PRO
3
TOP MOUNT PACKAGED REFRIGERATION SYSTEM
8
MEDIUM & LARGE CABINET FREEZERS
PRO
3
SERVICE INFORMATION
All PRO
3
units are designed for maximum durability,
reliability and simplicity. PRO
3
comes to you ready for
operation, fully charged and with all controls preset at the
factory. The following information is provided as an aid in
the event that service is required.
MAINTENANCE
The evaporator section of a PRO
3
system should be
checked at least once for proper defrosting because the
amount and pattern of frosting can vary greatly. The frost
build-up is dependent on the temperature of the room,
the type of product being stored, how often new product
is brought into the room and percentage of time the door
to the room is open. It may be necessary to periodically
change the number of defrost cycles or adjust the duration
of defrost.
PRO3 SYSTEM STANDARD MAINTENANCE GUIDELINES
After first year of operation and under normal usage,
maintenance should cover the following items at least
once every six months:
1. Check and tighten ALL electrical connections.
2. Check all wiring and insulators.
3. Check contactors for proper operation and for worn
contact points.
4. Check all fan motors. Tighten motor mount bolts/ nuts
and tighten fan set screws.
5. Clean the condenser coil surface.
6. Check the operation of the control system. Make certain
all safety controls are operating properly.
7. Check that all defrost controls are functioning properly.
8. Clean the evaporator coil surface.
9. Clean the drain pan and check the drain pan and drain
line for proper drainage.
REFRIGERATION SEQUENCE OF OPERATION
1. Power is provided to the temperature control,
compressor contactor and cooler evaporator fans.
2. The temperature controller closes and energizes
the compressor contactor, starting the compressor,
evaporator and condenser fan(s).
3. When the system reaches the desired box temperature,
the temperature control will de-energize the compressor
contactor. Evaporator fans will continue to operate at
this point.
4. When the fixture temperature rises above the set
point and minimum o-time has elapsed, the
temperature control will close and re-energize the
compressor contactor.
ELECTRIC DEFROST SEQUENCE OF OPERATION
FOR FREEZERS
1. During normal operation, at the preset time intervals,
the temperature/defrost control will de-energize the
compressor contactor and evaporator fans and energize
the defrost heaters. These functions are controlled
through relays on the controller.
2. When the coil has defrosted fully and has reached the
preset coil temperature (as sensed by the coil
temperature sensor) the defrost heater de-energizes
and the fan delay and drip sequences begin.
3. The temperature/defrost control energizes the
compressor contactor, starting the compressor and
condenser fan(s).
4. Freezer evaporator fans will be energized by the
temperature/defrost control when the coil temperature
reaches 35°F or fan delay time has elapsed.
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