Subject to change without notice. Printed in U.S.A. 035-19946-001 Rev. B (0804)
Copyright © by York International Corp. 2004. All rights reserved. Supersedes: 035-19946-001 Rev. A (0404)
Unitary 5005 Norman
Product York OK
Group Drive 73069
SECTION VIII: SYSTEM START-UP
ENERGIZE CRANKCASE HEATER
If this unit is equipped with a crankcase heater for the compressor, a
warning label with an adhesive back is supplied in the unit installation
instruction packet. This label should be attached to the field supplied
disconnect switch where it will be easily seen.
In order to energize the crankcase heater, set the indoor cooling ther-
mostat to the "OFF" position. Close the line power disconnect to the
unit.
IMPORTANT: An attempt to start the compressor without at least 8
hours of crankcase heat will damage the compressor.
WITH POWER TO UNIT AND THERMOSTAT IN COOLING
POSITION.
1. In the cooling cycle, discharge gas is pumped to the outdoor coil
which is the condenser. The indoor coil is the evaporator.
2. If fan switch is in "ON" position, a circuit is made through blower
relay to provide continuous blower operation.
3. With fan switch in "AUTO" position, a circuit is made from thermo-
stat cooling contact through blower relay to provide blower opera-
tion.
4. System will cycle with thermostat demand to provide cooling as
needed.
INDICATIONS OF PROPER OPERATION
Cooling
1. The outdoor fan should be running, with warm air being dis-
charged from the top of the unit.
2. The indoor blower (furnace or air handler) will be operating, dis-
charging cool air from the ducts. Coils or other parts in the air cir-
cuit should be cleaned as often as necessary to keep the unit
clean. Use a brush, vacuum cleaner attachment, or other suitable
means.
3. The vapor line at the outdoor unit will feel cool to the touch.
4. The liquid line at the outdoor unit will feel warm to the touch.
Instructing the Owner
Assist owner with processing warranty cards. Review Owners Guide
and provide a copy to the owner and guidance on proper operation and
maintenance. Instruct the owner or the operator how to start, stop and
adjust temperature setting.
When applicable, instruct the owner that the compressor is equipped
with a crankcase heater to prevent the migration of refrigerant to the
compressor during the “OFF” cycle. The heater is energized only when
the unit is not running. If the main switch is disconnected for long peri-
ods, do not attempt to start the unit until 8 hours after the switch has
been connected. This will allow sufficient time for all liquid refrigerant to
be driven out of the compressor.
The installer should also instruct the owner on proper operation and
maintenance of all other system components.
Maintenance
1. Dirt should not be allowed to accumulate on the outdoor coils or
other parts in the air circuit. Clean as often as necessary to keep
the unit clean. Use a brush, vacuum cleaner attachment, or other
suitable means.
2. The outdoor fan motor is permanently lubricated and does not
require periodic oiling.
3. If the coil needs to be cleaned, it should be washed with Calgon
Coilclean (mix one part Coilclean to seven parts water). Allow
solution to remain on coil for 30 minutes before rinsing with clean
water. Solution should not be permitted to come in contact with
painted surfaces.
4. Refer to the furnace or air handler instructions for filter and blower
motor maintenance.
5. The indoor coil drain pan should be inspected and cleaned regu-
larly to prevent odors and assure proper drainage.
TABLE 2:
R-22 Temperature and Pressure
SUCTION
PRESSURE
PSIG
(Service Port)
SUCTION SERVICE VALVE TEMPERATURE
0
1
246810121416182022242628303234
61.5 353739414345474951535557596163656769
64.2 373941434547495153555759616365676971
67.1 394143454749515355575961636567697173
70.0 414345474951535557596163656769717375
73.0 434547495153555759616363676971737577
76.0 454749515355575961636567697173757779
79.2 474951535557596163656769717375777981
82.4 495153555759616365676971737577798183
1. Superheat Temperature
IT IS UNLAWFUL TO KNOWINGLY VENT, RELEASE OR DIS-
CHARGE REFRIGERANT INTO THE OPEN AIR DURING
REPAIR, SERVICE, MAINTENANCE OR THE FINAL DIS-
POSAL OF THIS UNIT.
WHEN THE SYSTEM IS FUNCTIONING PROPERLY AND
THE OWNER HAS BEEN FULLY INSTRUCTED, SECURE
THE OWNER’S APPROVAL.
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