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262675-UIM-A-0806
Unitary Products Group 15
1. “Y” 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. MODE Jumper on AH control board should be set to A/C for air conditioners and HP for heat pumps.
5. To change quantity of heat during HP defrost cycle - Reverse connections at W1 & W2 on Air Handler Control Board
1. “Y” 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. MODE Jumper on AH control board should be set to A/C for air conditioners and HP for heat pumps.
5. To change quantity of heat during HP defrost cycle - Reverse connections at W1 & 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 10: Cooling Models with Electric Heat Wiring
MA SERIES - 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
*
MA SERIES - Air Handler Control Wiring
Typical A/C with Electric Heat Applications
FIGURE 11: Two-Stage Cooling Wiring
CONTROL WIRING - MA Series - 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
RR R
GG
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