Specifications
U-5 IOM 7
CIRCUIT #2
FIRST STAGE HEATING
COND STAGE COOLING
#2
COMPRESSOR
T3
T1
T2
T3
T2 T1
L3 L2
L1
2M
BLACK
BLACK
BLACK
BLOWER
MOTOR
96
95
T2
BLACK
BLACK
BLACK
3
4
5
SEE NOTE 6
SEE NOTE 3
WT
HP
CS
LP
6
1
2
3
C1
C2
4R
2R
TD
HR
RV
CIRCUIT #2
CIRCUIT #1
3
1
4
5
2
1
5
4
2
T3 T1
L3
L2
L1
3M
S3
S1
1
2
RS
DM
3R
NOTES:
1. All units are factory-wired to customer order.
For 208 volt units, use the black and red transformer leads.
For 230 volt units, use the black and orange transformer leads.
For 460 volt units, use the black and black/red strip transformer leads.
2. Supply wiring must have copper conductors.
3. An external manual reset overload is used on all 5 HP through 20 HP blower
motors. All other blower motors have internal auto reset overloads.
4. Insulate all unused wire ends.
4. Both transformers must be phased identically: L1 is always the transformer’s black
lead.
5. The optional “Water Temperature Switch” (WT) is also included in the optional “Low
Temperature Package” (TL).
LEGEND:
Ground
Compressor Contactor (Circuit #1)
Compressor Contactor (Circuit #2)
Blower Contactor
Lockout Relay (Circuit #1)
Lockout Relay (Circuit #2)
Hot Gas Reheat Relay (Circuit #1)
Cooling Relay (Circuit #2)
Hot Gas Reheat Valve (Circuit #2)
Reversing Valve (Circuit #2)
HP High Pressure Switch (400 psi)
LP Low Pressure Switch (7 psi)
CS Condensate Switch (Optional)
WT Water Temperature Switch (32 F)
Optional (Circuit #2)
DM Damper Motor
OL Overload Relay (See Note 2)
RS Random Start Relay (25-60 Seconds)
TD Time Delay Relay (25-60 Seconds)
1M
2M
3M
1R
2R
3R
4R
HR
RV
Control Voltage Factory Wiring (24 VAC)
Control Voltage Field Wiring (24 VAC)
Line Voltage Factory Wiring
Line Voltage Field Wiring