refrigerants must, by law, be reclaimed.

—If an indoor leak is suspected, thoroughly ventilate the area before beginning work.

—Liquid refrigerant can be very cold. To avoid possible frostbite or blindness, avoid contact and wear gloves and goggles. If liquid refrigerant does contact your skin or eyes, get medical help immediately.

—Always follow EPA regulations. Never burn refrigerant, as poisonous gas will be produced.

—To avoid possible explosion, use refrigerant cylinders properly:

—If you must heat a cylinder for faster charging, partly immerse it in warm water. Never apply flame or steam to the cylinder.

—Store cylinders in a cool, dry place. Never use a cylinder as a platform or a roller.

—Never add anything other than R-22 to an R-22 cylinder.

—Never fill a cylinder more than 80% full of liquid refrigerant.

—When removing refrigerant from a system, use only returnable (not disposable) service cylinders. Check the cylinder for its pressure rating and hydrostatic test date. Check the cylinder for any damage which may lead to a leak or explosion. If in doubt, do not use the cylinder.

SWEAT CONNECTIONS AT THE UNIT

1. IMPORTANT: To avoid overheating of the service valve while brazing, wrap the valve body with a wet rag, or use a thermal heat trap compound as recommended by the compound manufacturer.

2. The ends of the refrigerant lines must be cut square, deburred, cleaned, and be round and free from nicks or dents. Any other condition increases the chance of a refrigerant leak.

3. After brazing, quench the joints with water or a wet cloth. This will also help prevent overheating of the service valve.

SWEAT CONNECTIONS AT THE INDOOR COIL

Check the indoor coil liquid and vapor line diameter. A bushing or coupling may be needed to match with the line

3

LEAK TESTING

WARNING

To avoid the risk of fire or explosion, never use oxygen, high pressure air or flammable gasses for leak testing of a refrigeration system.

1. Be sure both hand valves on the gauge manifold are closed relative to the center port (i.e., turned in all the

way.) Attach this gauge manifold to the service valves on the unit. Do not open the unit service valves. Do not use refrigerant from the unit for leak testing - it has been precisely measured at the factory for optimum performance.

WARNING

To avoid possible explosion, the line from the nitrogen cylinder must include a pressure regulator and a pressure relief valve. The pressure relief valve must be set to open at 175 psig or less.

2. Connect a cylinder of dry nitrogen to the center port on the gauge manifold.

3. Open the hand valve a minimal amount on the line coming from the nitrogen cylinder.

4. Open the high pressure valve on the gauge manifold.

Pressurize the refrigerant lines and the indoor coil to

150 psig (1034 kPA). To reach 150 psig, you may need to further open the hand valve on the nitrogen cylinder.

WARNING

To avoid possible explosion or equipment damage, do not exceed 150 psig when pressure testing.

After you reach 150 psig, close the valve on the nitrogen cylinder. Disconnect it from the gauge manifold. If you plan to use an electronic leak detector, add a trace of R-22 to the system (if permitted by current EPA regulations).

5. Put a soap solution on all connections and joints. If you see bubbles, you have a leak. Mark these locations.

6. Use the gauge manifold to carefully release the nitrogen from the system. If leaks were found, repair them.

After repair, repeat the above pressure test. If no leaks exist, proceed to system evacuation.

ID COIL AND LINE SETS EVACUATION

1. To speed nitrogen release, use a core puller to remove the valve cores from the service valves.

2. Connect the vacuum pump, high vacuum manifold set with high vacuum hoses, thermocouple vacuum gauge and charging cylinder as shown. Begin with all valves fully closed.

3. Your first step will be only to confirm proper pump and gauge operation. Open only the shutoff valve which leads to the vacuum pump (Figure 2)(C). Start the pump. After the gauge manifold (low side) reading drops to about 29 inches of vacuum, open only the valve to the thermocouple vacuum gauge(D). Evacuate until the gauge reads 250 microns or less.

4. Close the valve to the thermocouple vacuum gauge(D).

This will avoid potential gauge damage from “pegging the meter”. Now that proper pump and gauge operation has been confirmed, you are ready to begin the actual evacuation of the lines and indoor coil.

