IM 742 / Page 27
General Maintenance
1. Normal maintenance on all conditioners is generally lim-
ited to filter changes. Motors used with WSHP unit size
007 through 070 are provided with permanently lubricated
motors and require no oiling even though oil caps may be
provided.
2. Filter changes are required at regular intervals. The time
period between changes will depend upon the project
requirements. Some applications such as motels pro
-
duce a lot of lint from carpeting and linen changes, and
will require more frequent filter changes. It is suggested
that the filter be checked at 60-day intervals for the first
year until experience is acquired. If light cannot be seen
through the filter when held up to sunlight or a bright light,
it should be changed. A more critical standard may be
desirable.
3. The condensate drain pan should be checked annually
and cleaned and flushed as required.
4. Recording of performance measurements of volts, amps,
and water temperature differences (both heating and
cooling) is recommended. A comparison of logged data
with start-up and other annual data is useful as an indica-
tor of general equipment condition.
5. Periodic lockouts almost always are caused by air or
water problems. The lockout (shutdown) of the condi
-
tioner is a normal protective result. Check for dirt in the
water system, water flow rates, water temperatures,
airflow rates (may be dirty filter), and air temperatures. If
the lockout occurs in the morning following a return from
night setback, entering air below machine limits may be
the cause.
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