SystemAir changeair Sophomore 4000 Series - Filter Maintenance

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 lters will cause air ow 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 lters or a 1/4” washable lter, or a combination of washable and
disposable lters.
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 lters and replace with new ones (Fig. 2) or wash lters (if permanent) with water, ushing in opposite direction
of air ow, let dry and replace. (Fig. 1)
4. Units that are equipped with DX Cooling only will have a washable lter that is located in front of the condenser coil. To gain
access to the lter 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 lter in place. Doing
so may damage internal
components and/or cause a
loss of efciency.
4.4 Figure 1 | Washable Filters(s)
4.5 Figure 2 | Disposable Filter(s)
Fig. 1 Washable Filter(s)
Fig. 2 Disposable Filter(s)