64659-001 REV. A 07/06/18
18
To measure the pressure:
Locate the appropriate pressure tap:
The pressure taps are on top of the
valve near the modulating coil (see
illustration). The manifold pressure is
measured from the tap nearest to the
valve outlet. The other tap can be used
to check inlet pressure.
Shut off gas to the appliance.
Unscrew the manifold pressure tap
screw 1.5 to 2 turns counterclockwise.
Slip the measuring hose of the
manometer over the tap.
To set the high pressure setting:
Determine the recommended manifold gas
pressure setting based on table at right.
Locate the 8mm high pressure adjustment
nut. This is the larger nut located on the
valve coil.
Set the appliance to call for full fire.
After the burner ignites, turn the high
pressure nut counterclockwise until the
outlet gas pressure is below the desired
outlet gas pressure setting, then turn
clockwise until desired pressure is achieved.
Careful! Do not over-tighten. Stop if
additional clockwise turning does not
noticeably increase the outlet pressure.
Table 9 - Recommended Manifold Pressure Settings
Figure 8 - Pressure Tap Locations
Figure 9 - Gas Pressure Adjustments
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