Raypak 266A, 406A, 206A Burner Tray Removal, GAS Valve Removal, Main Burner and Orifice Removal

BURNER TRAY REMOVAL -

ATMOSPHERIC MODELS

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 unit, and (2) screws that secure gas valve to jacket.

6.Disconnect wires that terminate at gas valve.

7.Disconnect hi-tension wire from PC board.

8.Slide out burner tray.

9.Reverse above procedure to reinstall.

GAS VALVE REMOVAL -

ATMOSPHERIC MODELS

1.Shut off gas supply to the heater. Remove gas piping to gas valve inlet.

2.Disconnect wires, pilot tubing and bleed line, if required.

3.Remove burner tray from heater.

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

5.Reverse above procedure to reinstall.

MAIN BURNER AND ORIFICE REMOVAL -

ATMOSPHERIC MODELS

1.Remove burner tray.

2.Remove screws and burner hold-down bracket.

NOTE: If the heat exchanger is sooted badly, the burner hold-down bracket and spacer can become dis- torted from direct-flame impingement and this usually necessitates replacement of these parts.

3.Lift burners from slotted spacers and slide from ori- fices. Clean with a wire brush.

4.Orifices usually do not need to be replaced. To clean, run either copper wire or wood toothpick through orifice. Do not enlarge hole. To remove orifice, use a socket wrench and remove from manifold. DO NOT overtighten when reinstalling.

	GAS VALVE
	PILOT
BURNER	GAS
	ORIFICE

BURNER

HOLD-DOWN

BRACKET

PILOT REMOVAL AND CLEANING

1.Disconnect pilot tubing and wires from gas valve.

2.Remove pilot assembly from burner tray.

3.Remove pilot from bracket.

4.Remove pilot orifice and air opening (Honeywell MV unit only), and clean with wire or small brush.

CAUTION! Do not enlarge hole in pilot orifice.

5. Reverse above procedure to reinstall.

HONEYWELL MILLIVOLT	ROBERTSHAW MILLIVOLT
PILOT	PILOT
Pilot	Pilot

Air

Opening

Orifice

Orifice

Fig. # 8045.1 Fig. # 8102.0

HEAT EXCHANGER REMOVAL

1.Shut water, gas and electricity off, close valves and relieve pressure, then remove relief valve. Remove side inspection panels.

2.Remove top jacket holding screws.

3.Remove rear top panel.

4.Remove screws mounting the rain shield to the rear panel. Also remove the screws that mount the rain shield to the sway brace. Remove rain shield.

5.Remove the four (4) screws holding down the flue collector. Remove the flue collector.

6.Disconnect flange nuts on Inlet/Outlet header, loosen union(s) at gas pipe and slide heater away from piping.

7.Lift heat exchanger straight up using caution not to damage refractory.

8.Reverse above procedure to reinstall. Make sure the insulation strips are properly replaced on top of the refractory retainer.

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