Installation

How to Change Burner Orifice Size

1.Disconnect electrical power from tumbler. Close gas shut-off valve to tumbler. Refer to Figure 6.

2.For Johnson GM7000 gas valve:

Remove burner orifice(s) from the spud holder. Refer to Figure 7.

3.Install the new, correct burner orifices. Refer to Figure 8. Torque each to 9 – 10 Nm.

4.Commission tumbler for use.

NOTE: Blank burner orifices are available as Part

No. M400995.

How to Adjust Gas Valve Governor/Regulator

1. Check gas burner orifice (manifold) pressure as follows. Refer to Figure 7.

2. Loosen screw plug inside pressure tap located on underside of valve.

3. Connect a “U”- tube manometer (or similar pressure gauge) to the tap.

4. Start tumbler and note pressure once flame is

burning. Remove regulator cap and adjust regulator screw until the injector pressure per applicable table is achieved. Replace regulator cap and close needle valve (pressure tap).

5. Commission tumbler for use.

1

BURNER

ORIFICE

TMB2015N

1Size Stamped on Burner Orifice

Figure 8

70304601

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