Amana RHA**B2A Series User manual

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.
Priortoactualinstallation,thoroughlyfamiliarizeyourself
withthisInstructionManual.Payspecialattentiontoall
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,itisyourresponsibilitytoinstalltheproduct
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.
TheprecautionslistedinthisInstallationManualshould
not supersede existing practices but should be
considered as supplemental information.
Amana
Fayetteville, TN 37334
RHA**B2A
REMOTE HEAT PUMPS Installation
Instructions
March 1998 (2) 10845804
A
higher standard of comfor
t
Heating ¡Air Conditioning®
Table of Contents
GENERAL......................................................................2
Shipping and Handling ..............................................................2
Location and Clearances ..........................................................2
Rooftop Installations Only .........................................................2
Application Note ........................................................................2
I. Refrigerant Piping.....................................................2
Refrigerant Line Sizing ..............................................................2
Routing of Refrigerant Lines .....................................................2
Filter Drier Installation ...............................................................3
Sweat Connections at the Unit .................................................3
Sweat Connections at the Indoor Coil ......................................3
II. Safe Refrigerant Handling.......................................3
Leak Testing ..............................................................................3
System Evacuation ...................................................................4
III. Electrical Connections ...........................................5
IV. System Start-up ......................................................5
Preliminary Charge Adjustment ................................................5
Final Charge Adjustment - Cooling Operation........................6
ID Coil with Expansion Valve:...................................................6
ID Coil with Orifice: ...................................................................6
Troubleshooting .........................................................................8
V. Defrost System......................................................... 8
Thermostat Connections .............................................9
System Checklist ........................................................12

2
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 de-
scribed 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 avoid trans-
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 mainte-
nance 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 “Specifi-
cation 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 duct-
work 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.
I. Refrigerant Piping
Refrigerant Line Sizing
Seeunit“SpecificationSheet” forrequiredlinesizes. Be
sure to use the correct size as using smaller vapor lines
candecreaseunitperformance. Thesesizesaresuitable
forlinelengthsoffiftyfeetorless. Italsoassumesthatthe
indoor coil will not be more than forty feet above or below
the outdoor unit. Longer runs and greater lifts are not
recommended.
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 insula-
tion.
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.
Avoidburyingrefrigerantlines. Ifyoumustburythem,first
dig the trench so that it gradually slopes toward the
compressor (at least 1 inch per 10 feet). Then, insulate
theliquidandsuctionlinesseparately. Encloseallunder-
SAFETY GUIDELINES
1. Allowonlyqualified,experiencedtechnicianstoinstall
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 electri-
cally 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
Thismanualcoversonlytheinstallationoftheremoteheat
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.
Keeptheunitasuprightaspossible. Layingtheunitonits
side or top could cause equipment damage.
Location and Clearances
Thisunitisforoutdoorinstallationonly. RefertoFigure 1
for clearances from the sides of the unit to full walls and
other objects. These clearances will help avoid air recir-
culation. If installing two or more units at the same
location, allow at least 24 inches between units.
24"
24" 18"
12"
18"
MINIMUM CLEARANCES
SIDE VIEW TOP VIEW
5'
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.

3
3
ground 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 compres-
sor damage.
Filter Drier Installation
1. A filter drier must always be installed with a new
outdoor unit for the compressor warranty to be in
effect.
2. Units are shipped with a bi-flow liquid line filter drier
anditmustbeinstalledintheliquidlineeithernearthe
outdoor unit or near the indoor coil.
3. A bi-flow filter drier equivalent to a Sporlan HPC-163-
S-HH is recommended for clean up after a compres-
sor burnout.
Sweat Connections at the Unit
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 recom-
mended by the compound manufacturer.
1. The ends of the refrigerant lines must be cut square,
deburred, cleaned, and be round and free from nicks
ordents. Anyotherconditionincreasesthechanceof
a refrigerant leak.
2. After brazing, quench the joints with water or a wet
cloth. This will also help prevent overheating of the
service valve.
3.Thepaint finishof afilterdriermustremain intactafter
brazing. Repaint or treat with rust preventative, if
paint is chipped or burned.
Sweat Connections at the Indoor Coil
Check the indoor coil liquid and vapor line diameter. A
bushingorcouplingmaybeneededtomatchthelinesizes
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.
II. Safe Refrigerant Handling
WARNING
To avoid possible explosion, death, or
injury; practice safe handling of
refrigerants.
While these items will not cover every conceivable situa-
tion, 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 venti-
late the area before beginning work.
– Liquid refrigerant can be very cold. To avoid
possiblefrostbite or blindness, avoid contact and
wear gloves and goggles. If liquid refrigerant
does contact your skin or eyes, get medical help
immediately.
– Always follow Environmental Protection Agency
(EPA) regulations. Never burn refrigerant, as
poisonous gas will be produced.
To avoid a possible explosion, use refrigerant cyl-
inders 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 cylin-
ders. Check the cylinder for its pressure rating
and hydrostatic test date. Check the cylinder for
any damage which may lead to a leak or explo-
sion. If in doubt, do not use the cylinder.
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.)Attachthisgaugemanifoldtotheservicevalves
on the unit. Do not open the unit service valves. Do
notuserefrigerantfromtheunitforleaktesting-ithas
been precisely measured at the factory for optimum
performance.

