York B3CH 048 and 060 User Manual
3. Using an inclined manometer, determine the pressure drop
across a dry indoor coil. Since the moisture on an indoor
coil may vary greatly, measuring the pressure drop across a
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.
coil may vary greatly, measuring the pressure drop across a
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
through the unit can be determined from the curve in Figure 11.
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. 8mm (
the drilled holes in the side panels. 8mm (
5
16
in.) dot plugs (P/N
029-13880) are available through normal parts ordering
procedures.
procedures.
NOTE: DE-ENERGIZE THE COMPRESSORS BEFORE
TAKING ANY TEST MEASUREMENTS TO ENSURE
A DRY INDOOR COIL.
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.
sonal injury.
FILTERS - Inspect once a month. Replace disposable or clean
permanent type as necessary. DO NOT replace permanent
type with disposable.
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.
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.
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.
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.
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.