![Compressor Delay](/images/new-backgrounds/33634/3363415x1.webp)
jumper is not in place, the control defaults to a
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 2 seconds, the control will enter the defrost mode. If the jumper is removed before an additional
Compressor Delay
The defrost board has a
NOTE: The
Time Delay
The
Pressure Switch Circuit
The defrost control includes
During a single demand cycle, the defrost control will lock out the unit after the fifth time that the circuit is interrupted by any pressure switch wired to the control board. In addition, the diagnostic LEDs will indicate a
NOTE: The defrost control board ignores input from the low pressure switch terminals as follows:
•During the TEST mode
•During the defrost cycle
•During the
•For the first 90 seconds each time the reversing valve switches heat/cool modes
If the TEST pins are jumpered and the
Diagnostic LEDs
The defrost board uses two LEDs for diagnostics. The LEDs flash a specific sequence according to the condition as shown in Table 3.
Defrost Control Board
Diagnostic LEDs
Mode | Green LED | Red LED | |
(DS2) | (DS1) | ||
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No Power | Off | Off | |
to Board | |||
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| |
Normal Operation/ | Simultaneous Slow Flash | ||
Power to Board | |||
|
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Alternating Slow Flash | |||
Lockout | |||
|
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Low Pressure | Off | Slow Flash | |
Switch Fault | |||
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Low Pressure | Off | On | |
Switch Lockout | |||
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High Pressure | Slow Flash | Off | |
Switch Fault | |||
|
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High Pressure | On | Off | |
Switch Lockout | |||
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Table 3
Circulating Air Blower
Depending on the package unit model, the blower motor will be either a
PSC Motor
The circulating air blower is controlled by a timing circuit in the blower control. Timings are not adjustable.
Page 8 of 14 | Issue 0902 |