47
FORM 145.18-IOM2
ISSUE DATE: 06/17/2020
3
SECTION 3 - MAINTENANCE
Unit maintenance is simplified by the following pre-
ventive suggestions:
1. At least once a month, visually inspect the unit.
Pay special attention to hose assemblies. Note any
signs of hose deterioration or cracking. Immedi-
ately attend to any sign of minor leakage.
2.
At least once every three months, perform filter
maintenance to ensure proper operation of the
equipment. Inspect the filters and replace when
visible dirt buildup is evident.
To avoid fouled machinery and extensive
unit clean up, DO NOT operate units
without filters in place or use the unit as a
temporary cooling/heating source during
construction.
3. Every three months, inspect the condensate drain
pan for algae growth and mineral buildup. Exces-
sive algae or mineral deposits in the drain pan or
drain line can result in condensate overflow and
unpleasant mildew odors.
4. Annually check the fan motor and blower assem-
bly. All units employ permanently lubricated fan
motors. DO NOT OIL FAN MOTORS. Vacuum
any accumulation of dirt from the motor ventila-
tion slots and the blower wheel.
5. Annually check the contactors and relays within
the control panel. Inspect the panel for any signs
of damage caused by overheated contacts or tem-
perature change to the wiring. Check the termi-
nals for tightness.
6. Annually conduct an amperage check on the com-
pressor and fan motor. An amperage draw more
than 10% higher than the nameplate values can
indicate heat exchanger fouling, low water flow,
or premature physical motor failure.
7. At least once a year, inspect the air-to-refriger-
ant heat exchanger surface. A dirty or partially
clogged coil can significantly reduce operat
-
ing capacity and can result in serious equipment
problems. If the coils appear dirty, clean them us-
ing mild detergent or a commercial coil-cleaning
agent.
8. Inspect hoses, valves, and connections for water
leaks. For hose connection leaks, inspect rubber
hose gaskets and replace them as required.
