Middleby Marshall PS555, PS570, PS360 English, Appendix - Instructions for All Gas Conversion Kits

SECTION 3 - SERVICING COMPONENTS

Appendix - Instructions for All Gas Conversion Kits

for Ovens with Wayne Burner, Natural Gas to Propane, 8/00

ENGLISH

IV. PILOT ORIFICE CONVERSION

1.Unscrew the two 1/2" nuts that secure the gas train to the venturi mounting plate. See Figure 4.

2.Unscrew the pilot tube compression nut, and slide it out of the way. Then, pull the tube from the fitting to expose the pilot orifice. See Figure 4.

3.Separate the venturi, mounting plate, and gas train assembly. Leave the main orifice holder attached to the gas train piping assembly.

4.Remove and discard the existing pilot orifice.

5.Slip the kit-supplied pilot orifice into the pilot tube.

6.With the orifice in place, push the tube back into the compression fitting until it bottoms.

7.While holding the tube in place, slide the compression nut into place. Tighten the nut to a snug fit with your fingers.

8.Gently tighten the nut one complete turn with a wrench.

DO NOT OVERTIGHTEN THE COMPRESSION NUT.

9.Toallowthemainorificetobereplaced,donotreassemble the gas train to the venturi and mounting plate at this time.

V. MAIN ORIFICE CONVERSION

1.Unscrew the existing main orifice from its holder using an 11/16” wrench. See Figure 4.

2.Install the kit-supplied main orifice into the holder.

Figure 4

Venturi

Spark cable

Pilot orifice

Compression

nut

Orifice

holder

Main

orifice

1/2” hex nuts

VI. REASSEMBLY

1.Check that the pilot assembly is correctly aligned with the venturi, as shown in Figure 5. If necessary, reposition the pilot assembly.

2.Reassemble the venturi and mounting plate to the gas train assembly. Replace the two 1/2” hex nuts to hold the assembly together.

3.Replace the assembled gas train into the oven. Tighten the gas pipe union (on the inlet side of the combination gas valve) to hold the gas train in place.

	Figure 5
View from side of venturi	View from rear of venturi

Rear edge

of pilot

hood is on centerline of venturi

Pilot hood

3/8” (9.5mm) 11/16” (17.5mm)

4

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