Hydro Flame 8500 series furnace
Hello all, I have a hydro flame 8500 series furnace, the thermostat has an on-off switch,and a 3 position fan switch, low,auto and high,the furnace will not light on the auto setting but if I switch ...
Forum Discussion
T-stat 'fan' setting should have NOTHING to do with furnace operation
Auto,low,high would be settings for A/C Unit fan
Furnace fan is controlled via furnace system
DC from a FUSED source goes to furnace...then backfeds to t-stat
When t-stat closes (temp setting lower then room temp) the DC then energizes a 'timed delay relay' OR a Blower Circuit on circuit board (depends on year model)
When energized FAN is powered by the DC from fused source.
Fan runs/triggers Sail Switch which then allows DC thru sail & limit switches to circuit board for gas valve & spark electtrode for ignition.
8500 series should have an LED light on circuit board which would indicate a Fault Code
Could be relay Or blower circuit, could be sail switch sticking, could be loose connections
This is wiring diagram using a 'relay'
This is a wiring diagram using blower circuit on circuit board
Got a voltmeter ----use it and trace the DC
Auto,low,high would be settings for A/C Unit fan
Furnace fan is controlled via furnace system
DC from a FUSED source goes to furnace...then backfeds to t-stat
When t-stat closes (temp setting lower then room temp) the DC then energizes a 'timed delay relay' OR a Blower Circuit on circuit board (depends on year model)
When energized FAN is powered by the DC from fused source.
Fan runs/triggers Sail Switch which then allows DC thru sail & limit switches to circuit board for gas valve & spark electtrode for ignition.
8500 series should have an LED light on circuit board which would indicate a Fault Code
Could be relay Or blower circuit, could be sail switch sticking, could be loose connections
This is wiring diagram using a 'relay'
This is a wiring diagram using blower circuit on circuit board
Got a voltmeter ----use it and trace the DC
