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3. Using an inclined manometer,determine the pressure drop
across a dry indoor coil. Since the moisture on an indoor
coilmayvarygreatly,measuringthepressure dropacrossa
wet coil under field conditions would be inaccurate. To
ensure a dry coil, the compressors should be de-energized
while the test is being run.
4. Knowing the pressure drop across a dry coil, the actual airflow
throughtheunitcan bedeterminedfromthe curveinFigure11.
WARNING:Failure to properly adjustthe 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. 8mm (
in.) 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 per-
sonal injury.
FILTERS - Inspect once a month. Replace disposable or clean
permanent type as necessary. DO NOT replace permanent
type with disposable.
MOTORS- Indoorfan and outdoorfan motors arepermanently
lubricated and require no maintenance.
OUTDOORCOIL-Dirt shouldnotbe allowedto accumulateon
theoutdoorcoil surfaceor otherpartsinthe aircircuit.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.
035-12984-001-A-0204
14 Unitary Products Group
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.