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Local codes often require a disconnect switch located near
the unit; do not install the switch on the unit. Refer to the
installation instructions supplied with the indoor furnace/
air handler for specific wiring connections and indoor unit
configuration. Likewise, consult the instructions packaged
with the thermostat for mounting and location information.
Overcurrent Protection
The following overcurrent protection devices are approved
for use.
• Time delay fuses
• HACR type circuit breakers
These devices have sufficient time delay to permit the
motor-compressor to start and accelerate its load.
Three Phase Compressor Rotation
Use care when handling scroll compressors.
Dome temperatures could be hot.
Three phase compressors are power phase dependent
and can rotate in either direction.
Verify proper rotation for three phase compressors by
ensuring the suction pressure drops and discharge
pressure rises when the compressor is energized.
To correct, disconnect power and switch any two leads at
the unit contactor and re-observe.
High Voltage Connections
Route power supply and ground wires through the high
voltage port and terminate in accordance with the wiring
diagram provided inside the control panel cover.
Low Voltage Connections
The indoor transformer must supply 24 volt AC low voltage
power to the outdoor section for the control wiring. Cooling
only units require 25VA minimum and heat pump units
require 40VA minimum. Low voltage wiring for two-stage
units depends on the thermostat used and the number of
control wires between the indoor unit and the condensing
unit. Route control wires through the low voltage port and
terminate in accordance with the wiring diagram provided
inside the control panel cover.
CAUTION
SYSTEM COMPOSITE DIAGRAM
HEAT PUMPS
10 KW & BELOW
HEAT PUMP
C
W2
O
Y
R
B
W
O
Y
R
H
R
E
L
E
U
I
A
L
D
E
T
N
L
R
E
G
O
E
W
Y
O
W
BL
#18 GA. 5 WIRE
(OPTIONAL)
OUTDOOR THERMOSTAT
CLOSE ON TEMPERATURE FALL
SYSTEM COMPOSITE DIAGRAM
HEAT PUMPS
ABOVE 10 KW
HEAT PUMP
C
W2
O
Y
R
B
W
O
Y
R
L
H
R
E
E
U
I
A
L
D
T
N
L
E
R
E
G
O
E
W
Y
O
W
BL
(OPTIONAL)
OUTDOOR THERMOSTAT
CLOSE ON TEMPERATURE FALL
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.
Thermostat with Low Voltage Wires to Heat Pump
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
6
TYPICAL H/P
#18 GA. 7 WIRE
ROOM THERMOSTAT
INDOOR UNIT
Y
O
C
W2 G
R
E
R
R
G
G
SEE
NOTE
BR
W
W
BL
BL
SEE NOTE #4
#18 GA. 6 WIRE NEEDED WHEN OT IS USED
TYPICAL H/P
#18 GA. 7 WIRE
ROOM THERMOSTAT
INDOOR UNIT
Y
O
C
W2 G
R
E
R
R
BR
G
G
SEE
NOTE
W
SEE
NOTE
BR
BL
BL
#18 GA. 5 WIRE
SEE NOTE #4
#18 GA. 7 WIRE NEEDED WHEN TWO OT'S ARE USED
NOMENCLATURE
OT ---OUTDOOR THERMOSTAT (OPTIONAL)
EHR -EMERGENCY HEAT RELAY (OPTIONAL)
Unit
R
RED
G
GREEN
WHITE
W2
C
BLUE
R
RED
G
GREEN
WHITE
W2
BROWN
W3
C
BLUE
COLOR CODES
R --RED
Y --YELLOW
BL-BLUE
BR-BROWN
O --ORANGE
W -WHITE
G --GREEN
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