MK/MV – Medium Profile Series Unit Coolers (E206993_M)
55
11
PREVENTATIVE MAINTENANCE
A preventative maintenance schedule should be set up as soon as the Unit Cooler is installed.
The unit should be inspected periodically for proper operation.
WARNING - All power must be disconnected before cleaning.
1.
Inspect and clean the drain pan to insure free drainage of condensate. The drain pan
should be cleaned regularly with warm water and soap.
2.
The cabinet, fans and guards can be cleaned with warm water and soap.
3.
The evaporator coil should be checked once a month for proper defrosting. Many variables
affect coil frosting such as room temperature, type of product being stored, how often new
product is brought in and the length of time the door to the room remains open. Summer
conditions of high humidity can cause heavier frost loads. It may be necessary to change
the numbers of defrost cycles seasonally.
4.
At least every six months check all fan motors. Tighten motor mounting screws and fan
set screws.
12
TROUBLESHOOTING CHART
Table 16 UNIT TROUBLESHOOTING CHART
PROBLEM
POSSIBLE CAUSES
CORRECTIVE ACTION
Fans will not operate.
Unit not wired properly.
Defective motor.
Defective defrost timer,
termination thermostat or fan
delay switch.
Room temperature too high
for use of fan delay switch.
Check wiring.
Replace motor.
Replace defective component.
Jumper fan delay switch.
Terminals F to B.
Ice forming on ceiling.
Steaming during defrost.
Too many defrosts per day.
Defective termination
Thermostat or defrost timer.
Observe frost build up on coil,
change to fewer defrost per day.
Replace defective component.
Excessive buildup of
frost on coil.
Too few defrost times.
Defrost cycle too short.
Too high humidity in cooler.
Add more defrost cycles to timer.
Extend defrost time on timer.
Limit access to cooler, do not prop
doors open during stocking.
Accumulation of ice in
drain pan.
Drain line plugged.
Defective heater.
Clean drain line. Make sure drain
line is insulated properly.
Replace heater.