WIRING DIAGRAMS
Figure 2 – Single Stage, SS1, or Multi-Stage, MS2, System (No Heat Pump)
with Single Transformer (Gas, Oil or Electric)
Jumper
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Single | Diagnostic | O |
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Energized Constantly |
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Stage 1 |
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| No Output | Circulator |
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Indicator | in |
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| No | Heat | 24 Volt | 24 Volt |
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(SS1) | Input | Cool Mode |
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| Fan Energized | Optional |
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| Cool Mode | Output | Mode |
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| on Call for | (Hot) | (Hot) | 24 Volt |
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| or |
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| System | B | 1st Stage |
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| 1st Stage |
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| Cool (and | Heat | Cool | (Com- |
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Multi- |
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Malfunction |
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| Heat Mode | Heat if |
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| mon) |
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Stage 2 | Energized Constantly |
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| configured |
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Switch | in Heat, Off, |
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(MS2) | Input |
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| Emergency |
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| Heat) |
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Comfort Alert II Module
or Similar System
Diagnostic Module
See Module Instructions
for details
NEUTRAL |
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24VAC | 120VAC |
HOT |
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* Common connection required for diagnostic or malfunction indication. |
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CLASS II |
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TRANSFORMER |
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Figure 3 – Single Stage, SS1, or Multi-Stage, MS2, System (No Heat Pump)
with Two Transformer (Gas, Oil or Electric)
Jumper
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| O/B | Y | Y2 | W/E | W2 | G | RH | RC | C |
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| Single |
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| Energized Constantly |
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| Stage 1 |
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| No Output | Circulator |
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| (SS1) |
| Diagnostic |
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| Heat |
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| Fan Energized | 24 Volt | 24 Volt |
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| Cool Mode | Cool Mode | Output |
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| on Call for | Optional |
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| Indicator |
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| B | 1st Stage |
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| Cool (and | Heat | Cool | (Com- |
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| Cool |
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| Stage 2 |
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| Energized Constantly |
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| in Heat, Off, |
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| Emergency |
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| Heat) |
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| Mode |
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| NEUTRAL |
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| 24VAC |
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| 120VAC | |
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| NEUTRAL |
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| HOT |
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120VAC |
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| COOLING | ||||||
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| HOT |
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| CLASS II |
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HEATING |
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| TRANSFORMER |
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| CLASS II |
| * Common connection required for diagnostic or malfunction indication. |
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| TRANSFORMER |
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Figure 4 – Heat Pump Systems, HP1 (Single Stage Compressor System with Gas or Electric backup),
HP2 (Multi-Stage Compressor or Two Compressor System with Gas or Electric backup)
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| Jumper |
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L | O/B | Y | Y2 | +W/E | +W2 | G | RH RC | C | 6 |
System
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| Heat Mode - 2nd | Heat Mode - 3rd |
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| Stage, Emergency | Stage, Emergency |
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| Heat Pump 1 |
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| Mode - 1st Stage | Mode - 2nd Stage | Blower/ |
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| No | +Note: Dual Fuel option | +Note: Dual Fuel option | Circulator Fan |
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| (HP1) | Diagnostic | Heat and |
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| Cool Mode | Output | stage 1 (compressor) | stage 1 (compressor) | Energized on | 24 Volt | 24 Volt | Optional |
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| Indicator |
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| Cool Mode |
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| when auxiliary heat | when auxiliary heat | Call for Heat | 24 Volt |
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| is energized | is energized | or Cool. | (Hot) | (Hot) | (Com- |
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| or System | 1st Stage |
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| Heat Mode - 3rd | Heat | Heat | Cool |
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| Heat Pump 2 | Malfunction | Energized in | (Compressor) | 2nd | Set Elect/Gas | mon) |
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| Stage, Emergency | Stage. Emergency |
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| (HP2) | Switch | Heat, Off, |
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| Stage | Mode - 1st Stage | Mode - 2nd Stage | Option for |
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| Emergency |
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| (Com- | +Note: Dual Fuel option | +Note: Dual Fuel option | Emergency |
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| pressor) | mode |
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| stage 1 (compressor) | stage 1 (compressor) |
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| when auxiliary heat | when auxiliary heat |
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| is energized | is energized |
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Comfort Alert II Module |
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or Similar System |
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| NEUTRAL |
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Diagnostic Module |
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| 24VAC |
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See Module Instructions |
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| HOT |
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| for details | * Common connection required for diagnostic or malfunction indication. |
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| CLASS II | |||||||||||||||
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| + Dual Fuel option, if selected turns off compressor(s) when Auxiliary stages energize. |
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| TRANSFORMER |
120VAC
Figure 5 – 3-Wire (SPDT) Heat Only Zone Valve Wiring
Jumper
| 6 | Y | W | G | RH | RC | C | |||||||
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Single Stage |
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| Constant | |
Closes |
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| Opens | Blower/Circulator | 24 Volt | 24 Volt | ||||||||
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| 24 Volt | ||||||||||||
Zone Valve | Valve |
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| Valve | Fan Energized | (Hot) | (Hot) | (Com- | ||||||
application | (6) |
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| Heat | Cool | mon) | |||
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| NEUTRAL |
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| 24VAC |
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| CLASS II | ||||
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| TRANSFORMER |