3
10. Unscrew the bolts that attach the manifold adapter to
the tube sheet and remove the manifold adapter and
the inlet/outlet manifold as a unit.
11. Carefully disconnect all three metering tubes from the
Combustion Air Blower Assembly (1 to the Combination
Gas Control Valve, 2 to the Air Flow Switch).
12. Remove the bolt from the Gas Piping Clamp.
13. Unplug all wires to the Control Box. Unscrew three
nuts and remove the Control Box, the Heat Shield, and
the Membrane Pad and Cover as a unit (See Figure 2,
Key No. 4).
14. Unscrew the four nuts holding the Blower Adapter
Plate to the top of the Combustion Chamber and
remove the Combustion Air Blower, the Igniter, the
Combination Gas Valve and associated piping and the
Blower Adapter Plate as a unit (See Figure 2, Key No.
5). Remove the Flameholder and Flameholder Cone (if
used).
NOTICE:
BE CAREFUL not to break or crack the igniter
– it is fragile!
15. Unscrew the nuts holding the Combustion Chamber
top to the Combustion Chamber body.
16. Unscrew 4 hold-down nuts from the hangers support-
ing the Combustion Chamber.
17. Wrap a shop rag around each hanger, one at a time (be
careful; it’s sharp) and hammer down on the Lower
Enclosure while lifting the hanger by the shop rag. This
will lift the hanger up off of the hold-down bolt.
18. Lift the Combustion Chamber out of the Lower
Enclosure.
Heavy parts; can cause personal injury.
When lifting, use all proper precautions for the weights
involved.
19. Cut the RTV all the way around the top of the
Combustion Chamber with a screwdriver.
20. With a mallet and screwdriver, go around the
Combustion Chamber cover tapping
up
until the RTV
separates and releases the Combustion Chamber cover.
Be careful not to damage the Combustion Chamber.
21. Remove the Combustion Chamber cover.
California’s Proposition 65 lists
Refractory Ceramic Fibers heated to 1800° F or higher
as a possible human carcinogen.
See the warning box
on Page 6 for further information. Call 1-800-752-0183
for a Material Data Safety Sheet (MSDS).
22. Remove the top insulation, the Heat Exchanger Coil,
the Condensate Evaporator, the Bottom Insulation, and
the metal spacer from the Combustion Chamber. Do
not remove the RTV that seals the manifold mounting
plate to the combustion chamber.
23. Clean up the Combustion Chamber, the Combustion
Chamber cover, and the Spacer. Be sure to completely
remove all RTV from the Combustion Chamber and
Combustion Chamber top.
24. Reinstall the clean spacer in the Combustion Chamber.
Install one 1/2” white Insulation Blanket on top of the
spacer and one piece of 1” “M” insulation on top of the
Blanket. Make sure that the insulation is centered in the
Combustion Chamber.
NOTICE:
Model SR/SRC200 heaters built before 1/1/98
require two 1/2” Insulation Blankets.
2
5
3
1
4
Figure 2: Removal of major sub-assemblies
1/2" Top
Blanket
1" Top
Insulation
1/2" Bottom
Blanket
1" Bottom
"M" Insulation
Flameholder
Insulation
Cap (Tape
to bottom of
Flameholder)
Spacer
Condensate
Evaporator
Flameholder
3122 1197
Figure 3: Correct order for installation of insulation.
