system error. The LED will blink "ON" for 1 second and "OFF"
for 1 second during the opening of either high or low pressure
switches. If four trips occur within 30 minutes, the control board
logic will lock out the outdoor unit, preventing operation. The
unit can be operated again by resetting the indoor two stage
cooling thermostat once the lockout condition is resolved.
Crankcase Heater Operation
The control board will energize the crankcase heater during the
condensing unit "OFF" cycle.
Condensing Unit Fan Operation
The control board will energize the condensing unit fan anytime
the compressor is operating. The outdoor fan will remain ener-
gized during the "One Minute Inter-Stage Time Delay". How-
ever, the fan will not remain energized, if either, the High or Low
pressure switches trip.
INSTRUCTING THE OWNER
Assist owner with processing warranty cards. Review Owners
Guide and provide a copy for the owner 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 periods of shut down, do not
attempt to start the unit 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 opera-
tion and maintenance of all other system components.
INDICATIONS OF PROPER OPERATION
Cooling operation is the same as any conventional air condi-
tioning unit.
The following checks may be made to determine if the system
is operating properly:
1. The outdoor fan should be running, with warm air being
discharged from the top of the unit.
2. The indoor blower (furnace or air handler) will be operating,
discharging cool air from the ducts.
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.
If unit is not operating properly, check the following items before
calling a serviceman:
1. Indoor section for dirty filter.
2. Outdoor section for leaf or debris blockage.
Eliminate problem, turn off the thermostat for 10 seconds and
attempt start. Wait 5 minutes. If system does not start, call
service technician.
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 CalClean (mix one part CalClean 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 evaporator coil drain pan should be inspected and
cleaned regularly to prevent odors and assure proper drain-
age.
WHEN THE SYSTEM IS FUNCTIONING PROPERLY AND
THE OWNER HAS BEEN FULLY INSTRUCTED, SECURE
THE OWNER’S APPROVAL.
P.O. Box 1592, York, Pennsylvania USA 17405-1592
Subject to change without notice. Printed in U.S.A
Copyright
by York International Corporation 1994. All Rights Reserved.
550.37-N1Y
LED DISPLAY
DEFINITION
LED LIGHT "ON" (No Flashing)
Normal Operation
FLASH (1 Second) PAUSE (4 Seconds)
Control Board Warm-up Operation
FLASH (1 Second) PAUSE (1 Second)
High or Low Pressure Switch Trip
RAPID FLASHES
High or Low Pressure Switch Lockout
LED LIGHT "OFF"
No Power Supply or Board Failure
TABLE 7 - LED FUNCTIONS
