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Technical Data
L
R
C
24 VAC
120 VAC
Hot
SYSTEM
MONITOR
SWITCH
Neutral
THERMOSTAT
SYSTEM
G W2
Figure 2. Typical wiring diagram for single transformer systems
TRANSFORMER
(Class II Current Limited)
Changeover
Relay*
YO/B
Compressor
Contactor
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.
Aux/Emergency
Heat Relay
(Stage 2)
Fan
Relay
**
*
**
L
R
C
24 VAC
120 VAC
Hot
SYSTEM
MONITOR
SWITCH
Neutral
THERMOSTAT
SYSTEM
G W2
Figure 2. Typical wiring diagram for single transformer systems
TRANSFORMER
(Class II Current Limited)
Changeover
Relay*
YO/B
Compressor
Contactor
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.
Aux/Emergency
Heat Relay
(Stage 2)
Fan
Relay
**
*
**
THERMOSTAT APPLICATION GUIDE
Thermostat
Configuration
Options
Thermostat
Applications
Maximum
Stages
Heat/Cool
Heat Pump 1
Single Stage
Compressor Heat
Pump (HP)
Single Stage Compres-
sor Heat Pump Systems
- with Aux./Emergency
Heat
2/1
Specifications
Electrical Rating:
Battery Power or Hardwire ................................. 20 to 30 VAC, 50/60 Hz or DC
Terminal Load ............................................................ 1.5 A per terminal, 2.5 A maximum all terminals combined
Setpoint Range .......................................................... 45° to 90°F (7° to 32°C)
Differential Fast Slow
Heat Pump ......................................................... 1.2°F 1.7°F
Aux./Emer Heat .................................................. .8°F 1.2°F
Operating Ambient ..................................................... 32° to +105°F (0° to +41°C)
Operating Humidity .................................................... 90% non-condensing max.
Shipping Temperature Range .................................... -40° to +150°F (-40° to +65°C)
Dimensions Thermostat ............................................. 3-3/4” H x 4-3/4” W x 1-1/2” D
ATTENTION!
This product does not contain mercury. However, this product
may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do
not touch any spilled mercury. Wearing nonabsorbent gloves,
take up the spilled mercury and place into a container which
can be sealed. If a cell becomes damaged, the unit should be
discarded.
Mercury must not be discarded in household trash. When the
unit this product is replacing is to be discarded, place in a
suitable container. Refer to www.white-rodgers.com for location
to send the product containing mercury.