38
MUA-SVX003B-EN
8. Remove any dirt, dust or other foreign matter from the burners using a wire brush and/or
compressed air. Insure all parts of the burner are unobstructed. Inspect and clean pilot burner
if necessary.
9. Reassemble the duct furnace by replacing all parts in order.
10. Light unit per the unit lighting instructions.
11. Check the burner adjustment. See the Primary Air Adjustment section of this manual.
12. Check all gas control valves and pipe connections for leaks.
WWAARRNNIINNGG
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13. Check the operation of the duct furnace gas valve by lowering the setting of the thermostat,
stopping the operation of the duct furnace. The duct furnace gas valve should close,
extinguishing the pilot and main burner flames.
14. Inspect and service the blower section of the system.
RRoouuttiinnee MMaaiinntteennaannccee
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
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. High CFM Blower Air Filter Size Requirements
Unit Input
Number of Filters Required
16 x 20 (in) 20 x 20 (in)
200 MBtuh (58.6 kW)
8
MMaaiinntteennaannccee
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