4
ABC
E
D
F
A. HIGH SIDE VALVE
B. LOW SIDE VALVE
C. VACUUM PUMP
D. THERMOCOUPLE GAUGE
E. MANIFOLD GAUGE
F. CHARGING CYLINDER
Figure 2
3. Toavoidpotentialgaugedamagedueto“peggingthe
meter”, close the valve to the thermocouple vacuum
gauge (D).
4. Openthe high side (A) and low(B)side valves on the
manifold gauge. Keeping the valve on the charging
cylinder closed (F), open the valve on the manifold
gauge (E) leading to the cylinder.
5. Evacuate the system to about 29 inches of vacuum
as measured by the manifold gauge (low side).
6. Open the valve to the thermocouple vacuum gauge
(D) and evacuate until the gauge reads 250 microns
or less.
7. Close the valve to the vacuum pump. Wait five
minutes, then check the pressure on the thermo-
couple vacuum gauge:
a. If the pressure is not more than 1500 microns, the
system is leak-free and properly evacuated. Pro-
ceed to Step 8.
b. If the pressure rises, but holds at about 5000
microns, moisture and noncondensables are still
present. Open the valve to the
vacuum pump, and go back to Step 6.
c. If the pressure rises above 5000 microns, a leak is
present. Repeat Section II, Leak Testing .
8. Close the valve to the thermocouple vacuum gauge.
Close the valve to the vacuum pump. Shut off the
pump.
WARNING
Toavoidpossibleexplosion,thelinefrom
the nitrogen cylinder must include a
pressure regulator and a pressure relief
valve. The pressure relief valve must be
set to open at no more than 150 psig.
2. Connectacylinderofdrynitrogentothecenterporton
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 manifold gauge.
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. Once150 psig has been reached, close the
valve on the nitrogen cylinder and disconnect it from
the manifold gauge.
WARNING
Toavoidpossibleexplosionorequipment
damage, do not exceed 150 psig when
pressure testing.
5. Place a soapy solution on all connections and joints
andcheck for bubbles. Ifbubblesare seen, youhave
a leak. Mark these locations.
NOTE: If you plan to use an electronic leak detector,
add a trace of R-22 to the system (if permitted by
current EPA regulations).
6. Using the manifold gauge, carefully release the nitro-
gen from the system. Check for leaks. If leaks are
found,repairthemandrepeatsteps1through6. Ifno
leaks are found, proceed to system evacuation.
System Evacuation
NOTE: Evacuate the indoor (ID) coil and line sets
prior to releasing charge from the outdoor (OD) unit
into the system.
1. Connect the vacuum pump, high vacuum manifold
set,thermocouple vacuum gaugeand charging cylin-
der as shown in Figure 2. Be sure all valves are fully
closed.
2. Confirmproperpumpandgaugeoperation. Openthe
shutoff valve leading to the vacuum pump (C). Start
the pump. When the gauge manifold (low side) read-
ing drops to about 29 inches of vacuum, open the
valve to the thermocouple vacuum gauge (D). Con-
tinueevacuationuntilthegaugereads250micronsor
less.

