Raypak 407A, 406A, 206A, 337A, 336A, 207A, 267A, 266A Pilot Removal, Combustion Blower Removal

LOW NOx HEATERS (CONTINUED)

BAFFLE	COMBUSTION
	AIR BLOWER
MOUNTED INLET SIDE

MAIN BURNER AND ORIFICE REMOVAL

1.	Remove burner tray, following above procedure.
2.	Remove pilot. See pilot removal procedure.
3.	Remove (8) total screws from the burner hold-
	down brackets, front and rear of tray.

PILOT

LOW NOx

BURNER

BURNER

HOLD-DOWN

BRACKET

GAS ORIFICE

GAS VALVE

4.	Remove (8) total screws from the left and right
	sides of the manifold assembly. Detach the air/gas
	manifold assembly from the burner tray assembly.
5.	Remove burners by raising them straight up off the
	rear end slots.
6.	Use a long 9/16” socket wrench to remove orifice
	from the gas manifold.
7.	Reverse above procedure to reinstall.

Low NOx Burner Tray

BURNER TRAY REMOVAL

1.Shut off main electrical power switch to heater.

2.Shut off gas upstream of heater.

3.Remove front door.

4.Disconnect gas line from gas valve.

5.Remove (2) screws that mount burner tray to the base of the unit, and (2) screws that mount the blower box to the burner tray, and (1) screw that secures the anti-rotation bracket to the heater.

6.Disconnect wires that terminate at gas valve.

7.Unscrew (4) screws that secure the control box.

8.Disconnect pilot wire from the pilot assembly.

9.Disconnect wire connector from the combustion blower.

10.Carefully slide out the burner tray assembly.

11.Reverse above procedure to reinstall.

GAS VALVE REMOVAL

1.Remove burner tray, following above procedure.

2.Disconnect, pilot tubing from gas valve.

3.Remove (2) screws that mount anti-rotation bracket to the burner tray.

4.Turn vertical gas pipe from manifold slightly and unscrew gas valve.

5.Reverse above procedure to reinstall.

Low NOx Horizontal Pilot

PILOT REMOVAL

1.Disconnect pilot tubing from gas valve.

2.Remove the pilot wire from the pilot assembly.

3.Remove (2) screws that mount the pilot assembly to the burner tray.

4.Pull the pilot assembly downwards and outwards.

5.Reverse above procedure to reinstall.

COMBUSTION BLOWER REMOVAL

1.Remove the (2) screws that secure the blower box to the burner tray.

2.Remove (2) screws that mount the blower box to the base of the heater.

3.Disconnect wire connector from the combustion blower.

4.Carefully remove blower box with combustion blower.

5.Remove (2) screws that secure combustion blow- er to blower box.

6.Reverse above procedure to reinstall.

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