Figure 3 – Single Stage or Multi-Stage System (No Heat Pump)
with Two Transformers
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| NOTE: If continuous backlight or | ||
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| Remove Jumper Wire | hardwired power input are desired but | |||||||
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| Jumper |
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| do not function in both HEAT and COOL | ||||||||||
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| between RH & RC | |||||||||||
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| L |
| O/B | Y | Y2 | W/E | W2 | G | RH | RC |
| C | modes, cut the heating transformer 24V | |||||||||||||||||
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| wires and tape off. Connect the neutral | |||||||||||||||||||||||||||
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| System |
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| circuit disconnected from the heating | |||||
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| transformer to the neutral circuit of the | ||
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| Blower/ |
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| Single |
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| O | B |
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| No Output |
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| cooling transformer. Disconnect the wire | |||||||
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| Stage 1 |
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| Circulator |
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| to the RH terminal and install a jumper | ||||||||||
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| (SS1) |
| Fault | Energized | Energized |
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| No | Heat |
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| Fan Energized | 24 Volt | 24 Volt | Optional |
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| Indicator | Constantly | Constantly | Cool Mode | Output | Mode |
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| on Call for | (Hot) | (Hot) |
| 24 Volt |
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| between RH and RC. Depending on | ||||||||||||
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| (NOT | in | in Heat, Off, | 1st Stage |
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| 1st Stage |
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| Cool (and | Heat | Cool |
| (Com- |
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| the system requirements, replace the | |||||||||||
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| Multi- |
| USED) | Cool Mode | Emergency |
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| Cool |
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| Heat Mode | Heat if |
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| mon) |
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| Mode |
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| Stage 2 |
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| Mode |
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| 2nd Stage | configured |
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| cooling transformer with a 75VA class II | ||||||||
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| for Electric |
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| (MS2) |
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| 2nd |
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| transformer if needed. | ||||||
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| Stage |
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| Heat) |
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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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| CLASS II |
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HEATING |
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| TRANSFORMER | |||||||||||
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| CLASS II |
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| TRANSFORMER |
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Figure 4 – 3-Wire (SPDT) Heat Only Zone Valve Wiring
Jumper
6 | Y | W | G | RH RC C |
System
Single Stage
Closes Valve
(6)
Opens Valve
(4)
Blower/Circulator Fan Energized
24 Volt | 24 Volt |
(Hot) | (Hot) |
Heat | Cool |
(5) |
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Constant
24Volt (Com- mon)
NEUTRAL
24VAC
HOT
120VAC
CLASS II
TRANSFORMER
The Emerson logo is a trademark and service mark of Emerson Electric Co.
