Desa PCBM-325 Main Burner Orifice Conversion, Removing Front Refractory Access Panel

4.Remove logs. Carefully lift top logs straight up until pins are clear of lower logs

(see Figure 3). Continue removing logs one at a time. The rear log is very heavy and should be lifted with both hands. Place logs away from your work area. Be careful not to damage logs.

Figure 2 - Removing Front Refractory

Access Panel

Figure 3 - Removing Logs Set

Main Burner Orifice

Conversion

1.Using a #10 short Phillips screwdriver, remove top mounting screw holding pilot burner shield in place (see Figure 4).

2.With orifice mount exposed, use a 7/8" open-end back-up wrench on 3/8" flare adapter and remove 3/8" flare fitting at the end of 3/8" flare adapter. This will prevent spinning and damage to the flexible tube (see Figure 4).

3.Using the 7/8" wrench, remove the remain- ing orifice assembly from the burner tube.

4.Separate the 3/8" male flare adapter from the existing natural gas orifice fitting and save for later reassembly.

5.Thread the propane/LP gas orifice into the propane/LP gas air-mixer fitting using a

3/8" deep socket driver. Note: LP gas air- mixer fitting has six (6) holes. The natural gas fitting has no holes.

6.Apply a light amount of propane/LP resis- tant sealant to both threaded ends of LP air-mixer fitting.

7.Thread large threaded end of propane/

LP air-mixer fitting into burner tube and tighten with 7/8" wrench until flange is fully-seated into bracket.

8.Replace 3/8" flare adapter onto exposed thread on propane/LP gas air-mixer fit- ting. Use 7/8" back-up wrench on fitting to prevent turning burner tube.

9.Retighten flare fitting on flexible manifold tube with the 3/4" open-end wrench and 7/8" back-up wrench.

10.Reattach pilot shield onto burner bracket with screw removed in step 1.

3/8" Deep Socket

Propane/LP

Gas Orifice

	Propane/LP
	Gas Air-
Flange	Mixer Fitting
	Pilot Burner
	Shield

#10 Phillips

Burner Screw

Bracket

		3/8" Flare
		Adapter
Burner	7/8" Back-Up
Tube	Wrench	3/8" Flare Fitting
Natural Gas

Orifice Fitting

Figure 4 - Removing/Replacing Main

Burner Orifice

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