Specifications
U-5 IOM 11
CIRCUIT #1
COOLING ONLY (1ST STAGE)
WITH HOT GAS REHEAT
(DEHUMIDIFICATION)
CIRCUIT #2
1ST STAGE HEATING
2ND STAGE COOLING
#1
COMPRESSOR
#2
COMPRESSOR
T3
T3
T2
T2
T1
T1
T1
T1
T1
T3
T3
T3
T2
T2
T2
L3
L3
L3
L2
L2
L2
L1
L1
L1
1M
2M
SEE NOTE 7
TRANSFORMER
24 VAC
75 VA
BLACK
SEE NOTES
1, 8 & 11
YELLOW
BLUE
3R
3
1
52
4
HV
3
1
5
2 4
4R
1R
TD
2R
3
3
1
1
5
5
4
4
2
2
LP
LP
CS
CS
HP HP
WT
3M
RS
S3
S1
1
2
DM
BLOWER
MOTOR
95
96
SEE NOTE 3
OL
2
#1
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 blower motors. All other blower motors have auto reset overloads.
4. Both the HS and OT sensors are contained within one device.
5. JCI Metasys UNT110-1 uses a factory installed program.
6. This factory wired jumper between terminals BI1 and 24 VAC indicates occupied status.
7. The optional “Water Temperature Switch” (WT) is also included in the optional “Low Temperature Package” (TL).
8. Both transformers must be phased identically: L1 is always the transformer’s black lead.
9. Johnson Controls, Inc. supplied jumper wire. Remove this jumper wire only if using a separate load transformer (by others).
10. The use of three-conductor shielded cable is required between relays 6R and 7R and the electric preheat control panel’s terminal block.
11. Insulate all unused wire ends.
Ground
Compressor Contactor (Circuit #1)
Compressor Contactor (Circuit #2)
Blower Contactor
Lockout Relay (Circuit #1)
Lockout Relay (Circuit #2)
Lockout Signal Relay
Hot Gas Reheat Relay (Circuit #1)
Cooling Relay (Circuit #2)
Stage #1 Electric Preheat Relay (PE)
Stage #2 Electric Preheat Relay (PE)
Hot-Gas Reheat Valve (Circuit #1)
4-Way Reversing Valve (Circuit #2)
HP High Pressure Switch (400 psi)
LP Low Pressure Switch (7 psi)
CS Condensate Switch (Optional)
WT Water Temperature Switch (Optional)
RS Random Start Relay (25-60 Seconds)
TD Time Delay Relay (25-60 Seconds)
DM Damper Motor
OL Overload (See Note 3)
AF Airflow Sensor
DA Discharge Air Sensor
HS Humidistat (See Note 4)
MA Mixed Airflow
OT Outdoor Thermostat (See Note 4)
1M
2M
3M
1R
2R
3R
4R
5R
6R
7R
HV
RV
Control Voltage Factory Wiring (24 VAC)
Control Voltage Field Wiring (24 VAC)
Line Voltage Factory Wiring
Line Voltage Field Wiring
LEGEND: