19.0)
SEQUENCE OF OPERATION
The chart below shows the sequence of operation for the normal operating cycle of the PTS/PTU when connected
to a permanent 120V power supply and the heater is turned on and off by a remote 24V thermostat. (Electrical
connection diagram B).
If the flame is not sensed during sequence T3 then the burner will automatically begin re-ignition sequence T2. The
ignition sequence will be repeated three times with a 60 second inter-purge. If the flame is not re-established the
heater will go to lockout.
Form #43343530
–40–
JJuly 08