WARNING:Failure to properly adjust the total system air quan-
tity can result in poor system performance.
After readings have been obtained, remove the tubes and seal
the drilled holes in the side panels. 5/16" dot plugs (P/N
029-13880) are available through normal parts ordering
procedures.
NOTE: DE-ENERGIZE THE COMPRESSORS BEFORE
TAKING ANY TEST MEASUREMENTS TO ENSURE
A DRY INDOOR COIL.
NORMAL MAINTENANCE
CAUTION: Prior to any of the following maintenance proce-
dures, shut off all power to the unit to prevent
personal injury.
FILTERS - Inspect once a month. Replace disposable or clean
permanent type as necessary. DO NOT replace permanent
type with disposable.
MOTORS - Indoor fan and outdoor fan motors are permanently
lubricated and require no maintenance.
OUTDOOR COIL - Dirt should not be allowed to accumulate
on the outdoor coil surface or other parts in the air circuit.
Cleaning should be as often as necessary to keep coil clean.
Use a brush, vacuum cleaner attachment, or other suitable
means. If water is used to clean coil, be sure power to the unit
is shut off prior to cleaning.
NOTE: Exercise care when cleaning the coil so that the coil
fins are not damaged.
Do not permit the outdoor air discharge to be ob-
structed by overhanging structures of shrubs.
MAINTENANCE
SECURE OWNER’S APPROVAL: When the system is functioning properly, secure the owner’s approval. Show him the location
of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust temperature settings
within the limitations of the system.
FIG. 10
- PRESSURE DROP ACROSS A DRY INDOOR
COIL VS. SUPPLY AIR CFM
0
0.1
0.2
0.3
0.4
0.5
1000 1500 2000 2500 3000
036
048
060
NOMINAL CFM
PRESSURE DROP (IWG)
511.06-N5Y
14 Unitary Products Group
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