Sophomore Series 4000 & 5000 Cabinet - Classroom Air Handler - Owner's Manual - Installation, Operation, and Service Instructions
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4.3 Filter Maintenance
Filtering Out Trouble
Dirty air filters will cause air flow reduction through your unit. If excessive air loss occurs, the unit may freeze up when in the air
conditioning mode, or cycle on high and limit safety controls during heating mode. If this condition persists the unit may be locked
out by the safety circuits.
Each unit will be equipped with either 1”, 2” disposable pleated filters or a 1/4” washable filter, or a combination of washable and
disposable filters.
Cleaning or Changing Filters (Recommended once a month or as required).
1.
Turn OFF electrical supply to unit.
2.
Open both front service panels with the key provided. Keys may vary.
3.
Slide out dirty filters and replace with new ones (Fig. 2) or wash filters (if permanent) with water, flushing in opposite direction
of air flow, let dry and replace. (Fig. 1)
4.
Units that are equipped with DX Cooling only will have a washable filter that is located in front of the condenser coil. To gain
access to the filter the compressor door must be removed.
5.
Replace all access panels and close both front service panels and lock with key.
Never operate unit without
a filter in place. Doing
so may damage internal
components and/or cause a
loss of efficiency.
4.4 Figure 1 |
Washable Filters(s)
4.5 Figure 2 |
Disposable Filter(s)
Fig. 1
Washable Filter(s)
Fig. 2
Disposable Filter(s)
