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COLD WALL EVAPORATOR
MILK COOLERS
Installation, Operation and
Maintenance Instructions
INSPECTION
When the equipment is received, all items should be carefully checked against the bill of
lading to insure all crates and cartons have been received. All units should be inspected
for concealed damage by uncrating the units immediately. If any damage is found, it
should be reported to the carrier at once, and a claim should be filed with the carrier. This
equipment has been inspected and tested in the Nor-Lake Manufacturing Facility and has
been crated in accordance with transportation rules and guidelines. Manufacturer is not
responsible for freight loss or damage.
INSTALLATION
GENERAL
After the unit crate and base have been removed, locate the casters or legs found in the
interior of the cabinet. Attach the casters to the unit base by screwing them into the same
threaded fittings that were used to secure the crate base to the cabinet. Insure that the
casters or legs are screwed all the way into the base.
LOCATION
The self contained refrigeration system located at the bottom of the cabinet requires free air
access for proper operation. The back of the cabinet may be positioned against a wall,
however, there must be a minimum four inch clearance between the sides and a wall.
These guidelines must be followed for cabinets with casters or legs.
10/08 004728 Rev. B
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ELECTRICAL
Check the proposed outlet to be used to insure that the voltage, phase, and current
carrying capacity of the circuit from the electrical panel correspond to the requirements of
the cabinet. NEVER use an extension cord to power any unit. All inter wiring between the
electrical panel and the unit must be done in accordance with the National Electric Code
and all state and local codes. Refer to the Serial Tag for all pertinent electrical information.
Observe all Warning Labels. Disconnect power supply to eliminate injury from
electrical shock or moving parts when servicing equipment.
GENERAL OPERATION
The milk coolers are cooled entirely by convection as a result of copper coils completely
encircling the perimeter of the storage compartment. During the refrigeration process, heat
is removed through the evaporator tubing and expelled through the condensing unit. It is
important that the flow of air through the side louvers is not restricted in order to ensure the
condensing unit operates properly. Under normal operating conditions, any frost that might
accumulate on the walls during the "on" cycle of the condensing unit may melt during the
"off" cycle. Drains are installed in all milk coolers to accommodate melting frost.
The refrigeration system on this cabinet uses a temperature thermostat that senses the cutÂin and cut-out temperatures of the cold wall evaporator coil. The temperature can be
adjusted by turning the thermostat control knob which is located behind the louvered side
panel.
GENERAL MAINTENANCE
PERIODIC CLEANING
Beginning with the initial installation, the interior surfaces of the cabinet should be
periodically wiped down with a solution of warm water and baking soda. This solution will
remove any odors from spillage that has occurred. The exterior of the cabinet should also
be cleaned frequently with a commercial grade glass cleaner or with mild soap and water.
Never, under any circumstances, use an abrasive cleaner or alkaline solution.
Monthly cleaning of the condenser will aid the heat transfer characteristics of the
refrigeration system and increase its efficiency. To accomplish this, remove the louvered
panel from the cabinet and use a wire brush to loosen any dirt particles that are attached to
the fins. After this is accomplished, use a vacuum cleaner to remove the loosened
particles.
All moving parts have been permanently lubricated and will generally require no
maintenance.
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MAINTENANCE SERVICE AND ANALYSIS GUIDE
REFRIGERATION SYSTEMS - ALL MODELS
MALFUNCTION POSSIBLE CAUSE SOLUTION
Compressor will not start - 1. Service cord unplugged 1. Plug in service cord
no hum 2. Fuse blown or removed 2. Replace fus e
3. Overload tripped 3. Determine reasons and correct
4. Control stuck open 4. Repair or replace
5. Wiring incorrect 5. Check wiring against the diagram
Compressor will not start - 1. Improperly wired 1. Check wiring against the diagram
hums but trips on overload 2. Low voltage to unit 2. Determine reason and correct
protector 3. Starting capacitor defective 3. Determine reason and replace
4. Relay failing to close 4. Determine reason, correct or replace
Compressor starts and runs, 1. Low voltage to unit 1. Determine reason and correct
but short cycles on overload 2. Overload defective 2. Check current, replace overload protector
protector 3. Excessive head pressure 3. Check ventilation or restriction in
refrigeration system
4. Compressor hot-return gas hot 4. Check refrigerant charge, fix leak if
necessary
Compressor operates long 1. Short of refrigerant 1. Fix leak, add charge
or continuously 2. Control contact stuck 2. Repair or replace
3. Evaporator coil iced 3. Determine cause, defrost manually
4. Restriction in refrigeration system 4. Determine location and remove restriction
5. Dirty condenser 5. Clean condenser
Compressor runs fine, but 1. Overload protector 1. Check wiring diagram
short cycles 2. Cold control 2. Differential too close - widen
3. Overcharge 3. Reduce charge
4. Air in system 4. Purge and recharge
5. Undercharge 5. Fix leak, add refrigerant
Starting capacitor open, 1. Relay contacts stuck 1. Clean contacts or replace relay
shorted or blown 2. Low voltage to unit 2. Determine reason and correct
3. Improper relay 3. Replace
Relay defective or burned out 1. Incorrect relay 1. Check and replace
2. Voltage too high or too low 2. Determine reason and correct
Refrigerated space too warm 1. Control setting too high 1. Reset control
2. Refrigerant overcharge 2. Purge refrigerant
3. Dirty condenser 3. Clean condenser
4. Evaporator coil iced 4. Determine reason and defrost
5. Not operating 5. Determine reason, replace if necessary
Standard temperature system 1. Control setting is too low 1. Reset the control
freezes the product 2. Control points stuck 2. Replace the control
Objectionable noise 1. Fan blade hitting fan shroud 1. Reform or cut away small section of shroud
2. Tubing rattle 2. Locate and reform
3. Vibrating fan blade 3. Replace fan blade
4. Condenser fan motor rattles 4. Check motor bracket mounting, tighten
5. General vibration 5. Compressor suspension bolts not loosened
on applicable models - loosen them
6. Worn fan motor bearings 6. Replace fan motor
Pan Area 1. No cooling 1. Make sure switch is in the "on" position
2. Too cold 2. Adjust temperature control - see instructions
under pan area
3. Too warm 3. Adjust temperature control - see instructions
under pan area
10/08 004728 Rev. B
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