Specifications

12
1. Combustion fan purges heat chamber, PCB
verifies fan rotation
2. Ignition spark begins
3. When sensing electrode detects spark, gas
valve assembly opens
4. Ignition occurs and heat exchanger warms
5. Spark stops as flame rod & PCB verify flame
6. When heat exchanger is warm enough,
convection room blower circulates warm air
into the structure.
7. When filled, the humidifier tray ensures the
air is not too dry (if needed)
8. Thermistor & PCB determine gas and fan
settings
9. When temperature set point is
reached, if needed, gas valves close &
combustion fan stops. Convection fan
continues to run to cool down unit.
10.When temperature drops, process starts over
ENERGYSAVER® Direct Vent Furnaces
Operation Sequence
Spark and sensing
electrodes
PCB
Humidifier Tray
Heat Exchanger
Combustion
Fan
Thermistor
POV SV1 & 2
Convection Fan
Flame Rod
Concentric Termination