THERMOCOUPLE

VACUUM

GAUGE

DIAL-A-CHARGE

CHARGING CYLINDER

TO

RELATED

GAUGE

PORTS OF

COND. UNIT

LOW SIDE

GAUGE

HIGH SIDE

GAUGE

HIGH VACUUM

MANIFOLD

A

D

B

C

E LARGE DIAMETER

BRAIDED VACUUM

HOSES

F

A. HIGH SIDE VALVE

B. LOW SIDE VALVE

C. VACUUM PUMP

D. THERMOCOUPLE GAUGE

E. MANIFOLD GAUGE

F. CHARGING CYLINDER

HIGH VACUUM PUMP

Figure 2

5. Open the high and low side valves on the gauge manifold. Keep the valve on the charging cylinder itself closed, but open the valve on the gauge manifold that leads to the cylinder.

6. Evacuate the system to about 29 inches of vacuum as measured by the compound (low side) gauge.

7. Open the valve to the thermocouple vacuum gauge.

Evacuate until the gauge reads 250 microns or less.

8. Close the valve to the vacuum pump. Wait five minutes, then check the pressure on the thermocouple vacuum gauge: a. If the pressure is not more than 1500 microns, the system is leak-free and properly evacuated. Proceed to Step 9.

b. If the pressure rises, but holds at about 5000 microns, moisture and noncondensibles are still present. Open the valve to the vacuum pump, and go back to Step 7.

c. If the pressure rises above 5000 microns, a leak is present. Go back to “Leak Testing” section on page

4.

9. Close the valve to the thermocouple vacuum gauge.

Close the valve to the vacuum pump. Shut off the pump.

4

WARNING

To avoid personal injury, shock, or death, open the electrical disconnect switch before electrically connecting the unit.

Wiring must conform with NEC or CEC and all local codes.

The wiring diagram for this unit can be found on the control box cover. Refer to Figure 3 for field wiring connections.

START

CAPACITOR

(if present)

HIGH VOLTAGE

CONNECTIONS

GROUND LUG

Electrical Connections

E

O

W2

R

Y

C/X

LOW VOLTAGE

CONNECTIONS

LOW VOLTAGE ENTRANCE

HIGH VOLTAGE ENTRANCE

Figure 3

WARNING

START RELAY

(if present)

To avoid the risk of fire or equipment damage, use only copper conductors.

2. Route the power supply and ground wires through the high voltage entrance in the unit. Connect the power supply wires to the contactor. Connect the ground wire to the ground lug.

3. Route the low voltage wiring through the low voltage entrance in the unit. Connect the low voltage wires to the terminal strip.

4. If a proper room thermostat is not already present, install one at a suitable indoor location.

Room thermostats:

-Must have one stage of cooling.

-Must continuously energize the “O” terminal when in the “Cool” mode.

-Must not continuously energize the “O” terminal when in the “Auto” (automatic changeover) mode.

-Should have two stages of heat.

-Should have adjustable heat anticipator(s). For proper settings, see the blower coil or fossil fuel kit installation manual.

-Must automatically bypass compressor heat when in the “Emergency Heat” mode.

Consult the instructions packaged with the thermostat for mounting and location instructions. For field-supplied low voltage wiring and connections, see the last section of this manual.

5. IMPORTANT: Hard start components are required when single-phase reciprocating compressors are used with indoor coils which have thermal expansion valves. Some units have hard start components factory installed. See the “Specifications” sheet for hard start component requirements.

6. Check all factory wiring connections to ensure none were loosened during shipping and handling.

System Startup

WARNING

Consult the National Electrical Code or a qualified electrician for proper wire size.

Undersized wires could cause poor equipment performance, equipment damage, or fire.

1. Local codes will usually require that a disconnect switch be located near the unit. Do not locate the disconnect switch on the unit itself.

WARNING

To avoid electrical shock, injury, or death, wiring to the unit must be properly grounded.

