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UNIT DESCRIPTION
ELECTRIC STANDBY (MODEL 50
UNITS ONLY)
The Electric Standby option allows the unit to
be operated on either the diesel engine or
external electric power.
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.
Overload Relay
The overload relay is self-resetting.
Hot Gas Heat
Hot gas heat is utilized on all units.
Automatic Phase Correction
The control system features two motor
contactors. This allows correct motor rotation
regardless of phase rotation on the incoming
power.
OPTIONAL MODEL 50 FEATURES
The following features are available as an
option on units equipped with Electric Standby.
• Electric Heater Strips
• Water Heat
ENGINE COMPARTMENT
COMPONENTS
Coolant Expansion Tank
The coolant level and temperature are
monitored by the base controller. If the coolant
temperature becomes too high or the level
becomes too low, an alarm will occur.
The engine must have antifreeze protection to –
–34 C (-30 F). Check and add coolant in the
expansion tank as needed.
Engine Oil Dipstick
Use the engine oil dipstick to check the engine
oil level.
Receiver Tank Sight Glass
The receiver tank sight glass is used to assist in
checking the amount of refrigerant in the
system.
Compressor Oil Sight Glass
The compressor oil sight glass is used to check
the relative level of compressor oil in the
compressor sump.
HIGH VOLTAGE AC POWER IS
PRESENT WHENEVER THE UNIT IS
OPERATING IN THE ELECTRIC
MODE AND WHENEVER THE UNIT
IS CONNECTED TO EXTERNAL
STANDBY POWER. VOLTAGES OF
THIS MAGNITUDE CAN BE LETHAL.
EXERCISE EXTREME CAUTION
WHEN WORKING ON THE UNIT.
CAUTION: Do not remove expansion
tank cap while the coolant is hot.
CAUTION: Do not add Green or
Blue-Green coolants to cooling
systems that use Red Extended Life
Coolants.
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