µP-T System Description (Rev. 04/03)
21
to a power outlet. Under these conditions, when the micro-
processor power switch is turned on and the O
N key is
pressed, the unit will start and run on diesel automatically.
CAUTION: Electric operation mode is not stored in
the controller if the microprocessor power switch is
turned O
FF. Turning the switch back ON again, even with
the power cord connected, will not assure start up in Elec-
tric Standby. If the voltage is low or an electric phase is
missing, the Electric icon will not be present in the display
and the unit will start in diesel.
Standard Model 50 Features
The following features are standard equipment on units
equipped with Electric Standby.
• Automatic Diesel/Electric Selection—The unit will
automatically switch to electric operation when a
power cord is connected and the standby power is
switched ON.
• Phase Lockout (Three Phase Units Only)—If the
motor rotation is reversed as a result of incorrect phase
rotation, the unit will shut down and generate an Alarm
Code 38. The phase rotation must be manually cor-
rected.
• Remote Reset Solenoid—A remote reset solenoid is
provided to reset the overload relay.
• Hot Gas Heat—Hot gas heat is utilized on standard
model 50 units.
Optional Model 50 Features
The following features are available as options on units
equipped with Electric Standby.
• Automatic Phase Correction Option (Three Phase
Units Only) - The control system features two motor
contactors. This allows correct motor rotation regard-
less of phase rotation on the incoming power.
• Electric Heat Option - The unit is equipped with a
heater contactor and electric evaporator heaters. These
heaters provide supplemental heat during electric mode
heat and defrost operation.
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