Field Wiring Diagrams
8
W1 HEAT
JP1: internal RC/RH Jumper
24RC
24RH
G FAN
W2/O/B
Y1 COMP
Y2 COMP
24C
Air Handler
System Type D - Variable Speed Air Handler with 2 Step Heat Pump
Fan G
Heat Stage 1 W1
Compressor Stage 1 Y
24VAC Return R
24VAC Common B/C
Compressor Stage 2 BK
O
RED
GREEN
WHITE
YELLOW
ORANGE
BROWN
BLUE
RS1
RS1
RS2
RS2
Remote
Sensors
Remote
Sensor 1
Remote
Sensor 2
Wiring is not
polarized
Note 1 - Field installed jumper from R to O
(Note 1)
Note 2 - Remove R to BK jumper
Thermostat Connection
Note 3
Y
LO
Remote Temperature Sensor Connections and Operation:
Indoor sensor connected to RS1. Replaces internal sensor. RS2 not connected.
Indoor sensor connected to RS2. Averages temperature with internal sensor. RS1 not connected.
Indoor sensors connected to RS1 and RS2. Averages RS1 and RS2 sensor temperatures.
Internal sensor is not used.
Outdoor sensor connected to RS2. Reports outdoor temperature to comfort control.
Indoor sensor connected to RS1 and outdoor sensor connected to RS2. RS1 replaces the internal
sensor. RS2 reports the outdoor temperature to comfort control.
Outdoor Unit
Compressor Stage 1 Y1
24VAC Return R
24VAC Common B
Compressor Stage 2 Y2
X2
O
(Note 2)
Note 3 - For 2 Step Heat Pump, outdoor unit contains one 2 stage scroll compressor
Air Handler
Jumper
(Note 2)
W1 HEAT
JP1: internal RC/RH Jumper
24RC
24RH
G FAN
W2/O/B
Y1 COMP
Y2 COMP
24C
Oil Furnace-
PSC or Variable speed
System Type E - Oil Furnace with 1 or 2 Stage Cooling
Fan G
Heat Stage 1 W1
Compressor Stage 1 Y1
24VAC Return R
24VAC Common B/C
Compressor Stage 2 Y2
BK
RED
GREEN
WHITE
YELLOW
BROWN
BLUE
RS1
RS1
RS2
RS2
Remote
Sensors
Remote
Sensor 1
Remote
Sensor 2
Wiring is not
polarized
Note 1 - May be Y, Y1, or Y
LO
(Note 1)
(Note 6)
Note 2 - May be Y or Y2
Note 3 - For variable speed oil furnaces, factory installed
jumpers R to O and R to BK
Note 4 - R to ODU required for 2 stage cooling models
Note 5 - Variable speed furnace required for 2 stage cooling
Note 6 - Field supplied Isolation Relay
Thermostat Connection
O
Remote Temperature Sensor Connections and Operation:
Indoor sensor connected to RS1. Replaces internal sensor. RS2 not connected.
Indoor sensor connected to RS2. Averages temperature with internal sensor. RS1 not connected.
Indoor sensors connected to RS1 and RS2. Averages RS1 and RS2 sensor temperatures.
Internal sensor is not used.
Outdoor sensor connected to RS2. Reports outdoor temperature to comfort control.
Indoor sensor connected to RS1 and outdoor sensor connected to RS2. RS1 replaces the internal
sensor. RS2 reports the outdoor temperature to comfort control.
Outdoor Unit
Compressor Stage 1 Y1
24VAC Return R
24VAC Common B
Compressor Stage 2 Y2
(Note 4)
(Note 7)
(Note 2, Note 5)
(Note 3)
R1
OIL BURNER PRIMARY
R1
(Isolation relay, See R1 below)
Note 7 - For 2 Stage Cooling, outdoor unit contains two compressors
W1 HEAT
JP1: internal RC/RH Jumper
24RC
24RH
G FAN
W2/O/B
Y1 COMP
Y2 COMP
24C
Air Handler
System Type C - PSC, Variable Speed, or Communicating Air Handler with 1 or 2 Stage/Step Heat Pump
Fan G
Heat Stage 1 W1
Compressor Stage 1 Y1
24VAC Return R
24VAC Common B/C
Compressor Stage 2 Y2
BK
O
RED
GREEN
WHITE
YELLOW
ORANGE
BROWN
BLUE
RS1
RS1
RS2
RS2
Remote
Sensors
Remote
Sensor 1
Remote
Sensor 2
Wiring is not
polarized
Note 1 - May be W or W1
(Note 1)
(Note 2)
(Note 3)
(Note 4, Note 5, Note 6, Note 7)
Note 2 - May be Y, Y1, or Y
LO
Note 3 - May be Y or Y2
Note 4 - Applies to 2 step heat pumps matched with communicating air handler only.
All other variable speed air handlers use system type D diagram.
Thermostat Connection
Remote Temperature Sensor Connections and Operation:
Indoor sensor connected to RS1. Replaces internal sensor. RS2 not connected.
Indoor sensor connected to RS2. Averages temperature with internal sensor. RS1 not connected.
Indoor sensors connected to RS1 and RS2. Averages RS1 and RS2 sensor temperatures.
Internal sensor is not used.
Outdoor sensor connected to RS2. Reports outdoor temperature to comfort control.
Indoor sensor connected to RS1 and outdoor sensor connected to RS2. RS1 replaces the internal
sensor. RS2 reports the outdoor temperature to comfort control.
Outdoor Unit
Compressor Stage 1 Y1
24VAC Return R
24VAC Common B
Compressor Stage 2 Y2
X2
O
Note 5 - For 2 Stage Cooling, outdoor unit contains two compressors
Note 6 - For 2 Step Cooling, outdoor unit contains one 2 stage scroll compressor
Note 7 - PSC air handler for single stage heat pump only
