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SEQUENCE OF OPERATION
STEP #
1) Thermostat calls for heat.
2) Inducer turns on.
3) Pressure switch closes.
4) Power to ignitor.
5) Gas flow to burner.
6) Burner ignition proven.
NOTE: If there is a malfunction in any of the above steps, the sequence will stop at that point
and return to Step 2. If after 3 attempts malfunction still occurs, control will go into lockout
mode for one hour. This one hour lockout can be bypassed by resetting the thermostat, or
interrupting power.
7) Thermostat satisfied.
8) Gas valve closes.
9) Inducer turns off.
HEATER IS NOW IN STANDBY MODE.
Page 15
Thermostat
calls for heat
Power to Draft
Inducer
(Ventor Motor)
Pressure
Switch Closes
(Fan Proved)
Spark Ignition
Energized
Gas control
valve opens gas
flow to burner
Ignition
Proved
Heating
Cycle
Thermostat
satisfied
Gas control
valve closes
Draft
inducer off
Stand-by
mode
â
â
ââ
ââââ
â
â
â
â
Lockout
after 3
attempts
NO
NO
20 Sec.
Post Purge
15 Sec.