York MX Series User Manual

819682-UIM-A-0212
Johnson Controls Unitary Products 13
* Optional dehumidification humidistat switch contacts open on rise.
Notes:
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. Remove humidistat jumper on air handler control board.
3. For heat pump applications - set MODE jumper on air handler control board to the HP position.
4. To change quantity of heat during HP defrost cycle - reverse connections at W1 and W2 on air handler control board.
* Optional dehumidification humidistat switch contacts open on rise.
Notes:
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. Remove humidistat jumper on air handler control board.
3. For heat pump applications - set MODE jumper on air handler control board to the HP position.
4. To change quantity of heat during HP defrost cycle - reverse connections at W1 and W2 on air handler control board.
FIGURE 10:
Cooling Models with Electric Heat Wiring
Air Handler Control Wiring
Typical A/C - Cooling only Applications
THERMOSTAT
AIR HANDLER
BOARD
1 - STAGE
AIR CONDITIONING
RR
G
Y
W1
W2
C
G
W1
W2
Y
C
Y/Y2
Y1
O
HUM
X / L
COM
HUMIDISTAT
THERMOSTAT
AIR HANDLER
BOARD
1 - STAGE
AIR CONDITIONING
RR
G
Y
W1
W2
C
G
W1
W2
Y
C
Y/Y2
Y1
O
HUM
X / L
COM
HUMIDISTAT
Air Handler Control Wiring
Typical A/C with Electric Heat Applications
FIGURE 11: Single-Stage Heat Pump Wiring
CONTROL WIRING - Air Handler
And UPG Single Stage HP Systems
Single Stage HP with Standard Demand Defrost Control Board
THERMOSTAT
AIR HANDLER
BOARD
1 - STAGE
HEAT PUMP
RR R
GG
Y
W / W1
W
O
O
O
X / L X / L
X / L
C C
Y/Y2
Y1
Y
W1 66
W2
W1
HUM
COM
HUMIDISTAT
*
W2
E

York MX Series Specifications

General

Brand	York
Model	MX Series
Category	Air Handlers
Language	English