Gas-Fired Products PTU Series manual Lighting and Shutdown Instructions, Sequence of Operation

18.0) LIGHTING AND SHUTDOWN INSTRUCTIONS

Never operate the heater with the access panel open or removed.

The access panels must be closed tightly with all the necessary screws during operation.

Failure to do so may result in death, serious injury or property damage.

The access doors on either side of the burner must be securely fastened before operating the heater.

DANGER

FIRE HAZARD

Never operate the heater with the access panel open or removed. This access panel must be closed tightly with all the necessary screws during operation.

Failure to do so may result in death, serious injury or property damage

SIDE VIEW

1) Turn on the gas and electrical supply. Rotate the gas valve knob counter-clockwise to the “ON” position.

2)Set the thermostat to call for heat. The blower motor will energize.

3)Ignition should occur after the 15-second pre-purge.

4)If the burner fails to light, or flame is not detected during the first trial for ignition (a period of approximately 15 seconds) the gas valve is de-energized and the control goes through an inter-purge delay of approximately 60 seconds before another ignition attempt. The control will attempt two additional ignition trials before going into lockout, and the valve relay will be de-energized immediately. The blower will be turned off following a post-purge period of approximately 30 seconds.

5)If the heater does not light, manually reset the thermostat or shut off power completely for 5 minutes before attempting to relight.

6) To permanently shut down the heater, rotate the gas valve knob clockwise	to the “OFF” position and turn off
the gas and electrical supply.

NOTE: THE LIGHTING AND SHUTDOWN INSTRUCTIONS ARE ALSO SHOWN ON THE PERMANENT NAMEPLATE LABEL ATTACHED TO THE HEATER.

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 C).

Thermostat	T0	T1	T2	T3	T4	T5	T6
Blower
Air switch
Red power light
Ignition
Gas valve
Flame sensing
Amber valve light
Call for heat, Thermostat on
15 secs pre-purge
15 secs trial for ignition
Normal operation flame sensing
Thermostat (turn off)
30 secs post-purge1
Heater OFF		Function ON			Function OFF
				–40–

T7

Form #43343330 May 08