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• AUDIO PROMPTING — Each time you
press a button, the thermostat will beep (this
feature works only when the thermostat is
attached to the wall and 24vAC power is
present to the thermostat).
• BACKLIT DISPLAY — When you press
any button on the thermostat, the display is
lit for approximately eight seconds (this fea-
ture works only when the thermostat is
attached to the wall and 24vAC power is
present to the thermostat).
• SYSTEM INDICATOR LIGHTS — The four
lights on the upper right part of the thermo-
stat indicate system operation (see PARTS
OF THE THERMOSTAT).
• COMPRESSOR SHORT CYCLE PROTEC-
TION — To protect your compressor from
potential damage due to rapid cycling, this
thermostat has a built-in delay of 5 minutes
between heat pump heating and cooling
cycles. The following may cause a time
delay in COOL:
a) Return of power after a power outage.
b) Pressing
SYSTEM
SWITCH
to change operating
modes.
c) Pressing or , creating a call
for HEAT or COOL too soon after a
previous call.
• COMPRESSOR LONG TERM CYCLE
PROTECTION — If your system begins to
operate too soon after an extended power
outage, the compressor may be damaged
due to crankcase oil temperature change.
This thermostat has a built-in time delay of
one hour less than the length of the power
loss (up to 12 hours). When power is re-