PRELIMINARY CHARGE ADJUSTMENT

IMPORTANT: See the wiring diagram or “Specifications” sheet to determine if this unit has a crankcase heater. If it does, you must connect electrical power to the unit for four hours before operating the compressor. Failure to do so could result in compressor damage.

IMPORTANT: During all installation and service work, follow all regulations of the Environmental Protection

Agency. (This system uses R-22. R-22 is an HCFC [Hydrogenated Chlorofluorocarbon].) Violation of EPA regulations may result in fines or other penalties.

Use a male hexhead wrench to carefully open the suction and liquid valves on the unit. These valves do not back seat. OPEN EACH VALVE ONLY UNTIL IT TOUCHES

5

THE RETAINER. TO AVOID LOSS OF REFRIGERANT,

DO NOT APPLY PRESSURE TO THE RETAINER.

The outdoor unit is factory charged with enough R-22 for the matching indoor blower coil or matching A coil plus 25 feet of 3/8 inch liquid line. Add or subtract 0.60 oz. of R-22 per foot of 3/8" liquid line for any difference from 25 feet.

IMPORTANT: Use only refrigerant which is certified to meet ARI Standard 700. Used refrigerant may cause compressor damage, and will void the warranty. (Most portable machines cannot clean used refrigerant well enough to meet this ARI Standard.)

IMPORTANT: If adding additional refrigerant to a system, add only refrigerant vapor (not liquid) through the suction valve (low side) on the outdoor unit. Any other practice may cause compressor damage.

FINAL CHARGE ADJUSTMENT

(MATCHING SYSTEM—COOLING OPERATION)

IMPORTANT: Never operate the compressor with the suction valve closed to “test the compressor’s pumping efficiency”. In some cases, this can result in serious compressor damage and loss of warranty coverage.

If installing a non-matching system, the outdoor temperature must be 60°F or higher to perform the final charge adjustment.

If the outdoor temperature is 60°F or higher, set the room thermostat to COOL, fan switch to AUTO, and set the temperature control well below room temperature.

If the outdoor temperature is below 60°F and you are installing a matching system, set the room thermostat to

HEAT, fan switch to AUTO, and set the temperature control well above room temperature. Measure the low side pressure from the pressure tap provided. See Figure

4. Measure the high side pressure from the liquid line service valve.

LIQUID LINE

SERVICE VALVE

VAPOR LINE

SERVICE VALVE

LOW SIDE

PRESSURE TAP

Turn the electrical power on, and let the system run for several minutes. It will take some time for the refrigerant pressures to stabilize.

If you are using the “Matched Combination”, see the outdoor unit "Specification Sheet". Compare the operating pressures and outdoor unit amp draw to the numbers listed. If pressures and amp draw are too low, add charge.

If pressures and amp draw are too high, remove charge.

If you are not using the “Matched Combination” which is listed on the unit "Specification Sheet", check subcooling

(TEV coils) or superheat (cap tube or flowrator coils) as detailed below.

FIINAL CHARGE ADJUSTMENT

(NON-MATCHING SYSTEM—COOLING OPERATION)

EXPANSION VALVE INDOORS:

At stabilized cooling conditions and with an outdoor temperature of 60°F or higher, the system should have from

9°F to 13°F subcooling. For a proper subcooling reading, measure the refrigerant pressure and temperature at the outdoor unit liquid line service valve. If you have less than

9°F subcooling, add charge. If you have more than 13°F subcooling, remove charge.

32

30

28

26

36

34

18

16

14

12

10

8

6

4

24

22

20

ORIFICE OR CAP TUBE INDOORS:

For a proper superheat reading, measure the refrigerant pressure and temperature at the outdoor unit vapor line service valve. The superheat should be within 3°F of that shown on the chart below. If the superheat is more than 3

°F higher than shown on the chart, add charge. If the superheat is more than 3 °F lower than shown on the chart, remove charge.

DESIRED SUPERHEAT vs OUTDOOR TEMPERATURE

70° F Ind oo r

85° F Indo

90° F

In do or

80° F Indo

75° F Indo or or or

50 60 70 80 90

OUTDOOR TEMPERATURE

100 110 120

Figure 4

6

EXAMPLE: The low side pressure is 84 psi. The low side temperature is 80°F. The outdoor temperature is 95°F.

