Raypak RAYTHERM 133-4001 - Manual (Page 31)

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size, and connections which comply with all applicable
codes.
Flame Roll-Out Safety Switch
The boiler is equipped with a cut-off device to prevent
flame roll-out in the event the heat exchanger
becomes blocked. This is a "manual reset" type roll-
out switch, that must be reset by a service technician
after any over temperature conditions have been fixed.
Excessive restriction in the heat exchanger flue pas-
sage may cause the switch to disable the boiler.
Service
Burner Tray Removal
Fig. 45: Flame Roll-Out Safety Switch
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 re-install.
Gas Valve Removal
1. Remove burner tray. See Burner Tray 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 tray. See Burner Tray Removal
procedure.
2. Remove pilot. See Pilot Removal procedure.
3. Remove (8) total screws from the hold-down
brackets, front and rear of tray.
4. Remove (8) total screws from the left and right
sides of the manifold assembly. Detach the mani-
fold assembly 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.
BURNER
BURNER
HOLD-
DOWN
BRACKET
GAS
VALVE
COMBUSTION
AIR BLOWER
AIR SHUTTER
ADJUSTMENT
Fig. 46: Low NOx Burner Tray Assembly