6
NOTES:
1) OUTDOOR THERMOSTAT (OT-1) SHOULD BE THE
FIRST TO CLOSE AND THE LAST TO OPEN.
2) CONNECT WHITE AND BROWN WIRES FROM AIR-
HANDLER TOGETHER IF OT-2 IS NOT USED.
3) REMOVE WIRE WHEN USING OUTDOOR THERMOSTAT
4) TERMINAL BLOCK MARKINGS ARE FOR AMANA® BRAND
AIRHANDLERS.
NOMENCLATURE
OT ---OUTDOOR THERMOSTAT (OPTIONAL)
EHR -EMERGENCY HEAT RELAY (O PTIONAL)
COLOR CODES
R --RED
Y --YELLOW
BL-BLUE
BR-BROWN
O --ORANGE
W -WHITE
G --GREEN
W2
TYPICAL H/P
ROOM THERMOSTAT
HEAT PUMP
SYSTEM COMPOSITE DIAGRAM
HEAT PUMPS
10 KW & BELOW
(O PTIONAL)
OU TDOO R THERM OSTAT
CLOSE O N TEM PERATURE FALL
R
G
C
W2
RED
GREEN
WHITE
BLUE
INDOOR UNIT
R
Y
O
W
BL
#18 GA. 5 WIRE
#18 GA. 7 WIRE
SEE
NOTE
R
G
BR
W
BL
SEE NOTE #4
R
E
D
Y
E
L
L
O
W
O
R
A
N
G
E
W
H
I
T
E
B
L
U
E
#18 GA. 6 W IRE NEED ED W HEN OT IS U SED
BL
W
G
R
C
O
Y
R
Y
O
C
W2
G
R
E
O
R
A
N
G
E
Y
E
L
L
O
W
#18 GA . 7 WIRE NEED ED W H EN TWO OT'S A RE USED
#18 GA. 5 WIRE
BL
O
W
Y
SEE NOTE #4
BL
SEE
NOTE
W
G
C
BLUE
W2
G
WHITE
GREEN
TYPICAL H/P
ROOM THERMOSTAT
SYSTEM COMPOSITE DIAGRAM
HEAT PUMPS
ABOVE 10 KW
HEAT PUMP
B
L
U
E
W
H
I
T
E
R
E
D
R
#18 GA. 7 WIRE
R
INDOOR UNIT
R
RED
W3
BROWN
SEE
NOTE
(O PT ION AL)
OU TD OOR THERM O STAT
CLOSE O N TEMPERATU RE FALL
BR
R
G
BR
BL
W2
C
O
Y
R
Y
O
C
W2
G
R
E
Thermostat
with Low Voltage Wires to Heat Pump Unit
System Start Up
NOTE: Units with crankcase heaters should have high voltage
power energized for 24 hours prior to start up.
Heat pumps are equipped with a time/temperature defrost
control with field selectable defrost intervals of 30, 60, or 90
minutes. This setting should be adjusted at this time if needed.
The defrost control also has SmartShift™ technology, which
delays compressor operation at defrost initiation and
termination. If disabling this function is desired, move the
jumper from “DLY” to “NORM” on the defrost control
Adequate refrigerant charge for the matching HSVTC evaporator
coil and 15 feet of lineset is supplied with the condensing unit. If
using evaporator coils other than HSVTC coil, it may be necessary
to add or remove refrigerant to attain proper charge. If line set
exceeds 15 feet in length, refrigerant should be added at .6 ounces
per foot of liquid line.
NOTE: Charge should always be checked using superheat when
using a piston and subcooling when using TXV equipped indoor
coil to verify proper charge.
Open the suction service valve first! If the liquid service valve is
opened first, oil from the compressor may be drawn into the in-
door coil TXV, restricting refrigerant flow and affecting operation
of the system.
POSSIBLE REFRIGERANT LEAK
To avoid a possible refrigerant leak, open the service valves until
the top of the stem is 1/8” from the retainer.
CAUTION
When opening valves with retainers, open each valve only until
the top of the stem is 1/8” from the retainer. To avoid loss of
refrigerant, DO NOT apply pressure to the retainer. When opening
valves without a retainer remove service valve cap and insert a
hex wrench into the valve stem and back out the stem by turning
the hex wrench counterclockwise. Open the valve until it contacts
the rolled lip of the valve body.
NOTE: These are not back-seating valves. It is not necessary to
force the stem tightly against the rolled lip.
After the refrigerant charge has bled into the system, open the
liquid service valve. The service valve cap is the secondary seal
for the valve and must be properly tightened to prevent leaks.
Make sure cap is clean and apply refrigerant oil to threads and
sealing surface on inside of cap. Tighten cap finger-tight and then
tighten additional 1/6 of a turn (1 wrench flat), or to the following
specification, to properly seat the sealing surfaces.
1. 3/8” valve to 5 - 10 in-lbs
2. 5/8” valve to 5 - 20 in-lbs
3. 3/4” valve to 5 - 20 in-lbs
4. 7/8” valve to 5 - 20 in-lbs
Do not introduce liquid refrigerant from the cylinder into the
crankcase of the compressor as this may damage the compressor.
1. Break vacuum by fully opening liquid and suction base
valves.
2. Set thermostat to call for cooling. Check indoor and outdoor
fan operation and allow system to stabilize for 10 minutes
for fixed orifices and 20 minutes for expansion valves.