5
5
WARNING
To avoid personal injury, shock, or death,
be sure wiring to the unit is properly
grounded.
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.
2. Wiresizeisimportanttoensureproperunitoperation.
Wire size must be sufficient to carry the minimum
circuitampacitylistedontheunitserialdataplate. We
recommend sizing the wires to limit the voltage drop
to a maximum of 2% from the main breaker or fuse
panel to the outdoor unit. Use Table 1 as a guide for
wire gauge and length of run.
3. Routethepowersupplyandgroundwiresthroughthe
high voltage entrance in the unit. Connect the power
supply wires to the contactor. Connect the ground
wire to the ground lug.
4. Route the low voltage wiring through the low voltage
entrancein the unit. Connect thelowvoltage wires to
the terminal strip.
5. Ifan Amanaapprovedroom thermostatisnot already
present, install one at a suitable indoor location.
Consult the instructions packaged with the thermo-
stat for mounting and location instructions. For field-
supplied low voltage wiring and connections, see the
last section of this manual.
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 “Specification Sheet” for hard start component
requirements.
6. Check all factory wiring connections to ensure none
were loosened during shipping and handling.
IV. System Start-up
Preliminary Charge Adjustment
IMPORTANT: Ifthisunit hasacrankcaseheater(see the
wiringdiagramor“SpecificationSheet”shippedwithunit),
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 EPA. This system uses refrig-
erantR-22.R-22isanHCFC(HydroChloro-FluoroCarbon).
Itis a violationof EPA regulationstodischarge HCFC into
the atmosphere doing so may result in fines or other
penalties.
Aftercompletingsystempiping,leaktesting,andelectrical
connecting, use an allen wrench to carefully open the
suction and liquid valves on the unit. These valves do not
back seat.
III. Electrical Connections
(Refer to Table 1 on page 6)
WARNING
Toavoidpersonalinjury,shock,ordeath,
open the electrical disconnect switch
before electrically connecting the unit.
Wiring must conform with National
Electrical Code (NEC) or Canadian
ElectricalCode (CEC)and alllocalcodes.
The wiring diagram for this unit can be found on the
control box cover. Refer to Figure 3 for field wiring
connections.
START CAP
(if present)
START RELAY
(if present)
FIELD WIRING
HIGH VOLTAGE CONNECTION
FIELD WIRING
LOW VOLTAGE CONNECTION
GROUND LUG
W
Y
C
R
O
RUN CAP
DEFROST
BOARD
FHC
L2 L1
T1T2
CC
PS1
RV
DFS
Figure 3
WARNING
To avoid the risk of fire or equipment
damage, use only copper conductors.
CAUTION
Undersized wires can cause poor
equipment performance, equipment
damage,orfire. Consultthe NEC, CEC or
aqualifiedelectricianforproperwiresize.
NOTE: Local codes usually require that a disconnect
switch be located near the unit. Do not locate the
disconnect switch on the unit itself.

6
75 60 50 43 37 N/R N/R N/R N/R N/R N/R N/R N/R
118 95 79 68 59 53 47 N/R N/R N/R N/R N/R N/R
188 150 125 107 95 83 75 68 63 58 54 N/R N/R
301 241 201 172 150 134 120 109 100 93 86 80 75
471 376 314 269 235 209 188 171 157 145 134 125 118
N/R = NOT RECOMMENDED
Wire ampacity and voltage drop calculation based on copper conductors with 75 degree C insulation per
1996 National Electrical Code (NEC) Conductors in 86 degree F ambient.
See NEC for ampacity derating for higher ambients.
27.5 3012.5 15 17.5 20
MAXIMUM ALLOWABLE WIRE LENGTH IN FEET TO LIMIT VOLTAGE DROP TO 2%
10
MINIMUM CIRCUIT AMPACITY OF OUTDOOR UNIT (MCA)
4032.5 35 37.5
WIRE SIZE
(AWG) 22.5 25
6
14
12
10
8
TABLE 1
This table is provided as a guide only. Wire sizing may be regulated by local codes.
Local inspection is the final authority on wire sizing.
WARNING
To avoid personal injury or death, open
eachvalveonlyuntilittouchestheretainer.
To avoid loss of refrigerant, do not apply
pressure to the retainer.
The outdoor unit is factory charged with enough R-22 for
thematching indoor blower coil or matchingAcoil plus 25
feetof 3/8inch liquidline. Addorsubtract 0.60oz. ofR-22
per foot of 3/8" liquid line for any difference from 25 feet.
For line sets over 50 feet consult an Amana distributor.
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 refrigerant to a system, add only
refrigerantvapor(notliquid)throughthesuctionvalve(low
side) on the outdoor unit. Any other practice may cause
compressor damage.
Final Charge Adjustment - Cooling Operation
Final charge adjustment must be performed when the
outdoor temperature is 60°F or higher:
1. Set the room thermostat to “COOL”.
2. Set the fan switch to “AUTO”.
3. Set the temperature control well below room temper-
ature.
4. Turn the power on.
5. Let the system run for 15 - 20 minutes, or until
pressures are stabilized.
6. Measure the high side pressure from the liquid line
service valve port.
7. Measure the low side pressure from vapor line ser-
vice valve port (for superheat value at outdoor unit).
LIQUID LINE
SERVICE VALVE VAPOR LINE
SERVICE VALVE
LOW SIDE
GAUGE PORT
Figure 4
ID Coil with Expansion Valve:
At stabilized cooling conditions and with an outdoor tem-
perature of 60°F or higher, the system should have from
9°F to 13°F subcooling 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.
ID Coil with Orifice:
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 on page 8. If the superheat is higher,
add charge. If the superheat is lower, remove charge.

