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Installation
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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.
Figure 8
TMB2015N
1 Size Stamped on Burner Orifice
1
BURNER
ORIFICE