Raypak P-R185A to P-R405A, C-R185A to P-R405A, P-R185AL to P-R405AL, C-R185AL to C-R405AL, RP2100 Installation And Operating Instructions Manual page 31

ADDENDA: LOW NOX HEATERS
LOW NOx BURNER TRAY ASSEMBLY
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
procedure.
2. Disconnect, pilot tubing from gas valve.
3. Turn vertical gas pipe from manifold slightly and
unscrew gas valve.
4. Reverse above procedure to re-install.
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.
(CONTINUED)
6. Use a long 9/16" socket wrench to remove orifices
from the gas manifold.
7. Reverse above procedure to re-install.
Fig # 9362
PILOT REMOVAL
1. Disconnect pilot tubing from gas valve.
2. Remove (4) screws from control box. Open the
control 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 re-install. Make sure
the pilot bracket is all the way up on the pilot side,
see drawing below.
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 re-install.
31
Fig # 9363
IID PILOT
Fig# 9368