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Idiomas disponibles
Idiomas disponibles
Power options
A
L/A
O/B
Y
W
AUX
2
Y
2
E
G
W
K
C
R
Rc
M39345
Setting slider tabs
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).
Base plate wiring terminal designations
Compressor contactor
Y
(stage 1)
Y2
Not used
G
Fan
24VAC common. For 2
transformer systems,
C
use common wire from
cooling transformer.
* Terminal can be jumped using Slider Tab. See "Setting Slider Tabs" above.
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.
L/A
- A
O/B
AUX -
W2
E
W
K
R
Rc
Insert AA batteries for primary or
backup power.
Not used
Changeover valve
Auxiliary heat
(PSTSN21AWH Only)
Emergency heat
(PSTSN21AWH Only)
Heat (stage 1)
Not Used
24VAC power from heating
transformer*
24VAC power from cooling
transformer*
3
M39338
Base Plate
Mounting System
M39346
R/Rc Slider Tab
(built-in jumper)
M39347
Note: Not all
terminals may be
used, depending
on the system
type that is being
wired. The most
commonly used
terminals are
shaded.
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