42
Check the Gas Supply Pressure
1. Slowly turn on main gas shut-off valve.
2. Read the gas supply pressure from the manome-
ter; minimum supply pressure is 4 in. WC,
recommended supply is 7 in. WC for natural gas
(minimum 11.0 in. WC for LP gas).
3. If pressure is > 14 in. WC, turn off the valve.
4. Check if the service regulator is installed and/or
adjust the service regulator.
Start-Up
Blower Adjustment
1. A nylon tee fitting is connected with hoses in-line
with the air pressure switches. Disconnect the
plugged side and connect a manometer.
2. Close the gas valve.
3. Turn power on.
4. During startup or Lo-Fire, the air pressure should
read 0.45±0.05 in. WC. During Hi-Fire, the read-
ing should be between 0.9 in. WC and 1.2 in. WC.
If these are not the ob served manometer read-
ings, adjust the air shutter on the blower to attain
the correct values. (See Fig. 4, air shutter adjust-
ment).
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