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®
(Continued)
Jumper
X
X
Wallplate
Terminals
G
Rc Rh
Y
W
Fan
Relay
Heat Relay
or Valve
Heat 24V
Supply
Jumper
X
X
X
Wallplate
Terminals
W
G
Rh
Rc
Y
Heat 24V or
Millivolt Supply
Heat Relay
or Valve
Jumper
X
Wallplate
Terminals
Y
W
Rc
G
Fan
Relay
Rh
Cool
Contactor
Heat Relay
or Valve
24V Supply
Heat/Cool
No Jumper
Wallplate
Terminals
Rh
Rc
G
Y
W
Fan
Relay
Cool 24V
Supply
Cool
Contactor
Heat 24V
Supply
Heat Relay
or Valve
Jumper
X
X
Wallplate
Terminals
Cool
Contactor
Cool 24V
Supply
Fan
Relay
W
Y
RhRc
G
4-wire Heat/Cool System
3-wire Cool Only System
5-wire Heat/Cool System
2-wire Heat Only System
3-wire Heat Only System
Wiring Diagrams
X - No Connection
Selector Switches
In order for this thermostat to control your system, the system type must be specified by the
selector switches on the printed circuit board inside the thermostat.
■ Heating System Selector (HG - HE switch)
The factory position for this switch is in the “HG” position. Leave it in this position if you have
a gas furnace or an oil burner. If you have an electric furnace, test to see whether the Heat
and Fan come on as expected after installation. If the Fan operation is normal, leave it in the
“HG” position. If the Fan does not come on within a minute of the thermostat calling for heat,
change the switch position to “HE”. The system selector has no effect in the cooling mode.
NOTE: “HG” position is for gas and most other systems. “HE” position is for certain electric
systems having a fan relay.
■ Auto Recovery selector (DISABLE/ENABLE)
Your thermostat is set from the factory with the Auto Recovery Feature enabled, which com-
plies with the EPA ENERGY STAR
®
Program. If you prefer to use normal recovery, slide the
switch to the DISABLE position.
Figure 7
F˚ / C˚ Selection (Fahrenheit / Celcius)
Your thermostat is set for F˚ mode from the factory. To change to C˚ mode, follow these steps:
■ Press and hold the Up key.
■ Use a paper clip to press the reset key.
■ Once all the LCD segments turn on, release the Up key.
NOTE: To return to F˚ mode, press the reset key with a paper clip. Do not press any
other keys during the reset process.
All programs and settings will be lost when pressing RESET.
OPERATION
Setting Day and Time
■ The LCD will show this information when
batteries are first installed, or after the
Reset button is pressed. The temperature
will update after a few seconds.
■ During time and day setting mode, the
temperature and program displays will go
blank.
■ Example: Set the Thermostat to the current
time of 2:16 pm on Saturday. Refer to the
Steps below.
STEP 1:
■ Press to enter time and day setting mode.
The current hour and the AM / PM indica-
tor will be flashing.
■ Press to change the Hour up or down to
the current hour.
Note the AM / PM indicator, as the dis-
play will change at 12 AM and 12 PM.
STEP 2:
■ Press again to change from hour setting to
minute setting. The current minute will be
flashing.
■ Press to change the Minute up or down to
the current minute.
Fan Option
(SW6)
DISABLE ENABLE
HG HE
Auto Recovery
(SW4)
M
AM
4
TEMP
M
AM
day/time