Burner Tray Removal; Gas Valve Removal; Main Burner And Orifice Removal; Pilot Removal And Cleaning - Raytherm WH-0133 Installation & Operating Instructions Manual

Burner Tray Removal

1. Shut-off power and gas supply to the heater.
Disconnect union(s) and pilot tubing, then loosen
and remove burner hold-down screws.
2. Disconnect wires at gas valve and slide burner
drawer out.

Gas Valve Removal

1. Shut-off gas supply to the heater. Remove gas pip-
ing to gas valve inlet.
2. Disconnect wires, pilot tubing and bleed line, if
required.
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 screws and burner hold-down bracket.
NOTE: If the heat exchanger is sooted badly, the
burner hold-down bracket and spacer can become
distorted from direct flame impingement and this
usually necessitates replacement of these parts.
2. Lift burners from slotted spacer and slide from ori-
fices. Clean with a wire brush.
3. Orifices usually do not need to be replaced. To
clean, run either copper wire or wood through ori-
fice. Do not enlarge hole. To remove orifice, use a
socket wrench and remove the manifold. DO NOT
overtighten when reinstalling.
COMBINATION FLAME SENSOR/
IGNITER AND PILOT BURNER
Fig. 38: Typical Burner Tray Illustrated

Pilot Removal and Cleaning

1. Disconnect pilot tubing at pilot and sensor/igniter
2. Remove pilot and bracket, clean pilot of debris,
3. Replace pilot, pilot tubing, sensor ignition wires
High Limit or Tankstat
Removal
1. Turn off electrical power.
2. Remove front inspection panel.
3. Remove wires to high limit and loosen screws
4. Remove wedge clip holding sensing bulb in con-
5. Remove high limit and install a new one.
6. Check control operation before leaving job.

Heat Exchanger Removal

1. Shut water, gas and electricity off, close valves
2. Remove side inspection panels.
3. Remove top holding screws.
4. Remove draft diverter, lift and remove top and flue
5. Loosen bolts and disconnect flange nuts on in/out
45
wire. Remove screws holding pilot bracket to burn-
er tray.
small bugs, etc., with wire or small brush.
and check for leaks.
holding high limit to cabinet.
trol well.
and relieve pressure, remove relief valve.
collector on stack type models. Remove inspec-
tion panels.
header, loosen union(s) at gas pipe, and slide