NOTE
IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE SYSTEMS, REMOVE THE TRANSFORMER OF THE SYSTEM WITH NO SAFETY CIRCUITS.
CUT AND
TAPE OFF!
Hot
120vAC | 24vAC |
Neutral
TRANSFORMER
O | B | Y1 | Y2 | G | A1 | W1 |
Changeover | Compressor |
| Damper |
| ||
Energized | Contactor |
|
| |||
| Motor |
| ||||
In Heat | Stage 2 |
|
| |||
|
|
| ||||
Changeover |
| Compressor | Fan |
| Heat | |
Energized |
| Contactor |
| Relay | ||
| Relay |
| ||||
In Cool |
| Stage 1 |
| Stage 1 | ||
|
|
| ||||
HEAT PUMP SYSTEM
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Thermostat
Control
Circuit
E1 | E2 | W2 | C |
Emergency
Relay
Constant
Output
|
|
|
|
|
|
|
Emergency |
|
|
| Heat | ||
Relay |
|
|
| Relay | ||
Switched |
|
|
| |||
|
| Stage 2 | ||||
Output |
|
| ||||
|
|
|
|
| ||
|
|
|
|
|
|
|
AUXILIARY HEATING SYSTEM
Malfunction
Light
THERMOSTAT
L |
|
|
| R |
|
| ||||||
System |
|
|
|
|
|
|
|
|
| SYSTEM |
| |
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
| Limit or |
|
|
| ||||
Monitor |
|
|
|
|
|
|
|
| ||||
|
|
|
|
| Safety |
|
|
| ||||
Switch |
|
|
|
|
|
|
|
| ||||
|
|
|
| Switches |
|
|
| |||||
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| TRANSFORMER | Limit or |
| |||||||
|
|
| Safety |
| ||||||||
|
|
|
|
|
|
|
|
| Hot |
| ||
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
| Switches |
| ||
|
|
|
|
|
|
|
|
|
|
|
| |
24vAC |
|
|
|
|
|
| 120vAC |
| ||||
|
|
|
|
|
|
|
| |||||
|
| |||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Neutral |
|
| ||
|
|
|
|
|
|
|
|
| ||||
DEPENDING ON SYSTEM REQUIREMENTS, REPLACE WITH A 75VA TRANS-
FORMER, IF NEEDED
Figure 5. Typical wiring diagram for
NOTE
Relay contacts shown are thermostatically operated. The accessory relay scheme is required when safety circuits exist in both systems.
!CAUTION
Polarity must be observed. If the HOT side of the second transformer is jumpered to the COMMON side of the first transformer, a short will be made. Damage to equipment will occur when power is restored.
Thermostat | Malfunction | |
Light | ||
Control | ||
| ||
Circuit |
|
O | B | Y1 |
| Y2 |
| G | A1 | W1 | ||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Changeover |
|
| Compressor |
|
|
| Damper |
|
| |||||||
|
| Energized |
|
| Contactor |
|
|
|
|
| ||||||||
|
|
|
|
|
|
| Motor |
|
| |||||||||
|
| In Heat |
|
| Stage 2 |
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Changeover |
|
| Compressor |
|
|
|
| Fan |
|
| Heat | |||||||
Energized |
|
| Contactor |
|
|
| Relay |
|
| Relay | ||||||||
In Cool |
|
| Stage 1 |
|
|
|
|
|
|
|
| Stage 1 | ||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
E1 E2
Emergency
Relay
Constant
Output
Emergency
Relay
Switched
Output
W2 | C | L R |
System
Monitor
Switch
Heat
Relay
Stage 2
|
|
|
|
|
|
|
| THERMOSTAT |
| |
|
|
|
|
|
|
|
| SYSTEM |
| |
|
|
|
|
|
|
|
|
|
|
|
Limit or |
|
|
|
|
|
|
|
| Limit or |
|
Safety |
|
|
|
|
|
|
| Hot | Safety |
|
|
|
|
|
|
| |||||
Switches |
|
|
|
|
|
|
| Switches |
| |
24vAC |
|
|
|
|
| 120vAC |
| |||
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
| |||
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Neutral |
|
|
24vAC |
|
| AUXILIARY |
|
| |||||
Accessory |
|
|
| HEATING |
|
| ||||
Relay N.O. |
| TRANSFORMER |
|
| ||||||
Contact |
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
HEAT PUMP SYSTEM | AUXILIARY HEATING SYSTEM |
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Limit or
Safety
Switches
|
|
|
|
|
|
|
| Limit or |
|
|
|
|
|
|
|
| Hot | Safety |
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
| Switches |
| |
24vAC |
|
|
|
|
|
| 120vAC |
| |
|
|
|
|
|
|
|
| ||
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Neutral
HEAT PUMP
TRANSFORMER
Figure 6. Typical wiring diagram for
5
