Sterling ME User Manual

Page 17

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SEASONAL MAINTENANCE
The unit should be thoroughly checked before the start
and at the end of each heating and cooling season.

A. Motors and belts should be inspected.

B. Tighten belts if loose.

C. 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).

D. Check air throughput at beginning of heating season

to confirm unit operation is within the specified
temperature rise range.

E. 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 fi ll
P-trap with a non-toxic glycol solution.

F. Evaporative cooler must be cleaned and maintained

per manufacturer’s instruction frequently during the
operating season.

G. Inspect Control Dampers during periodic maintenance.

Damper pivot points should be cleaned to ensure free
damper operation.

H. Blower wheels should be checked periodically for dirt

build-up on blades. Clean as required.

FILTERS
The fi lter section has been designed to incorporate (as
standard) one-inch washable fi lters. Other optional fi lter
types are also available: two-inch washable throwaways;
or one or two inch hi-effi ciency 30% pleated fi lters.

It is recommended that air fi lters be changed or cleaned
at least four times a year. More frequent attention to fi lters
is required if the air being handled by the unit is unusually
dirty. Air fl ow reduction, caused by the dirty air fi lters, 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, fi lters
may clog up in less than one month.

Standard CFM Blower Air Filter Size Requirements

Number of Filters Required

Unit Input

16 x 20 (in)

20 x 20 (in)

100 MBH (29.3 kW)

150 MBH (44.0 kW)

200 MBH (58.6 kW)

250 MBH (73.2 kW)

300 MBH (87.9 kW)

350 MBH (102.6 kW)

400 MBH (117.2 kW)

500 MBH (146.5 kW)

600 MBM (175.8 kW)

700 MBM (205.1 kW)

800 MBH (234.4 kW)

High CFM Blower Air Filter Size Requirements