5
29. Tighten the bolts to the torque spec as shown in Figure 7.
30. Turn on the water and check for leaks between the
Manifold Adapter and the Tube Sheet.
31. Install one piece of 1” top Insulation on top of the Heat
Exchanger and one 1/2” Insulation Blanket over the top
Insulation. Make sure that the insulation is centered on
the coil so that an equal number of heater coil fins
shows around the insulation.
32. Apply fresh High Temperature RTV (600°F Continuous,
700° F. Intermittent rating) all the way around the
inside top of the Combustion Chamber and the outside
of the Combustion Chamber cover (see Figure 8).
33. Reinstall the Combustion Chamber top and fasten with
nuts on studs from Combustion Chamber body.
34. Reinstall the Combustion Chamber in the Lower
Enclosure and fasten with hold-down nuts.
35. Reinstall the Flameholder and Flameholder Cone (if
used), and then the Combustion Air Blower, the Igniter,
the Combination Gas Valve and associated piping and
the Blower Adapter Plate as a unit; use new gaskets.
Be sure to reinstall the Insulation Cap on the bottom of
the Flameholder. Tighten Adapter Plate nuts to 70-80
in.-lbs. torque. See Figure 9.
1
2
3 6
7
10
5
4
9
8
75-115 in.-lbs./8.4-12.9 N-m
Torque Pattern - All Models
1. Make sure that all bolts are engaged and hand tight.
2. Torque the bolts in sequence as shown. Some noise
(popping, etc.) is normal as you tighten.
3. Go around the manifold and retighten the bolts as
needed to 75-115 in-lbs. (8.4-12.9 N-m) (you may
have to do this several times).
Figure 7: Torque Specs.
Apply RTV
here
and
here.
Apply RTV bead all the way around
both Combustion Chamber and Cover.
3140 0198
Figure 8: RTV Application For Reassembly
Reinstall Control Box
and Heat shield Assembly
Flameholder/Adapter
Plate Gasket
Flameholder/Combustion
Chamber Gasket
3123 1197
1
2
3
At reassembly, connect tubing
as shown:
1. From Air Inlet Port to
Combination Gas Valve;
2. From Air Inlet Port to
Air Flow Switch;
3. From bottom of Blower to
Air Flow Switch.
dapter
r/Combustion
asket
3123 1197
Figure 9: Make sure new gaskets are in place when
reassembling combustion chamber.
