8
To remove filter, slide filter out of filter rack from either side
of return-air duct collar.
THROWAWAY OR PLEATED FILTER — Replace filter
with a good quality filter of the size shown in Table 1. Do not
attempt to clean and reuse a disposable filter.
Recommended Maintenance
Quarterly
• Lubricate motor and blower bearings (if applicable)
• Check and adjust belt tension
• Change air filter
Annually — in addition to quarterly maintenance
• Inspect all wiring connections and tighten if necessary
• Check and tighten set screws on pulleys
• Clean coil and drain pan
• Clean blower wheel as needed
TROUBLESHOOTING
Excessive Condensation on Fan Coil Unit
Parts —
Excessive condensation can be caused by running
chilled water through a fan coil unit with its fan off. If fan cy-
cling control is used, a water flow control valve should be in-
stalled to shut off the water when the fan stops.
The following two practices will also help avoid condensa-
tion problems:
1. Continuous fan operation with motorized chilled water
valve controlled by thermostat.
2. Continuous fan operation with thermostat control to
switch fan from high to low speed (instead of switching it
off).
Motor Overload — The following are causes and reme-
dies for motor trip-out on overload:
Cause: Fan delivers too much air because external stat-
ic pressure is lower than the design pressure.
Remedy: Reduce fan speed by adjusting motor pulley or
changing fan shaft pulley to larger diameter.
Cause: Air temperature across fan motor is too high
(heating mode).
Remedy: Check ambient temperature on motor’s name-
plate. Compare to actual air temperature at the
motor or at the fan discharge. If motor’s name-
plate lists an ambient temperature of 104 F and
the actual air temperature is higher, either low-
er the air temperature or obtain a special motor
rated for high ambient temperatures.
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