McQuay MWSC 010 Series Manual page 50

Maintenance
1. Normal maintenance on all conditioners is generally limited to fi lter changes. Lubrication of the fan motor is not
required but may be performed to extend motor life. Use sae-20 non-detergent electric motor oil.
2. Filter changes are required at regular intervals. The time period between changes will depend upon the project
requirements. Some applications such as motels produce a lot of lint from carpeting and linen changes, and will
require more frequent fi lter changes. It is suggested that the fi lter be checked at 60-day intervals for the fi rst year
until experience is acquired. If light cannot be seen through the fi lter 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 fl ushed as requirement. 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 indicator of
general equipment condition.
5. Periodic lockouts almost always are caused by air or water problems. The lockout (shutdown) of the conditioner
is a normal protective result. Check for dirt in the water system, water fl ow rates, water temperatures, airfl ow
rates (may be dirty fi lter), 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.
Do not charge oxygen, acetylene or other fl ammable and poisonous gases into the unit when performing
a leakage test and air tighten test. These gases could result severe explosion and damage if in the
high temperature and pressure. It is recommended that only nitrogen or refrigerant be charged when
performing the leakage or air tighten test.
Caution !
Page 49