7
7
4
50
60
70
80
90
100
110
120
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
SUPERHEAT @ O.D. UNIT
OUTDOOR TEMPERATURE
DESIRED SUPERHEAT vs OUTDOOR TEMPERATURE
90° F Indoor
70° F Indoor
75° F Indoor
80° F Indoor
85° F Indoor

8
EXAMPLE: The low side pressure is 84 psi. The low side
temperature is 80°F. The outdoor temperature is 95°F.
Theindoortemperatureis85°F.Byreferringtoapressure
temperature chart, you will 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.
Operating pressures and current draw can also be com-
pared with the data given in the “Specification Sheet”. 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 Torque (Foot-Pounds)
3/8 10
1/2, 5/8, 3/4 14
7/8. 1 1/8 16
After closing the valve bonnet, perform a final refrigerant
leakteston thevalvesandsweatconnections. Returnthe
room thermostat to the desired settings.
Troubleshooting
(Qualified Service Technician 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 equip-
ment.
If further information is needed, see the Remote Heat
Pump Service Manual.
V. Defrost System
TheRHA**B2Amodelsareequippedwithatimetempera-
ture type defrost board. Defrosting of the OD coil is
determined by both coil temperature and compressor run
time. See the “Specification Sheet” for factory settings.
Adjustment can be changed as required. There are 30,
60, and 90 minute settings available. Adjust only if
geographical conditions, outdoor humidity, or other ad-
verse conditions make it necessary.
DEFROST TIME ADJUSTMENT PIN
Figure 5
NOTE: If the time select pin remains in test position for 5
minutes, the control will ignore test mode and assume a
normal90 minutedefrost cycle. Toover ridethistime out,
remove the select pin briefly and replace back on test.
WARNING
To avoid electrical shock or death,
disconnect the power before changing
the defrost time cycle.
If adjustment of the run time appears advisable:
1. Disconnect power to OD unit.
2. Move the defrost time adjustment pin from 90 min-
utesto 60 minutesor 30 minutesasrequired (refer to
Figure 5).
3. Reconnect the electrical power.
The maximum defrost time is 14 minutes. Most defrost
cycles are shorter.
SERVICING: When servicing, it may be necessary to
rapidlyadvancethesystemthroughadefrostcycle.Todo
this:
Place the defrost time adjustment pin on Test. When the
unit starts the defrost cycle, quickly remove the time
selectpin to allow normal defrosting and defrost termina-
tiontoproceed.Theselectpinmaybereconnectedtotest
orrepeatthedefrostcycle,orthepinmaybeplacedinthe
desiredtime setting. (Jumping both testpinswitha small
insulated screw driver will also work.)
WARNING
To avoid electrical shock or death,
disconnect the electrical power before
servicing.

