2
•
For 24 Volt AC power
, you must connect the common side of the trans-
former to the C terminal on the thermostat sub-base.
•
For primary or back-up power
, insert the 2 supplied “AA” type alkaline
batteries into the battery compartment located in the rear housing of the
thermostat. Make sure to position the Positive (+) and Negative (-) sides
of the batteries correctly with the +/- symbols in the battery compartment.
Provide Power
2
Connect Your Wires
3
1 HEAT / 1 COOL Single or Dual Transformer
Set Installer Switch to
CONV
Rh
24 Volt AC Power (heating transformer)
[note 2]
Rc
24 Volt AC Power (cooling transformer)
[note 2]
W1
Heat Relay (appears as
W1/E
on PRS3210)
Y1
Compressor Relay
G
Fan Relay
C
24 Volt AC Transformer Common
[note 1, 3]
Typical Wiring Configurations
NOTE:
The “Installer Switch” option will be configured in the next step.
Conventional Systems
NOTES - Conventional Systems
[1]
If batteries are installed the 24 Volt AC common connection is optional
[2]
Remove factory installed jumper for dual transformer systems
[3]
In dual transformer systems, transformer common must come from
cooling transformer
[4]
If needed for system
Provide disconnect and overload protection as required.
2 HEAT / 1 COOL Single or Dual Transformer
(PRS3210 Only)
Set System Type to
CONV
Rh
24 Volt AC Power (heating transformer)
[note 2]
Rc
24 Volt AC Power (cooling transformer)
[note 2]
W1
Heat Relay Stage 1
W2
Heat Relay Stage 2
Y1
Compressor Relay Stage 1
G
Fan Relay
C
24 Volt AC Transformer Common
[note 1, 3]
Heat Only or Millivolt
Set Installer Switch to
CONV
Rh
Power Connection
W
Heat Relay (appears as
W1/E
on PRS3210)
G
Fan Relay
[note 4]
C
24 Volt AC Transformer Common
[note 1]