WIRING DIAGRAMS
NOTE
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.
OBY2Y1G
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| Reversing |
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Reversing |
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| Fan | |||
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Valve |
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| Compressor |
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| Heat, Off, |
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Cool Mode |
| Emergency |
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| Compressor |
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| Contactor |
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| E/W1 |
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| THERMOSTAT |
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| C * |
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W2 |
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| L | R |
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| SYSTEM |
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| Limit or |
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| Limit or |
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| Safety | HOT | |||
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| Safety |
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| Heat |
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| MONITOR |
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| NEUTRAL | |||
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| SWITCH |
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| ACCESSORY |
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Aux |
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| RELAY N.O. |
| Transformer | The accessory relay scheme | ||||||||||||
Heat |
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| CONTACT |
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Relay |
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| Current Limited) | |||||||||
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| circuits exist in both systems. | ||||||||||
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| COMMON |
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| TWO COMMONS MUST |
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| BE JUMPERED TOGETHER! |
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| Safety |
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| Safety | HOT | |||||||||||
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| Switches | 24 VAC |
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| COMMON |
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| NEUTRAL | |||
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| Heat Pump Transformer |
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Figure 4. Typical wiring diagram for two transformer heat pump systems with safety circuits in BOTH systems
*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh “AA” Energizer® alkaline batteries.
Heat Pump Terminal Outputs
Refer to equipment manufacturers' instructions for specific system wiring information.
You can configure the thermostat for use with the following heat pump system types:
HEAT PUMP TYPE 1. Single stage compressor system; gas or electric backup.
This thermostat is designed to operate a
one transformer. If transformer safety circuits are in only one of the systems, remove the transformer of the system with NO safety circuits. If required, replace remaining transformer with a 75VA Class II transformer. After disconnecting one trans- former, the two commons must be jumpered together.
Use the terminal output information below to help you wire the thermostat properly for your heat pump system. After wiring, see CONFIGURATION section for proper thermostat configuration.
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| THERMOSTAT TERMINALS (HEAT PUMP) |
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SYSTEM | L | C* | R | W2 | E/W1 | Y2 | Y1 | G | O | B |
Heat | Malfunction | 24 Volt | 24 Volt | HP 1 and | Emergency | No | Heat and | Blower/Fan Energized | Energized | Energized |
Pump 1 | Light | (Common) | (Hot) | Emergency | Mode | Output | Cool mode | on call for Heat | in Cool | in Heat |
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| 2nd stage | 1st stage |
| 1st stage | and Cool | Mode | OFF |
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Heat |
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| HP 2 |
| 2nd | (compressor) | Set GAS/ELEC switch |
| Emergency |
Pump 2 |
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| 3rd stage |
| stage |
| for Emergency mode |
| mode |
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| compressor |
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*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh “AA” Energizer® alkaline batteries.
O
Reversing
Valve
Energized in
Cool Mode
B | Y1 |
| Y2 | G | |||||
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| Compressor |
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| Contactor |
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Reversing |
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| Stage 2 |
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Valve |
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Energized in |
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Heat Mode |
| Compressor |
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| Fan | ||||
Off Emergency |
| Contactor |
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| Relay | ||||||
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| Stage 1 |
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E/W1
Heat
Relay
Stage 1
W2
Heat
Relay
Stage 2
C * |
| THERMOSTAT | |||||||
R | SYSTEM | ||||||||
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| Hot |
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| 24 VAC |
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| 120 VAC |
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| Neutral | |
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| TRANSFORMER | |||||||
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Figure 5. Typical wiring diagram for single transformer
*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh “AA” Energizer® alkaline batteries.
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