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Inspection and Repair of Electrical System
Koldwave Technical Services Department must
be contacted prior to any repair/service on a unit
which is under warranty.
Service other than routine maintenance should be
performed only by a qualied refrigeration service
person.
Always disconnect power and discharge capacitors before
servicing.
Compressor and Fan Motor Capacitors
Visually check the capacitors for bulges or signs of leakage. Using
a capacitor tester, check each capacitor for shorts, grounds, or
leakage. Also verify the capacitance in mfd matches the capacitor
rating.
Inspection and Repair of Refrigerant System
Koldwave Technical Services Department must
be contacted prior to any repair/service on a unit
which is under warranty.
Service other than routine maintenance should be
performed only by a qualied
refrigeration service person.
Check all connections and every part for leaks whenever the
refrigerant system is repaired. Use a leak detector, soap solution,
or a halide torch to inspect the system.
When repairing a refrigerant leak, the brazing ame will cause
oxidation to occur inside the copper tubing being repaired.
It is therefore desirable to use a slightly reduced ame and to ow
dry nitrogen gas through the refrigerant piping while brazing to
prevent this oxidation from taking place. Once the repair is com-
pleted, thoroughly evacuate the refrigerant system with a vacuum
pump before recharging the system.
Koldwave strongly recommends a lter/dryer be
installed when any repairs are made to the refrig-
eration system.
Preventative Maintenance
Your Koldwave portable spot cooler has been designed to give
maximum performance and reliability with minimum mainte-
nance. Maintenance of the system is concentrated in three areas
covered in the following paragraphs.
Blower Motors
Caution: Always disconnect the power source before working on
or near a motor or its connected load.
e motor may require periodic cleaning to prevent the possibil-
ity of overheating due to an accumulation of dust and dirt on the
windings or on the motor exterior.
Filter
e life of a lter depends entirely on its environment and use.
It is recommended that air lters be inspected on a regular basis
every four to six weeks. A clogged lter will cause the unit to
operate at greatly reduced eciency. is unit employs one 1/2”
thick, washable aluminum mesh air lter located behind the lou-
vered front (evaporator) panel. e evaporator lter can easily be
removed and cleaned; pull down
the evaporator intake hinged door and pull the lter out. e
lters must be washed periodically when needed. is may be
done as follows:
1. Soak lter in solution of warm water and detergent for 15
minutes.
2. Rinse in clean, hot water and shake excess moisture from lter.
3. Spray one side of lter with light lm of oil.
4. Reinstall with oiled surface facing out from unit.
Coils and Related Items
Coil Maintenance:
e evaporator coil surfaces must be kept clean of dirt and lint in
order to operate at rated eciency. e coil should be inspected
on a regular basis and cleaned as required.
CAUTION: Solutions used to clean coils must not be corrosive
to metals or materials used in the manufacture of this equip-
ment. Take care to not damage the coil or ns if using a high
pressure spray to apply the cleaning solutions.
Condensate Pump
Caution: Always disconnect the power source before working
on or near the pump.
Pump Maintenance:
Do not touch or clean the sensor device with sharp objects or
tools. e sensor element is fragile so handle with care. Replace
the pump if damaged in any way. If servicing, clean carefully with
a so brush, cloth, or under a slow running tap. Rinse out the
tray thoroughly.
Unit Storage CAUTION:
If the unit is to be stored in an unconditioned space where it
will be exposed to freezing temperatures, all water must be
removed from the condenser coil prior to storage. Use 15 – 20
PSI of compressed air or nitrogen applied to the Water In (mid-
dle) connection. To do this turn the unit o. Shut o the water
supply. Disconnect the 3 hose manifold (Water Out, Water
In, Drain) from the unit. Place the unit in the Cooling mode.
Once the compressor starts and runs for 15 seconds,
blow any remaining water out of the condenser coil.
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