Installation Instructions

3
Y2
G
C
Y
A
Rc
W
K
W2
R
L/A
O/B
AUX
E
UWP Wiring terminal designations
L/A
- A
Not used for T1 thermostat.
O/B
Changeover Valve (TH1110D
only)
Y
Compressor contactor
(stage 1)
AUX -
W2
Not used for T1 thermostat.
Y2
Not used for T1
thermostat.
E Not used for T1 thermostat.
G
Fan Relay W Heat relay (stage 1)
C
24VAC common. For 2
transformer systems,
use common wire from
cooling transformer.
K Not used for T1 thermostat.
R
24VAC power from heating
transformer*
Rc
24VAC power from cooling
transformer*
Note: Not all
terminals may be
used, depending
on the system
type that is being
wired. The most
commonly used
terminals are
shaded.
* Terminal can be jumped using Slider Tab. See “Setting Slider Tabs” above.
Power options
Set R Slider Tab.
• Use built-in jumper (R Slider Tab)
to differentiate between one or two
transformer systems.
• If there is only one R wire, and it is
connected to the R, Rc, or RH terminal, set
the slider to the up position (1 wire).
• If there is one wire connected to the R
terminal and one wire connected to the Rc
terminal, set the slider to the down position
(2 wires).
NOTE: Slider Tabs for U terminals should be
left in place for T1 Pro models.
Setting Slider Tabs
Insert R and C wires into
designated terminals
for primary AC power (C
terminal is optional if
batteries are installed,
but it is recommended).
Remove wires by
depressing the terminal
tabs.
Insert AA
batteries for
primary or
backup power.
R/Rc Slider Tab
(built-in jumper)
UWP Mounting System