Special Features; Dry Mode; Heat Mode (Heat Pump Only); Air Flow Control - McQuay M5WM Series Installation And Maintenance Manual

Special Features

Dry Mode

• Select this mode when the standard Cool mode does
not provide sufficient dehumidification. The compressor
and indoor low fan will cycle together and will operate
for longer periods of time to provide the increased rate
of dehumidification. As a result, the room temperature
differential may increase slightly.

Heat Mode (Heat Pump Only)

• When the unit is switched on from cold start or
defrosting cycle, the indoor fan will start to operate only
after the indoor coil becomes warmer.
• When the set temperature is achieved, the indoor fan
will stop as the indoor coil starts to cool.

Air Flow Control

• For more effective air circulation, you can manually
adjust the air discharge grille to the left or right.
• During cool and dry mode operation, do not direct the
air discharge louver downwards as it may cause
condensate to drip. (See figure 24).

Hot Keep (For Heat Pump Only)

• With the Hot Keep switch OFF, the indoor fan will stop
when coil temperature drops to 86ºF. With the switch
ON, the fan will not stop unless coil temperature drops
below 65ºF. With the switch in INTERNAL, and the unit
is not heating, the fan is on for 30 seconds and off for 2
min. (See Figure 24).
• In cool mode, fan runs continuous at selected speed.
• The switch is located on front of the indoor unit, above
the ON/OFF switch (See Figure 24).
Figure 24
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Overheating Protection (Heat Pump Only)

• If the indoor coil temperature exceeds 145ºF because
of high ambient conditions, dirty air filter, etc., the
compressor will turn off.

Frost Prevention

• If the indoor coil starts to frost in cooling mode, the
compressor will stop.
• If the outdoor coil becomes frosted, heating will stop for
a few minutes while the unit goes into defrost.

Fan Speed and Rated Cooling Capacity

• The rated cooling capacity is provided at the maximum
fan speed.
• The cooling capacity is slightly lower when the unit is
operating at MEDIUM and LOW fan speed.
Main Filters – Permanent and Washable
Air filters must be cleaned at regular intervals. Twice
annually may be adequate in some areas, while twice
monthly may be required in others. Areas with high dirt
and lint content or heavy usage of units require more
frequent filter maintenance than those areas of relatively
clean operating or low usage conditions. Unit malfunction
will occur if air filters are not kept clean. Vacuum the
filters from the dirty side or wash with hot water and a
mild detergent. Allow the filters to dry thoroughly before
replacing them. See Figure 25.

Electrostatic Air Purifying Filter

Pre-charged electrostatic polypropylene filter removes
microscopic dust, smoke and small invisible particles to
keep the room air clean.

Deodorizing Filter

Activated carbon filter removes unwanted smells and
odors in the air and keeps the room air fresh.
IM-5WMF(SEER13)-0706