GF - D 12
Gas Valves
Figure 31
Figure 32
Step 8
Once the first stage gas pressure is adjusted, turn
the gas valve switch to the OFF position (Figure 32).
Operate the furnace for two more minutes to cool down
the heat exchanger.
Step 9
The furnace IFC will stop the first stage 50% duty
heating cycle after ten minutes. To manually exit the
first stage contingency cycle, remove 115 VAC power
from the furnace. Do not re-power the furnace until
the Green LED on the Inducer Motor Drive Board goes
out.
Step 10
Turn the gas valve switch to the ON position and apply
115 VAC power to the furnace (Figure 33).
Figure 29
Step 6
Read the first stage manifold gas pressure after the
furnace’s temperature rise has stabilized (Figure 30).
Step 7
If needed, remove the first stage pressure adjustment
cover and adjust the gas valve’s first stage of heat
pressure adjustment screw to obtain the correct first
stage pressure (Figure 31). Use Manifold Pressure
Settings Table 7 for the correct first stage pressure
reading in inches of Water Column pressure.
FIRST STAGE ADJUSTMENT: CLOCKWISE TO
DECREASE OR COUNTERCLOCKWISE TO
INCREASE PRESSURE.
Figure 30
Table 7
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