255029-YTG-C-0506
10
Unitary Products Group
COOLING MODELS WITH ELECTRIC HEAT WIRING
1. “Y/Y2” Terminal on Air Handler Control Board must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.
2. Optional humidity switch - contacts open on humidity rise.
3. Remove HUM STAT Jumper on AH Control Board.
4. For heat pump applications - set MODE jumper on air handler control board to the HP position.
5. To change quantity of heat during HP defrost cycle - Reverse connections at W1 and W2 on Air Handler Control Board.
TWO-STAGE COOLING WIRING
1. “Y/Y2” Terminal on Air Handler Control Board must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.
2. Optional humidity switch - contacts open on humidity rise.
3. Remove HUM STAT Jumper on AH Control Board.
4. For heat pump applications - set MODE jumper on air handler control board to the HP position.
5. To change quantity of heat during HP defrost cycle - Reverse connections at W1 and W2 on Air Handler Control Board.
AH SERIES - 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
X / L
COM
HUMIDISTAT
2
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
X / L
COM
HUMIDISTAT
2
AH SERIES - Air Handler Control Wiring
Typical A/C with Electric Heat Applications
CONTROL WIRING - Air Handler & New 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
X / L
C
C
Y / Y2
Y1
Y1
Y2 OUT
Y2
W2 OUT
W1 OUT
BS
W2
W1
HUM
COM
HUMIDISTAT
*
Y1
