Raypak 405B Operations Instructions download pdf (Page 38)

BURNER DRAWER 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 secure gas

valve to jacket.

6. Disconnect wires that terminate at gas valve.

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

8. Disconnect pilot wire from the ignition module.

9. Disconnect wire harness from the combustion blower.

10. Carefully slide out the burner tray assembly.

11. Reverse above procedure to reinstall.

GAS VALVE REMOVAL

1. Remove burner drawer. See burner removal proce-

dure.

2. Disconnect, pilot tubing from gas valve.

3. Turn vertical gas pipe from manifold slightly and un-

screw gas valve.

4. Reverse above procedure to reinstall.

MAIN BURNER AND ORIFICE REMOVAL

1. Remove burner drawer. See burner drawer removal

procedure.

2. Remove pilot. See pilot removal procedure.

3. Remove (8) total screws from the hold down brack-

ets, front and rear of tray.

4. Remove (8) total screws from the left and right sides

of the Manifold assembly. Detach the manifold as-

sembly from the burner tray assembly.

5. Remove burners by raising the bracket on the back

end of the burners up and out of their slots.

LOW NOX HEATERS (CONTINUED)

Fig # 9362

PILOT REMOVAL

1. Disconnect pilot tubing from gas valve.

2. Remove (4) screws from control box. Open the con-

trol box.

3. Remove the pilot wire from the ignition wire.

4. Remove (2) screws that mount the pilot bracket to

the air manifold assembly.

5. Pull the pilot bracket slightly, then drop and pull

downwards and outwards.

6. Reverse above procedure to reinstall. Make sure

the pilot bracket is all the way up on the pilot side,

see drawing below.

Fig # 9477

IID PILOT

LOW NOx BURNER TRAY ASSEMBLY

COMBUSTION FAN REMOVAL

1. Remove burner drawer. See burner drawer

removal procedure.

2. Remove (4) screws the mount the combustion

blower to the manifold assembly.

3. Reverse above procedure to reinstall.

6. Use a long 9/16” socket wrench to remove orifices

from the gas manifold.

7. Reverse above procedure to reinstall.

Fig# 9368

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Raypak 405B Operations Instructions Page 38

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