Advanced Distributor Products Unit Heater SEP−100-S

Turn off both electrical and gas supply to unit

Disconnect combustion air inducer wiring

Remove screws securing flue box to unit

Was it necessary to remove blower assembly from flue box?

Enter the gas line pressure with unit firing at maximum rate

Is the gas line pressure at least 5'' (127mm) w.c for natural gas or 11'' (279mm) w.c for LP/propane gas?

Enter the current regulator pressure

Adjust manifold pressure to the value specified on the unit rating plate

Refer to figures 8, 9, and 10 for gas pressure adjustment screw location

Verify that the combustion air inducer starts immediately when the thermostat calls for heat.

Ensure the combustion air pressure switch proves inducer operation before allowing power to the ignition controller.

Confirm that after a prepurge of approximately 30 seconds, the spark ignition is energized and the solenoid valves open in the gas valve.

Verify step opening valve operation for models SEP 230, 250, 300, 345, and 400

Ensure the spark ignites the gas and the ignition sensor proves the flame.

Is the combustion process continuing without interruption?

Examine burner flames for proper appearance during the heating season

Examine burners for any deposits or blockage

Turn off both electrical and gas supplies to unit

Disconnect gas supply piping, high tension and sensor leads

Set the thermostat to call for heat

Did the system begin normal sequence of operation?

Time taken for LED to fast flash (seconds)

Did the gas valve close after 10 seconds?

Number of times steps 4 and 5 repeated before lockout

Was the gas valve lockout indicated by two flashes on the LED?