9
9
ROOM THERMOSTAT
(6 wires)
BHA BLOWER COIL
(5 wires)
RH OUTDOOR UNIT
THERMOSTAT* CONNECTIONS TO RH-HEAT PUMPS
WITH INDOOR BHA BLOWER COIL
COLOR CODE
1ST GROUP COLOR
2ND GROUP NUMBER
OR-ORANGE BK-BLACK
YL-YELLOW BU-BLUE
VT-VIOLET RD-RED
BR-BROWN TN-TAN
GN-GREEN GY-GRAY
WARNING
To avoid personal injury, shock or death, disconnect the
electrical power before electrically connecting any
equipment or changing any existing wiring.
A) No Outdoor Thermostat - Electric Heat Supplied During Defrost
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.
R W2 GC/X
RHxEH001
R W1 Y W2 E G C/X O
R Y W2 E C/X O
(1)(1)
ROOM THERMOSTAT (2)
(6 wires)
BHA BLOWER COIL
(5 wires)
RH OUTDOOR UNIT
B) With Outdoor Thermostat - Electric Heat Supplied During Defrost
ATK Not Controlling 1st Group of Electric Heaters - 9.6 to 28.8 KW
R W2 GY42 G C/X
RHxEH002
R W1 Y W2 E G C/X O
ATK05
(1) (1)
(3)
R Y W2 E C/X O
Notes: (1) BHA-TB blowers may require additional wire(s) here. See BHA-TB wiring diagram for details.

10
To avoid personal injury, shock or death, disconnect the
electrical power before electrically connecting any
equipment or changing any existing wiring.
COLOR CODE
1ST GROUP COLOR
2ND GROUP NUMBER
OR-ORANGE BK-BLACK
YL-YELLOW BU-BLUE
VT-VIOLET RD-RED
BR-BROWN TN-TAN
GN-GREEN GY-GRAY
THERMOSTAT* CONNECTIONS TO RH-HEAT PUMPS
WITH INDOOR BHA BLOWER COIL
*Approved Thermostats are: 10636701
10636702
D9807605
D9945804
1213405
1213404
1213403
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
R W2 G C/X
RHxEH003
ATK05
(1) (1)
R Y W2 E C/X O
R W1 Y E W2 G C/X O
Notes: (1) BHA-TB blowers may require additional wire(s) here. See BHA-TB wiring diagram for details.
Thermostats shown with required connections only.
Thermostats may have other terminals not shown in
diagrams.
WARNING

11
11
ELECTRIC HEAT STAGING USING GY42 AT BLOWER CONNECTOR
Heater KW from KW from Total
Kit W2 GY42 KW
EHK05B 4.8 0 4.8
EHK07B 4.8 2.4 7.2
EHK10B 4.8 4.8 9.6
EHK15B 4.8 9.6 14.4
EHK20B 9.6 9.6 19.2
EHK25B 14.4 9.6 24.0
EHK30B 19.2 9.6 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 tempera-
ture. 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 40,600
BTUH at 14°F outdoor temperature.
As the graph shows, 9.6KW (EHK10B) must be added to
meet the heating load. As the chart above shows, the
EHK10B 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 instal-
lation, 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.
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. ExtendGY42wireintothelowvoltageterminalarea.
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
COLOR CODE
1ST GROUP COLOR
2ND GROUP NUMBER
OR-ORANGE BK-BLACK
YL-YELLOW BU-BLUE
VT-VIOLET RD-RED
BR-BROWN TN-TAN
GN-GREEN GY-GRAY
WARNING
Toavoidpersonalinjury,shockordeath,
disconnect the electrical power before
electrically connecting any equipment
or changing any existing wiring.
As shipped, connector in blower coil is as shown above.
10 50
30 70
+ UNIT + 4.8KW UNIT + 9.6KW
OUTDOOR TEMP (°F)
UNIT ALONE BLDG. LOAD
10
0
20
30
40
50
60
70
80
RHA36A2A
w/ BHA36F002A
BTUH
(Thousands)
++++
+
++
BHAEH002
W2
TERM. STRIP
GY42
GY41
GY41
5 4 2 6 3 9 8 7 1
BHAEH001
5 4 2 6 3 9 8 7 1
W2
TERM. STRIP
GY42
GY41
GY41

12
System Checklist
1 Does the condenser fan blade rotate freely, and is it tight on the shaft?
2Does 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?
6Are 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?