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Compressor Delay (P5)
The defrost control has a field-selectable function to reduce
occasional sounds that may occur while the unit is cycling in
and out of the defrost mode.
Units with defrost control 100269-02: The compressor
will be cycled off for 30 seconds going in and out of the
defrost mode when the compressor delay jumper is
removed.
Units with defrost control 100269-04: The compressor
will be cycled off for 30 seconds going in and out of the
defrost mode when the compressor delay jumper is
installed.
NOTE — The 30‐second compressor feature is ignored
when jumpering the TEST pins.
Time Delay
The timed‐off delay is five minutes long. The delay helps to
protect the compressor from short‐cycling in case the power
to the unit is interrupted or a pressure switch opens. The
delay is bypassed by placing the timer select jumper across
the TEST pins for 0.5 seconds.
Test Mode (P1-TEST)
A TEST option is provided for troubleshooting. The TEST
mode may be started any time the unit is in the heating mode
and the defrost thermostat is closed or jumpered. If the
jumper is in the TEST position at power-up, the control will
ignore the test pins. When the jumper is placed across the
TEST pins for two seconds, the control will enter the defrost
mode. If the jumper is removed before an additional
5-second period has elapsed (7 seconds total), the unit will
remain in defrost mode until the defrost thermostat opens or
14 minutes have passed. If the jumper is not removed until
after the additional 5-second period has elapsed, the defrost
will terminate and the test option will not function again until
the jumper is removed and re-applied.
Diagnostic LEDs (DS1 and DS2)
The defrost control uses two LEDs for diagnostics. The
LEDs flash a specific sequence according to the diagnosis.
See table 7.
Table 7. Defrost Control Diagnostic LEDs
DS2 Green DS1 Red Condition
OFF OFF Power problem
Simultaneous Slow Flash Normal operation
Alternating Slow Flash 5-minute anti-short cycle delay
Fault and Lockout Codes
OFF Slow Flash Low Pressure Fault
OFF ON Low Pressure Lockout
Slow Flash OFF High Pressure Fault
ON OFF High Pressure Lockout
Shaded entries apply to demand defrost controls only.
Time Delay
The timed-off delay is five minutes long. The delay helps
protect the compressor from short-cycling in case the power
to the unit is interrupted or a pressure switch opens. The
delay is bypassed by placing the timer select jumper across
the TEST pins for 0.5 seconds.
NOTE — The defrost control must have a thermostat
demand for the bypass function.
During a single thermostat cycle, the defrost control will lock
out the unit after the fifth time that the circuit is interrupted by
any pressure switch that is wired to the defrost control. In
addition, the diagnostic LEDs will indicate a pressure switch
lockout after the fifth occurrence of an open pressure switch
(see table 7). The unit will remain locked out until power is
broken then remade to the control or until the jumper is
applied to the TEST pins for 0.5 seconds.
NOTE — The defrost control ignores input from the low
pressure switch terminals during the TEST mode, during
the defrost cycle, during the 90-second start-up period, and
for the first 90 seconds each time the reversing valve
switches heat/cool modes. If the TEST pins are jumpered
and the 5-minute delay is being bypassed, the LO PS
terminal signal is not ignored during the 90-second
start-up period.
Service Light Connection
The defrost control includes terminal connections for a
service light which provides a signal that activates the room
thermostat service light during periods of inefficient
operation.
IMPORTANT
After testing has been completed, properly reposition test
jumper across desired timing pins.
Maintenance
DEALER
WARNING
Electric shock hazard. Can cause injury or
death. Before attempting to perform any
service or maintenance, turn the electrical
power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each cooling
season, the system should be checked as follows:
Outdoor Unit
1. Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
2. Outdoor unit fan motor is pre-lubricated and sealed. No
further lubrication is needed.
3. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
4. Check all wiring for loose connections.
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