GF - D 5
Gas Valves
Step 4
Let the furnace go through the Stage 1 low heat
learning routine and its temperature rise stabilize. The
temperature rise and learning routine will take
approximately three minutes.
Step 5
Read the Stage 1 low heat manifold gas pressure after
the furnace’s temperature rise has stabilized. (Figure
10)
Figure 10
Step 6
If needed, remove the Stage 1 low heat pressure
adjustment cover and adjust the gas valve’s low heat
pressure adjustment screw to obtain the correct Stage
1 low heat pressure (Figure 11). Use Manifold Pressure
Settings (Table 2) for the correct Stage 1 low heat
pressure reading in inches of Water Column pressure.
STAGE 1 LOW HEAT ADJUSTMENT: CLOCKWISE
TO DECREASE OR COUNTERCLOCKWISE TO
INCREASE PRESSURE.
Figure 11
Table 2
Step 7
Once the Stage 1 low heat gas pressure is adjusted,
turn the gas valve switch to the OFF position. (Figure
12) Operate the furnace for two more minutes to cool
down the heat exchanger.
Figure 12
*For illustration purposes only, refer to product literature for accurate data
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