WIRING DIAGRAM
O/BY
Changeover
G | W2 | C ** |
THERMOSTAT
L | R |
| SYSTEM |
SYSTEM |
|
MONITOR |
|
Relay*
Compressor
Contactor
Fan Aux/Emergency
Relay Heat Relay
(Stage 2)
SWITCH |
|
|
|
|
| |
|
|
|
|
|
| Hot |
24 VAC |
|
|
|
| ||
|
|
|
| |||
|
| |||||
|
|
|
| 120 VAC | ||
*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” position
**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” alkaline batteries.
Neutral
TRANSFORMER
(Class II Current Limited)
Figure 2. Typical wiring diagram for single transformer 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. 3). 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.
3SYSTEM switch (COOL, OFF, HEAT, EMER).
4FAN switch (ON, AUTO).
The Display
5Indicates 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.
6“AUX” indicates auxiliary stage is operating.
7“Save” indicates the Cool Savings feature is enabled in the configuration menu. “Save” (flashing) indicates Cool Savings feature is active.
8Flame 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 (
) is displayed 
) is displayed (flashing) if the thermostat is calling for cool.
9Displays current temperature.
10“Service” indicates a diagnostic fault in the heating/ cooling system. It does not indicate a fault in the thermostat.
11“EMER” is displayed flashing when the system switch is in EMER position.
12“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.
13“
” indicates when batteries are low and should be replaced.
Figure 3. Thermostat display, buttons and switches
1
2
3 |
| 4 |
|
13 |
|
| 5 |
12 |
|
| 6 |
|
|
| 7 |
11 | 10 | 9 | 8 |
3
