10
Johnson Controls Unitary Products
824755-YTG-C-0912
TYPICAL THERMOSTAT CONNECTION
Cooling Models with and without Electric Heat Wiring
* Optional dehumidification humidistat switch contacts open on humidity rise.
NOTES:
1. “Y/Y2” Thermostat wire must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.
2. Remove humidistat jumper on air handler control board.
3. For heat pump applications - set AC/HP jumper on air handler control board to the HP position.
TYPICAL THERMOSTAT WIRING FOR 2-STAGE
HEAT PUMP WITH ECM BLOWER MOTOR
* Optional dehumidification humidistat switch contacts open on humidity rise.
NOTES
:
1. “Y/Y2” Thermostat wire must be connected for full CFM and applications
requiring 60 second blower off delay for SEER enhancement.
2. Remove humidistat jumper on air handler control board.
3. For heat pump applications - set AC/HP jumper on air handler control board
to the HP position.
AIR HANDLER WITH COMMUNICATING
AC OR HP
Air Handler Control Wiring
Typical A/C - Cooling only Applications
THERMOSTAT
AIR HANDLER
BOARD
1 - STAGE
AIR CONDITIONING
R
R
G
Y
W1
W2
C
G
W1
W2
Y
C
Y / Y2
Y1
O
HUM
COM
HUMIDISTAT
THERMOSTAT
AIR HANDLER
BOARD
1 - STAGE
AIR CONDITIONING
R
R
G
Y
W1
W2
C
G
W1
W2
Y
C
Y / Y2
Y1
O
HUM
COM
HUMIDISTAT
Air Handler Control Wiring
Typical A/C with Electric Heat Applications
CONTROL WIRING - Air Handler & UPG HP Systems Two Stage
H/P with York Guard VI Board & Copeland “Ultra Tech”
Conventional Application - Not Hot Heat Pump
THERMOSTAT
AIR HANDLER
BOARD
2 - STAGE SCROLL
HEAT PUMP
R
R
R
G
G
Y2
E
W
W
O
O
O
X / L
X / L
C
C
Y / Y2
Y1
Y1
Y2 OUT
Y2
W2 OUT
W1 OUT
BS
W2
W1
HUM
COM
HUMIDISTAT *
Y1
FIGURE 1: Air Handler with Communicating AC or HP
A+
R
C
B-
A+
R
C
B-
A+
R
C
B-
R
G
Y/Y2
Y1
W2
W1
O
HUM
COM
Touch Screen
Communicating
Control
Air Handler
Communicating
Control
Air Conditioner/Heat Pump
Communicating Control
