S:\Koldwave\Kompac 4-Series IOM
Koldwave 4830 Transport Drive Dallas, Texas 75247
www.koldwave.com
www.mestekparts.com
17
INSPECTION AND REPAIR OF
ELECTRICAL SYSTEM
Always disconnect power and discharge
capacitors before servicing.
High and Low Pressure Switch
Check for continuity across terminals 1 and
2 of the pressure switch. At normal pressure
when the unit is not operating, there is
continuity across the two terminals. If
continuity is interrupted across the
terminals, replace the pressure switch.
Compressor Overload Relay
Check for continuity across the overload
relay’s two terminals. At normal room
temperatures, there is continuity across the
two terminals. If no continuity exists,
replace the overload relay.
Compressor and Fan Motor Capacitors
Check visually for bulges or signs of
leakage. A capacitor tester is recommended.
This instrument checks for an open
capacitor, shorts, leaks, grounds, and also
gives direct capacitor reading in mfd.
Inspection and Repair of Refrigerant
Attentively check all connections and every
part for leaks whenever the refrigerant
system is repaired. Use a leak detector or
the halide torch to inspect the system.
When repairing a refrigerant leak, the
brazing flame will cause oxidation to occur
inside the copper tubing being repaired. It is
therefore desirable to use a slightly reduced
flame and to flow dry nitrogen gas through
the refrigerant piping while brazing to
prevent this oxidation from taking place.
Once the repair is completed, thoroughly
evacuate the refrigerant system with a
vacuum pump before recharging the system.
Service Procedures
Before troubleshooting this system, read this
manual to determine electrical power and
installation requirements to allow the spot
cooler to perform at its maximum efficiency.
Refer to general description, wiring
diagrams and photographs to get an
understanding of how the unit functions.
Service other than routine maintenance
should be performed only by a qualified
refrigeration service person. In
service/troubleshooting, there is no
substitute for a good understanding of the
Koldwave modes of operation and control
systems.
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