Setting System Switch; Maintaining Your Thermostat; Installing Batteries - Honeywell T8112C Owner's Manual

Setting System Switch

System switching positions control thermostat
operation:
Cool: Thermostat controls air conditioning
system.
Off: Both heating and air conditioning systems
are off.
Heat: Thermostat controls heating system.
Fan
FAN SWITCH
AM
TU
LEAVE
Auto On System Cool Off Heat
SYSTEM
SWITCH
M5783

Maintaining Your Thermostat

Installing Batteries

IMPORTANT
Batteries must be installed for pro-
gramming and operation of the ther-
mostat and heating/cooling system.
1. Purchase two AA alkaline batteries; non-
alkaline batteries do not last as long and
can leak, causing damage to the thermo-
stat or wall surface.
2. Make sure the thermostat is set in the Off
position.
3. Use a coin to remove the battery door.
4. Install the fresh batteries, making sure
the positive and negative terminals are
oriented correctly.
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