The indoor temperature is 85°F. By referring to a pressure temperature chart, you wil see that 84 psi equals a saturated temperature of 50°F. The superheat is 80 - 50 =

30°F. The chart shows a superheat of 20°F is ideal for these conditions. Since our superheat is 30 - 20 = 10°F higher than ideal, charge must be added.

If the system is performing properly, reinstall the service port caps and the valve bonnets. With the valve opened, the valve bonnet is the primary seal against refrigerant leaks. See the table below for the torque required for an effective seal on the valve bonnet (1/6 turn past finger tight).

Tubing Size

3/8

1/2, 5/8, 3/4

7/8. 1 1/8

Torque (Foot-Pounds)

10

14

16

After closing the valve bonnet, perform a final refrigerant leak test on the valves and sweat connections. Return the room thermostat to the desired settings.

TROUBLELSHOOTING

(QUALIFIED SERVICER ONLY)

When troubleshooting, the first step should always be to check for clean coils, clean filter(s), and proper airflow.

Indoor airflow should be 350 to 450 CFM per ton of cooling, based on the size of the outdoor unit. The most common way of establishing indoor airflow is heating temperature rise. Indoor airflow will then be (Heating output of equipment) / (1.1 x temp. rise). In other cases, measurement of external static pressure is helpful. For details, see the

Installation Manual for your indoor equipment.

If further information is needed, see the Remote Heat

Pump Service Manual.

Defrost System

GENERAL

Two types of defrost controls are used. To determine which is on your unit, see the “Specification Sheet” shipped with the unit.

Test

Terminals

T1=30

Minutes

T2=60

Minutes

T3=90

Minutes

Figure 5

TIME AND TEMPERATURE DEFROST CONTROL

OPERATION:Defrosting of the outdoor coil is determined by both coil temperature and compressor run time. The compressor run time is factory set at 90 minutes, and is field adjustable to 30 or 60 minutes. Adjust only as required by high outdoor humidity or other adverse conditions. If adjustment of the run time appears advisable:

WARNING

To avoid electrical shock or death, disconnect the power before changing the defrost time cycle.

1. Move the control wire pin from T3 (90 minutes) to T2

(60 minutes), or T1 (30 minutes).

2. Reconnect the electrical power.

The maximum defrost time is 10 minutes. Most defrost cycles are shorter.

7

SERVICING

When servicing, it may be necessary to rapidly advance the system through a defrost cycle. To do this:

WARNING

To avoid electrical shock or death, disconnect the electrical power.

1. If the outdoor coil temperature is above 30°F, place a jumper wire from R on the low voltage terminal strip to 24V on the defrost control.

2. Place a jumper wire from TST to TST on the defrost control.

3. Reconnect the electrical power.

4. Place the system into heating operation.

5. The defrost cycle is now 256 times faster than normal:

90 minute run time now equals 21 seconds, 1 minute defrost time now equals 2 to 3 seconds.

0

6. After servicing is completed, disconnect the power, then remove R-24V and TST-TST jumper wires, replace panels, reconnect the power.

DEMAND DEFROST CONTROL

Defrosting of the outdoor coil is determined by both coil temperature and the length of the last defrost cycle. The compressor run time between defrost periods is automatically adjusted with every defrost cycle (minimum of 30 minutes and maximum of 360 minutes).

WARNING

To avoid electrical shock or death, disconnect the electrical power.

When servicing, it may be necessary to rapidly advance the system through a defrost cycle. To do this:

1. If the outdoor coil temperature is above 30°F, place a jumper wire from R on the low voltage terminal strip to one of the sensor (SEN) pins on the defrost control board.

2. Place a jumper wire from TST to COM on the defrost control board.

3. Reconnect the electrical power.

4. Place the system into heating operation.

NOTE: The HOLD (HLD) terminal must also be energized by 24VAC to indicate compressor operation.

5. The defrost cycle is now 180 times faster than normal:

360 minute run time now equals 2 minutes, 30 minute run time now equals 10 seconds, 10.5 minute maximum defrost time now equals 3 to 4 seconds.

