WIRING DIAGRAMS
Figure 5 – Single Stage or Multi-Stage System (No Heat Pump) with Two Transformers
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| Jumper | Remove Jumper Wire |
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| between RH & RC |
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| L | O/B | Y | Y2 | W/E | W2 | G | RH | RC | C |
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| Single |
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| No |
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| Blower/ |
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| Stage 1 |
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| Energized Constantly |
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| No Output | Circulator |
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| Output |
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| (SS1) | Fault | in Cool Mode |
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| Fan Energized |
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| Optional |
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| Heat |
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| 24 Volt | 24 Volt |
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| Indicator | B | Cool Mode |
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| on Call for | 24 Volt |
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| (NOT | 1st Stage |
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| Cool (and | (Hot) | (Hot) | (Com- |
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| Heat | Cool |
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| Multi- | USED) | Energized Constantly |
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| Cool | 1st Stage | Heat Mode | Heat if | mon) |
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| in Heat, Off, |
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| configured |
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| Stage 2 |
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| Emergency |
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| 2nd Stage | for Electric |
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| 2nd |
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| (MS2) |
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| Mode |
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| Heat) |
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| Stage |
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| NEUTRAL |
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| NEUTRAL |
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| 24VAC |
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| 120VAC | |||
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| HOT |
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120VAC |
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| 24VAC |
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| COOLING | |||
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| HOT |
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HEATING |
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| CLASS II |
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| TRANSFORMER |
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| CLASS II |
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| TRANSFORMER |
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Figure 6 – 3-Wire (SPDT) Heat Only Zone Valve Wiring
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| Jumper |
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6 | Y | W | G | RH RC | C |
System
Single Stage
3-wire
Zone Valve application
Closes
Valve
(6)
Opens
Valve
(4)
Blower/Circulator
Fan Energized
24Volt (Hot) Heat
(5)
24Volt (Hot) Cool
Constant
24Volt (Com- mon)
NEUTRAL
24VAC
HOT
120VAC
CLASS II
TRANSFORMER
4
