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• 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 power loss (up to 12
hours). When power is restored to the
system, heaters in the system will begin to
heat the crankcase oils. The thermostat’s
time delay will lock out the compressor to
prevent its operation until the compressor
oil is sufficiently warmed. During the lock-
out time period, the auxiliary heating sys-
tem will operate to maintain setpoint tem-
perature.
For example, if a power outage of three
hours occurs, the compressor will be locked
out for two hours.
• SYSTEM INDICATOR LIGHTS — The
four lights on the upper right part of the
thermostat indicate system operation (see
PARTS OF THE THERMOSTAT for spe-
cific descriptions of what each light indi-
cates).
• PROGRAMMABLE BLOWER CON-
TROL — You may program the fan blower
to run continuously during any given pro-
gram period, regardless of the cycling of
the heating or cooling system. During pro-
gramming, after entering the time and tem-
perature for the time period, press
FAN
SWITCH
until FAN is displayed. To override con-
stant fan, press until FAN is displayed.