GF - D 7
Gas Valves
Step 15
Replace and tighten the adjustment cover for the high
heat manifold adjustment screw and then read the
manifold pressure again. This procedure may need to
be repeated until the manifold gas pressure is 3.5" of
Water Column pressure.
Step 16
If the firing rate cannot be obtained with the manifold
pressures specified in Table 2 (page 5), check inlet
gas piping for proper sizing and pressure. If insufficient,
correct and/or contact gas company to adjust input
pressure.
NOTE: The adjustment cover over the Stage 2
100% (high) heat pressure adjustment screw must
be in place during manifold gas pressure
readings.
Step 18
Remove 115 VAC power from the furnace. Do not
repower the furnace until the green LED on the inducer
motor drive board goes out. (Figure 18)
Step 17
Once the Stage 2 gas pressure is adjusted, turn the
gas valve switch to the OFF position (Figure 17).
Operate the furnace for two more minutes to cool down
the heat exchanger.
Figure 17
Figure 18
Step 19
Turn the gas valve switch to the ON position. Remove
the field supplied manometer tubing, 1/8" NPT barbed
fitting, and the tee installed at the beginning steps.
TIGHTEN DOWN THE MANIFOLD ADJUSTMENT
COVERS AND REINSTALL THE MANIFOLD
PRESSURE MEASUREMENT FITTING.
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