32
MUA-SVX005B-EN
4. Complete appropriate start-up procedure as given in the Start-Up section of this manual.
5. Check Burner Adjustment.
6. Check gas control valves and pipe connection for leaks.
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7. Check operation of auto gas valve.
8. Check operation of safety devices.
9. Inspect and service blower section of system.
Seasonal Maintenance
The unit should be thoroughly checked before the start and at the end of each heating and
cooling season:
1. Motors and belts should be inspected.
2. Tighten belts if loose.
3. Check and clean DX or Chilled Water coil twice yearly, if unit is so equipped per
manufacturer’s service manual. Chilled Water coil must be winterized at beginning of heating
season (i.e. drain water from coil per manufacturer’s instructions).
4. Check air throughput at beginning of heating season to confirm unit operation is within the
specified temperature rise range.
5. At beginning of heating season clear Condensate Drain Pan and P-trap of water if unit is
equipped with DX or Chilled water coil. Clean out drain pan and fill P-trap with a non-toxic
glycol solution.
6. Evaporative cooler must be cleaned and maintained per manufacturer’s instruction
frequently during the operating season.
7. Inspect Control Dampers during periodic maintenance. Damper pivot points should be
cleaned to ensure free damper operation.
8. Blower wheels should be checked periodically for dirt build-up on blades. Clean as required.
Filters
• The filter section has been designed to incorporate (as standard) one-inch washable filters.
Other optional filter types are also available: two-inch washable throwaways; or one or two
inch hi-efficiency 30% pleated filters.
• It is recommended that air filters be changed or cleaned at least four times a year. More
frequent attention to filters is required if the air being handled by the unit is unusually dirty.
Air flow reduction, caused by the dirty air filters, will increase the discharge air temperature
and may cause unit cycling on the primary limit.
• Filters (by others) should be serviced regularly and changed or washed when necessary to
maintain the required air throughput. In a dusty environment, filters may clog up in less than
one month.
Table 3. Standard CFM Blower Air Filter Size Requirements
Unit Input
Number of Filters Required
16 x 20 (in) 20 x 20 (in)
100 MBtuh (29.3 kW)
4
150 MBtuh (44.0 kW)
4
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