21
Figure 12.1, Gas Valve Pressure Check Taps
IMPORTANT
Pressure check taps for manifold (outgoing) and inlet (incoming) pressure have been incorporated into the valve. The pressure tap
marked OUT measures outgoing pressure. The pressure tap marked IN measures incoming pressure.
NOTE
The appliance and its appliance main gas valve must be disconnected from the gas supply piping system during any pressure testing of
the system at test pressures in excess of 1/2 psi (3.5 kPa).
NOTE
Make sure to apply the incoming pressure test with all other gas appliances on or at full capacity in the house for a proper pressure
reading.
If the inlet pressure reading is too high or too low, contact the gas company. Only a qualified gas service technician should adjust
incoming gas pressure. A low pressure reading can cause a delayed ignition.
1. Loosen the inlet (IN) pressure tap by turning screw counter-clockwise. See (A) in Figure 12.1.
2. Attach manometer using a 1/4 in. (6 mm) I.D. hose.
3. Light pilot.
4. Turn the gas control knob to ON. Burner should not light. Note manometer reading.
5. Press the rocker switch to ON. Check pressure to ensure it is near maximum inlet pressure.
4. Press the rocker switch to OFF.
5. Turn the gas control knob to OFF.
6. Disconnect hose and tighten the inlet (IN) pressure tap by turning screw clockwise. Screw should be snug. Do not over tighten.
7. Relight pilot and turn the gas control knob to ON. Reattach manometer to the inlet pressure tap (A) to verify the tap is
completely sealed. Manometer should read no pressure.
1. Light pilot.
2. Loosen manifold (OUT) pressure tap by turning screw counter-clockwise. See (B) in Figure 12.1.
3. Attach manometer to pressure tap using a 1/4 in. (6 mm) I.D. hose.
4. Turn gas control knob to ON.
5. Press the rocker switch to ON and note manometer reading.
6. Disconnect manometer hose and tighten the manifold (OUT) pressure tap by turning screw clockwise. Screw should be snug.
Do not over tighten.
7. Attach the manometer to the manifold pressure tap (B) to verify it is completely sealed. The manometer should read no
pressure when the rocker switch is pressed to ON.
12.0
ADJUSTMENT
12.1
Pressure Testing
12.1.1
Inlet Pressure Test
12.1.2
Manifold Pressure Test
Table 12.1, Incoming Pressures
Fuel
Natural Gas
LP Gas
Gas Supply
Min - Max
Min - Max
Inlet Pressure Tap (A)
5” - 10.5” WC
(1.25 - 2.62 kPa)
11” - 13” WC
(2.74 - 3.24 kPa)
Table 12.2, Outgoing Pressures
Fuel
Natural Gas
LP Gas
Gas Supply
Low - High
Low - High
Manifold Pressure Tap (B)
1.6” - 3.5” WC
(0.40 - 0.87 kPa)
6.4” - 10” WC
(1.59 - 2.49 kPa)
A
B
