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expire in ten minutes if not manually
cancelled by resetting ‘ManSTG’ back
to zero.
LED Flash Alarm Codes
The flashing red LED will be to the right of
the screen. The number of blinks is
described below. The LCD screen will also
display the screens.
1 = LATA probe open/short
2 = LATB probe open/short
3 = OAT sensor open/short
4 = Leaving air temp over limit
5 = Cooling down after hi limit’ event
6 = LAT below low limit
7 = Stage 1 only recovery after
mechanical limit
8 = Shutdown after too many hi limit
events
9 = Short or overload on the 0-10VDC
analog signal output
Operation
Controller receives 24VAC preheat enable
Controller evaluates if outside air
temperature “OAT” is below setpoint
‘OATset’
If OAT < ‘OATset’, controller will delay
heating startup by time setpoint
‘STARTDLY’, then stage up preheat to
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