WIRING DIAGRAMS
Optional Jumper for
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Relay* |
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| Compressor |
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| Contactor |
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| Relay |
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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.
THERMOSTAT
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Limit or |
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| Safety |
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Safety |
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Switches |
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24 VAC |
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ACCESSORY |
| Heating |
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RELAY N.O. | Transformer |
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CONTACT |
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COMMON | circuits exist in both systems. | |||||||||||||||||
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TWO COMMONS MUST | Limit or |
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BE JUMPERED TOGETHER! | Safety |
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COMMON | Switches | 24 VAC |
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NEUTRAL
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” positionHeat Pump Transformer (Class II Current Limited)
Figure 4. Typical wiring diagram for two transformer single stage systems with safety circuits in BOTH systems
THERMOSTAT QUICK REFERENCE
Before you begin programming your thermostat, you should be familiar with its features and with the display and the location and operation of the thermostat buttons and switches (see fig. 5). Your thermostat consists of two parts: the thermostat cover and the base. To remove the cover, pull it straight out from the base. To replace the cover, line up the cover with the base and press until the cover snaps onto the base.
The Thermostat Buttons and Switches
1Raises temperature setting.
2Lowers temperature setting.
3TIME button.
4SYSTEM switch (COOL, OFF, HEAT, EMER).
5PRGM (program) button.
6FAN switch (ON, AUTO).
7RUN/HOLD (program) button.
The Display
8Indicates days of the week.
9Indicates setpoint temperature. This is blank when system switch is in the OFF position. Setpoint temperature is displayed (flashing) if the thermostat is in lockout mode to prevent the compressor from cycling too quickly.
10“Save” indicates the Cool Savings feature is enabled in the configuration menu. “Save” (flashing) indicates Cool Savings feature is active.
11Flame icon (
) is displayed when the SYSTEM switch is in the HEAT position. Flame icon (
) is displayed flashing when thermostat is calling for heat. Snowflake icon (
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) and is displayed (flashing) if the thermostat is calling for cool.
12Displays current temperature.
13“Service” indicates a diagnostic fault in the heating/cooling system. It does not indicate a fault in the thermostat.
14“Change Filter” is displayed when the system has run for the programmed filter time period as a reminder to change or clean your air filter.
15“
” indicates power level of batteries. “Change 
” indicates batteries should be replaced.
16Indicates time.
17“A” “P” indicates time as Morning (A) Evening (P).
18“Temp Hold”indicates temporary hold or “Hold” indicates hold mode.
Figure 5. Thermostat display, buttons, and switches
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