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System Type C - PSC, Variable Speed, or Communicating Air Handler with 1 or 2 Stage/Step Heat Pump
(Note 4, Note 5, Note 6, Note 7)
Outdoor Unit
24VAC Common B
24VAC Return R
X2
O
Compressor Stage 1 Y1
Compressor Stage 2 Y2
Note 1 - May be W or W1
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.
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
System Type D - Variable Speed Air Handler with 2 Step Heat Pump
Note 3
Outdoor Unit
24VAC Common B
24VAC Return R
X2
O
Compressor Stage 1 Y1
Compressor Stage 2 Y2
Note 1 - Field installed jumper from R to O
Note 2 - Remove R to BK jumper
Note 3 - For 2 Step Heat Pump, outdoor unit contains one 2 stage scroll compressor
System Type E - Oil Furnace with 1 or 2 Stage Cooling
(Note 7)
Outdoor Unit
24VAC Common B
24VAC Return R
(Note 4)
Compressor Stage 1 Y1
Compressor Stage 2 Y2
Note 1 - May be Y, Y1, or Y
LO
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
Note 7 - For 2 Stage Cooling, outdoor unit contains two compressors
Field Wiring Diagrams
Air Handler
BLUE
24VAC Common B/C
RED
24VAC Return R
WHITE
Heat Stage 1 W1
(Note 1)
O
GREEN
Fan G
YELLOW
Compressor Stage 1 Y1
(Note 2)
Compressor Stage 2 Y2
(Note 3)
BK
Air Handler
BLUE
24VAC Common B/C
RED
24VAC Return R
WHITE
Heat Stage 1 W1
(Note 1)
O
GREEN
Fan G
YELLOW
Y
LO
Compressor Stage 1 Y
Compressor Stage 2 BK
(Note 2)
R1
Oil Furnace-
PSC or Variable speed
BLUE
24VAC Common B/C
RED
24VAC Return R
WHITE
Heat Stage 1 W1
(Note 3)
O
GREEN
Fan G
YELLOW
Compressor Stage 1 Y1
(Note 1)
Compressor Stage 2 Y2
(Note 2, Note 5)
BK
OIL BURNER PRIMARY
(Note 6)
R1
Thermostat Connection
JP1: internal RC/RH Jumper
24C
24RC
24RH
W1 HEAT
G FAN
Y1 COMP
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.
Thermostat Connection
JP1: internal RC/RH Jumper
24C
24RC
24RH
W1 HEAT
G FAN
Y1 COMP
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.
(Isolation relay, See R1 below)
Thermostat Connection
JP1: internal RC/RH Jumper
24C
24RC
24RH
W1 HEAT
G FAN
Y1 COMP
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.
Remote
Sensors
RS1
RS1
RS2
RS2
W2/O/B
Wiring is not
Y2 COMP
polarized
Remote
Sensors
RS1
RS1
RS2
RS2
W2/O/B
Y2 COMP
Remote
Sensors
RS1
RS1
RS2
RS2
W2/O/B
Wiring is not
Y2 COMP
polarized
Remote
Sensor 1
Remote
Sensor 2
Air Handler
(Note 2)
Jumper
Remote
Sensor 1
Remote
Sensor 2
Wiring is not
polarized
Remote
Sensor 1
Remote
Sensor 2
8
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