Saswell T21HTW-0 - Battery Operation and Wiring Diagram; Battery Operation Details; Wiring Diagram

7
BATTERY OPERATION
With two “AA” batteries installed, your thermostat will maintain time and continuously display the temperature during a
loss of AC power. The LCD Backlight will not function when AC power is lost.
If the battery icon on the display is flashing, it indicates that the batteries need to be replaced. When the thermostat is
powered only by battery, the battery icon will flash for approximately 2 months before the batteries are expected to
expire.
WIRING DIAGRAM
C
For 24VAC primary
power connect common
side of transformer
to C terminal
,
" " .
Cool relay
Changeover
valve
Emergency
Heat Relay
Auxiliary
Heat Relay
Fan Relay
Power Supply
24V live wire
Equipment
Monitor
Figure 2