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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.
S
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.
S
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)
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 defrost control will ignore the test pins.
When the jumper is placed across the TEST pins for two
seconds, the defrost 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.
Defrost Control Diagnostic LEDs
The defrost board uses two LEDs for diagnostics. The
LEDs flash a specific sequence according to the condition.
Table 6. Defrost Control (CMC1) Diagnostic LEDs
Mode
No power to con-
trol
Normal operation /
power to control
Anti-short cycle
lockout
High pressure
switch fault
High pressure
switch lockout
Page 29
Green LED (DS2)
Red LED (DS1)
OFF
OFF
Simultaneous Slow FLASH
Alternating Slow FLASH
Slow FLASH
OFF
ON
OFF
XP13 SERIES
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