3
S
S
Y
2
U
U
G
C
Y
A
Rc
W
K
W
2
R
L/A
O/B
AUX
E
Power options
Wiring terminal designations
S
Input for wired indoor
or outdoor sensors
(TH6320U and
TH6220U only)
L/A
- A
Heat Pump fault input
(Common (C) wire required
for LA/A)
S
O/B
Changeover valve
Y
Compressor contactor
(stage 1)
AUX -
W2
Auxiliary heat
Heat (stage 2)
Y2
Compressor contactor
(stage 2)
E
Emergency Heat
G
Fan
W
Heat (stage 1)
C
24VAC common. For 2
transformer systems,
use common wire from
cooling transformer.
K
Unused
U
Unused
R
24VAC power from heating
transformer*
U
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.
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 T6 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
UWP Mounting System
