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Control Wiring
WARNING:
at the fuse box or service panel before making
any electrical connections� Also, the ground
connection must be completed before making line
voltage connections� Failure to do so can result in
electrical shock, severe personal injury, or death�
Control Wiring
Running low-voltage wires in conduit with line
voltage power wires is not recommended� Low-
voltage wiring may be run through the insulated
plastic bushing provided in the 7/8" [19 mm]
hole in the base panel, up to and attached to
the pigtails from the bottom of the control box�
Conduit can be run to the base panel if desired by
removing the insulated bushing�
A thermostat and a 24-volt, 40 VA minimum
transformer are required for the control circuit
of the system� The furnace or the air handler
transformer may be used if sufficient� See the
wiring diagram for reference� Use "Wire Size" table
on this page to size the 24-volt control wiring�
Do not use phone cord to connect indoor and
outdoor units and thermostat� This could damage
the controls and may not be adequately sized for
the control's electrical load�
TYPICAL
CONTROL WIRING FOR AIR HANDLER
*If maximum outlet temperature rise is
desired, it is recommended that W1 and
W2 be jumpered together.
Air Handler
WH/BL
W2
GR/BK
G
*
YL
Y
1
WH/BK
W1
*
B
BL
*
ODD
GR/YL
BR
*Not present on all
C
air-handler models.
RD
R
* 2
Y
YL/BL
WIRING INFORMATION
Line Voltage
-
Field Installed
-
Factory Standard
Turn off electric power
Heat Pump Thermostat
Optional Field Installed Jumper (see note 1)
Y G W2
B
C
E
OPTIONAL
- 1 STAGE HEAT
FIELD WIRE SIZE FOR 24-VOLT THERMOSTAT CIRCUITS
Thermostat
SOLID COPPER WIRE – AWG.
Load (amps)
3.0
18
16
2.5
18
16
2.0
18
16
20
50
[6]
[15]
Length of Run – Feet [m] (1)
(1) Wire length equals twice the run distance�
NOTICE: Do not use control wiring smaller than No� 18
AWG between thermostat and outdoor unit�
Typical Noncommunicating
Thermostat Wiring Diagrams
The following figures show the typical wiring
diagrams for RH1T; RHIV air handlers and 1-stage
heat pump and dual fuel applications with a gas
furnace and 1-stage heat pump� Cooling and
heat pump airflows may need to be adjusted
for homeowner comfort once the system is
operational�
WIRE COLOR CODE
BK – BLACK
GY – GRAY
BR – BROWN
O – ORANGE
BL – BLUE
PR – PURPLE
G – GREEN
R – RED
R
Heat Pump
Outdoor Unit
YL
Y
BL
B
BR
C
R
RD
PR
D
WIRING
14
12
10
10
10
14
12
10
10
10
14
12
10
10
10
100 150 200
250 300
[30] [46] [51]
[76] [91]
W – WHITE
Y – YELLOW
NOTES:
1. Jumper "E" to "W2" on
thermostat to transfer
control of supplemental
heat to 1st stage when
the emergency heat
switch is on.
2. This wire turns on elec-
tric heat strip during
defrost, omit for most
economical operation.
WIRE COLOR CODE
BK = BLACK
BL = BLUE
BR = BROWN
GR = GREEN
PR = PURPLE
RD = RED
WH = WHITE
YL = YELLOW
27
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