WIRING CONNECTIONS
Refer to equipment manufacturers' instructions for specifi c system wiring information. After wiring, see CONFIGURA- TION section for proper thermostat confi guration.
Wiring diagrams shown are for typical systems and describe the thermostat terminal functions.
| TERMINAL DESIGNATION DESCRIPTIONS |
Terminal Designation | Description |
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O/B | Changeover valve for heat pump energized constantly in cooling and off/heating |
Y | Compressor Relay |
G | Fan Relay |
RC | Power for Cooling |
RH | Power for Heating |
C | Common wire from secondary side of cooling (Optional). Required for fault indication, continuous back- |
| light operation or remote temperature sensor operation |
W | Heat Relay (Stage 1) |
Common (DC) for wired remote temperature sensor | |
S | Frequency signal from remote temperature sensor |
+ | Power (DC) to remote temperature sensor |
L | Compressor diagnostic indicator for systems with diagnostic connection typically found on Heat pump |
| systems or with Copeland's Comfort Alert |
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WIRING DIAGRAMS
Figure 2 – Single Stage or Heat Pump with no Auxiliary Heat with Single Transformer
System | RC | RH | C | Y* | W* | G | O/B | 6 | L | |
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| 24 volt |
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| Configuration |
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| common |
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| Blower/Circulator fan | Menu selects |
| System | ||
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| “O” or “B” for | Power closed | ||||
| 24 volt | 24 volt | system |
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| energized on a call | status | |||
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| changeover | |||||||
Single Stage | operation, | Call for cool | Call for heat | for cool or Fan On | connection for | Indicator for | ||||
power for | power for | function. Set | ||||||||
| required for |
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| (also energized in | SPDT | sytems | ||||
| cooling | heating |
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| to “O” terminal | |||||
| remote |
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| heating if configured | zone valve | with “L” terminal | ||||
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| energized in Cool | |||||
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| sensor and |
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| for Electric Heat) |
| connection | ||
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| & Off mode. Set |
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| system status |
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| to “B” terminal |
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| indicator) |
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| energized in Heat |
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NEUTRAL |
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24VAC | 120VAC |
*Jumper Y to W required for heat pump systems not compatible with heat pump systems that | HOT |
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require an auxiliary heat output. |
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TRANSFORMER
Figure 3 – Single Stage System (No Heat Pump) with Two Transformers
Single Stage Connections
Refer to equipment manufacturers' instructions for specific system wiring information.
This thermostat is designed to operate a
This thermostat is configured for use with the following fossil fuel systems:
SINGLE STAGE gas, oil or electric.
System | RC | RH | C | Y | W | G | O | 6 | L |
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| Installer |
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| Configuration |
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| 24 volt |
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| Menu selects |
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| common | Heat |
| Blower/Circulator fan | “O” or “B” for | Power closed | System |
| 24 volt | 24 volt | (optional |
| energized on a call | changeover | status | ||
| stage, |
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Single | for system |
| for cool or Fan On | function. Set | connection for | Indicator for | |||
power for | power for | Cool | Call for heat | SPDT | |||||
Stage | cooling | heating | operation, | stage, |
| (also energized in | to “O” terminal | zone valve | sytems |
| required |
| heating if configured | energized in Cool | with “L” terminal | ||||
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| (Compressor) |
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| for remote |
| for Electric Heat) | & Off mode. Set |
| connection | |
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| sensor) |
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| to “B” terminal |
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| energized in |
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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 | 120VAC | 24VAC |
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HEATING |
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After wiring, see INSTALLER CONFIGURATION section for proper thermostat configuration.
| NOTE: If continuous backlight or | |
| hardwired power input are desired | |
| but do not function in both HEAT | |
| and COOL modes, cut the heating | |
| transformer 24V wires and tape off. | |
| Connect the neutral circuit discon- | |
| nected from the heating transformer | |
| to the neutral circuit of the cooling | |
| transformer. Disconnect the wire to | |
120VAC | the RH terminal and install a jumper | |
between RH and RC. Depending on | ||
COOLING | the system requirements, replace | |
the cooling transformer with a 75VA | ||
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CLASS II
CLASS II
class II transformer if needed. |
TRANSFORMER
TRANSFORMER
Figure 4 –
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| Jumper |
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6 | Y | W | G | RH RC | C |
System
Single Stage
Closes
Valve
(6)
Opens
Valve
(4)
Blower/Circulator
Fan Energized
24 Volt | 24 Volt | Constant |
24 Volt | ||
(Hot) | (Hot) | (Com- |
Heat | Cool | mon) |
(5) |
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NEUTRAL
24VAC
HOT
120VAC
CLASS II
TRANSFORMER
3
