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 .
