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462 06 1211 00
3/17/06
Disassembly
Refer to Figure 1 and the following steps.
Disassembly
Figure 1
1. After shutting off gas supply and electric power to the unit
remove the access door, exposing gas valve and burner
compartment.
2. Disconnect gas line from gas valve so manifold assembly
can be removed.
3. Disconnect wiring at gas valve. Be sure to note the proper
location of any and all electrical wiring disconnected.
4. If converting from Propane Gas to Natural Gas, remove the
pilot supply line from the gas valve.
5. Remove the four (4) screws holding the manifold and gas
valve to the manifold supports. Do Not discard any screws.
6. Carefully remove the manifold assembly.
7. If converting fromPropane Gas to Natural Gas in the stateof
California, NOx baffles must be installed to comply with
California law. NOx baffles can be ordered from Fast Parts.
Remove the two (2) screws holding the burner assembly in
place. Install the correct NOx baffle for the unit, if required,
and replace the Burner Assembly using the original two
screws, Figure 2.
Installing NOx Baffles
Figure 2
or
Changing Main Burner Orifices
1. Remove the gas burner orifices from the manifold assembly
using a box end wrench or socket wrench, figure 3, and re-
place them with the proper orifice size for the specific fur-
nace model, input size, and altutude from table 1.
Changing Orifices
Figure 3
2. Tighten the orifices so they are 1
3
/
16
″ from the face of the
orifice to the backside of the manifold (See Figure 4).Make
sure orifice is installed straight so that it forms a right angle
(90°) to the manifold.