6. After servicing is completed, disconnect the power, then remove R-24V and TST-COM jumper wires, replace panels, reconnect the power. The next programmed run time will be 30 minutes, if defrost is terminated during the jumper test.

Figure 6

8

System Checklist

1 Does the condenser fan blade rotate freely, and is it tight on the shaft?

2

Does the refrigerant tubing flex freely and not touch another tube to cause rub through?

3 Are both indoor and outdoor sections level?

4 Are the units properly supported?

5 Is outdoor section properly located on concrete base or equivalent?

6

Are the refrigerant lines correctly installed according to the relative position of the outdoor and indoor sections?

7 Is the refrigerant tubing properly supported by isolation hangers?

8 Is the system completely free of refrigerant leaks?

9 Has the system been properly evacuated?

10 Does the system have the correct refrigerant charge?

11

Is the outdoor unit protected by the correct size time delay type fuses or breakers in the indoor power box?

12 Are the power supply wires to units the correct size?

13 Are all electrical connections tight?

14 Does the compressor sound normal?

15

Check the amperage on the indoor blower motor. Is it within the limits shown on the nameplate of the motor?

16 Are all access panels installed and secured?

17

Do controls function properly? Are manual reset switches in the reset position (high pressure cutouts, relays, etc.)?

18

Check the voltage with unit running. Does it check within the tolerance of 207 to

253V for 230V, or 198 to 228V? If using 208V power indoors, have you modified the transformer wiring as necessary?

19 Has the air flow across the indoor coil been checked and adjusted?

20

Has the air distribution system been balanced? Are all grilles, diffusers, and dampers properly adjusted and locked?

21 Has the system operated at least 30 minutes before leaving the job?

22 Does the owner understand the operation of the unit and the thermostat?

23 Does the owner know where the filters are located?

24 Does the owner know when and how the filter(s) should be cleaned or changed?

25 Have the registration cards been filled out and mailed?

26 Does the owner know whom to call for service?

27 Has the User's Guide been filled out and left with the owner?

9

THERMOSTAT* CONNECTIONS TO RH-HEAT PUMPS

WITH INDOOR BLOWER COIL

A) No Outdoor Thermostat - Electric Heat Supplied During Defrost

ROOM THERMOSTAT

(6 wires)

BHA BLOWER COIL

(5 wires)

RH OUTDOOR UNIT

R W1 Y W2 E G C/X O

(1) R (1)

Notes: (1) BHA-TB blowers may require additional wire(s) here. See BHA-TB wiring diagram for details.

RHxEH001

B) With Outdoor Thermostat - Electric Heat Supplied During Defrost

ATK Not Controlling 1st Group of Electric Heaters - 9.6 to 28.8 KW

ROOM THERMOSTAT (2)

(6 wires)

BHA BLOWER COIL

(5 wires)

RH OUTDOOR UNIT

R W1 Y W2 E G C/X O

(1) R (1) W2 GY42

(3)

G C/X

ATK05 RHxEH002

Notes: (1) BHA-TB blowers may require additional wire(s) here. See BHA-TB wiring diagram for details.

(2) “Emergency Heat” will stop the compressor, but it will not bypass the outdoor thermostat. Only the amount of heat controlled by W2 will be energized above the ATK setpoint.

(3) See notes on page 12 regarding connector, GY42 wire, and staging of electric heat.

* Approved Thermostats are: THSMEC1H2BA

THSMDC1H2BA

THSADC1H2BA

THSMDC1H3BA

THSADC1H3BA

THPMFC1H2BA

Thermostats shown with required connections only.

Thermostats may have other terminals not shown in diagrams.

WARNING

To avoid personal injury, shock or death, disconnect the electrical power before electrically connecting any equipment or changing any existing wiring.

