819682-UIM-A-0212
14
Johnson Controls Unitary Products
* 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.
SECTION X: MAINTENANCE
Filters must be cleaned or replaced when they become dirty. Inspect at
least once per month. The frequency of cleaning depends upon the
hours of operation and the local atmospheric conditions. Clean filters
keep unit efficiency high.
LUBRICATION
The bearings of the blower motor are permanently lubricated.
FIGURE 12:
Two-Stage Heat Pump Wiring
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
X / L
C
C
Y / Y2
Y1
Y1
Y2 OUT
Y2
W2 OUT
W1 OUT
BS
W2
W1
HUM
COM
HUMIDISTAT *
Y1
