Service And Maintenance; Maintenance Schedule; Troubleshooting - McQuay M5WM Series Installation And Maintenance Manual

Service and Maintenance

CAUTION
!
Disconnect the electrical
performing any

troubleshooting.

Maintenance Schedule

Item Maintenance Procedures
Indoor Air
Lift the return air grille and
Filters remove the filters (See
Figure 23). Clean the filters
by using a vacuum cleaner
or wash in lukewarm water
and soap. Rinse and dry
before reinstalling.
Indoor Remove any dust on the
Cabinet grille or panel by wiping it
with a soft cloth soaked in
lukewarm water (below
40ºC / 104ºF) and a mild
detergent.
Outdoor
Clean the louvers and coil.
Unit Be careful not to bend or
flatten the aluminium fins.
DO NOT use cleaning
fluids that might corrode
the coil.
Page 26
power supply
service, maintenance
Frequency
As required to
prevent restriction
of air flow.
As required to
maintain
appearance.
As required to
prevent restriction
of air flow.
Troubleshooting
If any malfunction of the unit is noted, immediately switch
off the power supply.
Check the following chart for possible causes/treatments.
before
or
If the trouble
dealer/serviceman.
Trouble
The compressor
does not operate.
Fans and
compressor do not
operate.
Air flow too low or
insufficient
cooling/heating
capacity.
Discharge air flow
has bad odor.
Condensation on the
return air grille of the
indoor unit.
Condensate leaking
into room.
Hissing sound from
the unit during
operation.
persists, please call
Possible Cause/Treatment
Protection against frequent
starting. Wait for 3 to 4 minutes
for the compressor to start
operating.
Power failure.
Check fuse or circuit breaker.
Power supply disconnect off.
Delay timer may be set
incorrectly. Adjust timer setting
by using remote controller.
Dirty air filters.
Open doors or window.
Adjust thermostat setting.
Smoke, perfume, etc. may
have collected on the indoor
coil.
Clean coil.
Use dry mode. High humidity in
conditioned space.
Set temperature too low.
Increase temperature setting
and operate unit at high fan
speed.
Condensate drain plugged.
Refrigerant fluid flowing into the
evaporator coil. Operate for a
while to see if sound goes
away.
IM-5WMF(SEER13)-0706
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