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20
COOLING SYSTEM OPERATION
To prevent compressor and/or property
damage, if power to the compressor has
been off or interrupted for more than 1
hour and the outdoor temperature is be-
low 50
°F, DO NOT operate the system for
at least the amount of time the compres-
sor was off! This will allow the compres-
sor heaters to warm the compressor oils
to avoid damage due to slugging.
1. Press
SYSTEM
HEAT-OFF-COOL-AUTO
until COOL is displayed.
2. Press to adjust thermostat to 40°F. The
cooling system should come on within approxi-
mately five minutes. However, if the fan is run-
ning but the compressor is not, the compressor
lockout feature is operating (see Lockout By-
pass Option to temporarily override the com-
pressor lockout feature during testing).
3. To program the thermostat, see PROGRAM-
MING YOUR THERMOSTAT.
After heating and cooling system have been checked
and are running properly, determine if automatic
changeover is desired. When option switch #4 is in
the proper position, automatic changeover is en-
abled by pressing
SYSTEM
HEAT-OFF-COOL-AUTO
until AUTO is displayed
(see SET OPTION SWITCHES). In the AUTO mode,
the setpoint temperature is not displayed.
CAUTION
!