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All installations and services must be performed by qualified service personnel.
DIP SWITCH 2 SECTION STATE
FACTORY
SETTING
FACTORY
SETTING
Blower On and Off Delays
Four Heat blower on and four blower off delays are selected by two dip switches for each function. Refer
to Table 11 for specific delay values.
PSC TROUBLE SHOOTING
DIAGNOSTIC FEATURES
The control board is equipped with 4 green Input Status LEDs and 1 red Board Status LED. These are
intended to provide a quick view into furnace performance without requiring a voltmeter.
The green Input Status LEDs are driven by the "Y", "W", "G", and "DEHUM" inputs and are located
directly below those inputs. They will light to indicate the presence of these signals.
The red Board Status LED has two functions:
It will light when the board recognizes a valid input signal and will stay lit until all valid signals are
removed. This is intended to show that the board is functioning and able to respond to input signals.
It will flash rapidly while 120VAC is missing from the LIMIT switch. This is intended to give a quick
visual indication of the High Limit switch.
1
2
3
OFF
OFF
ON
OFF
OFF
ON
ON
ON
OFF
OFF
ON
OFF
OFF
ON
Table 11: ON and OFF Blower Delay Time Switch Settings
BLOWER DELAY TIMES
4
ON - SEC
ON
ON
27
OFF - MIN
30
60
120
240
2
4
6
8
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