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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.
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.
PILOT
BURNER
BURNER
HOLD-DOWN
BRACKET
GAS
ORIFICE
GAS VALVE
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.
HONEYWELL MILLIVOLT
PILOT
ROBERTSHAW MILLIVOLT
PILOT