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2. Freezers
Service Information
All units are designed for maximum durability, reliability
and simplicity. comes to you ready for operation, fully
charged and with all controls preset at the factory. Instructions
for setting the proper time of day on the freezer defrost/
temperature control are on page 11, steps 1 through 6. The
following information is provided as an aid in the event that
service is required.
Maintenance
The evaporator section of a 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.
System Standard Maintenance Guidelines
After first year of operation and under normal usage, mainte
-
nance 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.
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 off-time has elapsed, the temperature
control will close and re-energize the compressor
contactor.
Freezer Defrost Control -
Med. & Large Cabinet
Freezer units utilize an electronic temperature/defrost control.
This control is fully preprogrammed for temperature and
defrosts. Instructions for any necessary reprogramming are
included in this manual on page 11-13.
Any of the parameters can be modified and the changes will
be stored in the non volitile memory. A capacitor is used to
maintain the time-of-day for up to 100 hours during power
outage.
Electric Defrost Sequence of Operation
for Freezers
1. During normal operation, at the preset times of day, 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.
Programming 's Electric Defrost
Controls
's electric defrost control factory settings can be found on
page 4 of this manual.
The control panel initially powers up displaying 12:00 AM
otherwise it will show the last configured selection (time
or temperature). If a power outage occurs during normal
operation, the control will maintain the correct time-of-day up to
100 hours.
To initiate a
Manual Defrost, press and hold the MAN DEF
key for 3 seconds.
There are two levels of programming in the controls. The first
level of security will enable the user to set two parameters:
- Time-of-day (CLoC)
- Setpoint temperature (SEt)
The other level allows access to the other parameters.
Three buttons are used for the programming:
SET, UP and DOWN.
Medium and Large Cabinet Freezers