10

COLOR CODE

1ST GROUP COLOR

2ND GROUP NUMBER

OR-ORANGE BK-BLACK

YL-YELLOW

VT-VIOLET

BR-BROWN

GN-GREEN

BU-BLUE

RD-RED

TN-TAN

GY-GRAY

THERMOSTAT* CONNECTIONS TO RH-HEAT PUMPS

WITH INDOOR BLOWER COIL

C) ATK Controlling ALL Electric Heat

Morning Warmup Could be Slow - 4.8 to 28.8KW

ROOM THERMOSTAT

(6 wires)

BHA BLOWER COIL

(5 wires)

RH OUTDOOR UNIT

(1) R (1)

RHxEH003 ATK05

Notes: (1) BHA-TB blowers may require additional wire(s) here. See BHA-TB wiring diagram for details.

* Approved Thermostats are: THSMEC1H2BA

THSMDC1H2BA

THSADC1H2BA

THSMDC1H3BA

THSADC1H3BA

THPMFC1H2BA

Thermostats shown with required connections only. Thermostats may have other terminals not shown in diagrams.

WARNING

To avoid personal injury, shock or death, disconnect the electrical power before electrically connecting any equipment or changing any existing wiring.

11

COLOR CODE

1ST GROUP COLOR

2ND GROUP NUMBER

OR-ORANGE BK-BLACK

YL-YELLOW

VT-VIOLET

BU-BLUE

RD-RED

BR-BROWN

GN-GREEN

TN-TAN

GY-GRAY

ELECTRIC HEAT STAGING USING GY42 AT BLOWER CONNECTOR

GY42

GY

41

GY41

W2

GY42

GY

41

GY41

W2

TERM. STRIP

As shipped, connector in blower coil is as shown above.

Heater

Kit

EHK05A

EHK07A

EHK10A

EHK15A

EHK20A

EHK25A

EHK30A

KW from

W2

4.8

4.8

4.8

4.8

9.6

14.4

19.2

KW from

GY42

0

2.4

4.8

9.6

9.6

9.6

9.6

Total

KW

4.8

7.2

9.6

14.4

19.2

24.0

28.8

Use Manual J or Right-J or equivalent to calculate the building heating and cooling loads at design conditions.

Select the system size (in tons) to meet the cooling load.

Add enough electric heat to meet the heating load. Use data from the unit “Specification Sheet” to plot a graph of system capacities and building load vs. outdoor temperature. Examine the graph and the table above. Set the outdoor thermostat accordingly.

EXAMPLE: A home in Nashville, TN needs three tons of cooling. Its heating load has been calculated as 40600

BTUH at 14°F outdoor temperature. An RHA36A2A and

BHA36FA002A will be used.

As the graph shows, 9.6KW (EHK10A) must be added to the BHA36 to meet the heating load. As the chart above shows, the EHK10A can be split, with 4.8KW from W2 and

4.8KW through the outdoor thermostat to GY42. The “Unit

+ 4.8KW” will just meet the “Bldg. Load” at an outdoor temperature of 20°F. It is usually desirable to provide a small amount of extra capacity. Therefore, for this installation, the outdoor thermostat ATK05 should be set at

25°F.

This example is for purposes of illustration only. Actual selection and application of equipment remains the sole responsibility of the installer.

TERM. STRIP

If an outdoor thermostat, not controlling the first group of electric heaters, is to be used:

1. Disconnect power.

2. Remove and save wire nut shown above.

3. Extend GY42 wire into the low voltage terminal area.

4. Connect the GY42 wire as shown on the wiring schematic for your system.

5. Wire nut and tape the unused GY41 wire to prevent shorts.

PRELIMINARY HEATING PERFORMANCE

RHA36A2A w/ BHA36F002A

80

70

60

50

+

+

40

30

+

+

+

+

20

10

0

10 30 50

OUTDOOR TEMP (°F)

+ UNIT + 4.8KW UNIT + 9.6KW

UNIT ALONE BLDG. LOAD

+

70

WARNING

To avoid personal injury, shock or death, disconnect the electrical power before electrically connecting any equipment or changing any existing wiring.

12

COLOR CODE

1ST GROUP COLOR

2ND GROUP NUMBER

OR-ORANGE BK-BLACK

YL-YELLOW

VT-VIOLET

BU-BLUE

RD-RED

BR-BROWN

GN-GREEN

TN-TAN

GY-GRAY