Raypak 266 Installation And Operation Manual page 34

4. Turn vertical gas pipe from manifold slightly and
unscrew gas valve.
5. Reverse above procedure to reinstall.
Main Burner And Orifice Removal
1. Remove burner tray, following above procedure.
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 distorted
from direct-flame impingement
necessitates replacement of these parts.
3. Lift burners from slotted spacers and slide from
orifices. 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.
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, and clean with
wire or small brush.
CAUTION! Do not enlarge hole in pilot orifice.
A
5. Reverse above procedure to reinstall.
PILOT
AIR
OPENING
ORIFICE
Figure 61. Millivolt Pilot
Figure 62. Digital Pilot
34
Heat Exchanger Removal
1. Shut water, gas and electricity off, close valves and
2. Remove top jacket holding screws.
3. Remove rear top panel.
4. Remove screws mounting the rain shield to the rear
and this usually
5. Remove the four (4) screws holding down the flue
6. If ProTek Shield Assy is attached to the heater;
7. Lift heat exchanger straight up using caution not to
8. Reverse above procedure to reinstall. Make sure the
Tube Cleaning Procedure
Establish a regular inspection schedule, the frequency
depending on the local water conditions and the severity
of service. Do not let the tubes clog up solidly. Clean out
deposits over 1/16" (1.6 mm) in thickness.
The heater may be cleaned from the return header
side, without breaking pipe connections. It is preferable,
however, to remove both headers for better visibility
through the tubes and to be sure the ground-up lime dust
does not get into the system. Note that you do not remove
the top panel or the heater exchanger, generally.
After reaming, mount the wire brush in place of the auger
and clean out debris remaining in the tubes.
Another method is to remove the heat exchanger, ream
tubes and immerse heat exchanger in non-inhibited de-
scale solvent for severe scale build-up.
Figure 63. Tube Cleaning Kit
Desooting Procedure
Soot will clog areas between fins and cause eventual
tube failure. Any sign of soot at the base of the burners or
around the outer jacket indicates a need for cleaning.
relieve pressure, then remove relief valve. Remove
side access panels.
panel. Also remove the screws that mount the rain
shield to the sway brace. Remove rain shield.
collector. Remove the flue collector.
disconnect flange nuts on Inlet/Outlet header,
remove ProTek Shield Assy bonding wire from heat
exchanger stud, loosen union at gas pipe and slide
heater away from piping.
damage refractory.
insulation strips are properly replaced on top of the
refractory retainer.
Extension
Pieces (2)
A WARNING: Soot Is Combustible. Exercise Extreme
Care.
Auger Wire Brush
with Carbide Tip