Standard-Opening and Slow-Opening Pressure Regulator
1. The gas control outlet pressure should match the
manifold pressure listed on the appliance nameplate.
2. With the main burner operating, check the gas control
flow rate using the meter clocking method or check the gas
pressure using a manometer connected to the gas control
outlet pressure tap. Refer to Fig. 4.
3. If necessary, adjust the pressure regulator to match the
appliance rating. Refer to Table 7 or 8 for the factory set
nominal outlet pressures and adjustment ranges.
a. Remove the pressure regulator adjustment cap and
screw.
b. Using a screwdriver, turn the inner adjustment
screw clockwise to increase or counterclock-
wise
to decrease the main burner gas pressure.
c. Always replace the cap screw and tighten firmly to
assure proper operation.
4. If the desired outlet gas pressure or gas flow rate cannot
be achieved by adjusting the gas control, check the gas
control inlet pressure using a manometer at the inlet pressure
tap. If the inlet pressure is in the normal range (refer to Table
7 or 8), replace the gas control. Otherwise, take the necessary
steps to provide proper gas pressure to the gas control.
Step-Opening Pressure Regulator
1. The gas control outlet pressure should match the
manifold pressure listed on the appliance nameplate.
2. With main burner operating, check the gas control
flow rate using the meter clocking method or check the gas
pressure using a manometer connected to the gas control
outlet pressure tap. Refer to Fig. 4.
3. If necessary, adjust the pressure regulator to match
the appliance rating. Refer to Table 7 or 8 for factory set
nominal outlet pressures and adjustment ranges.
a. Remove the pressure regulator adjustment cap screw.
b. Using a screwdriver, turn the inner adjustment screw
clockwise
to increase or counterclockwise
to decrease the main burner gas pressure.
c. Always replace the cap screw and tighten firmly to
assure proper operation.
4. If desired outlet pressure or flow rate cannot be
achieved by adjusting the gas control, check the inlet
pressure using a manometer at inlet pressure tap or up-
stream of the gas control. If the inlet pressure is in the
normal range (refer to Table 7 or 8), replace the existing gas
control. Otherwise, take the necessary steps to provide
proper gas pressure to the gas control.
5. Carefully check main burner lightoff at the step
pressure. Assure the main burner lights smoothly and
without flashback to the orifice and that all ports remain lit.
Cycle the main burner several times, allowing at least 30
seconds between cycles for the regulator to resume the step
function. Repeat after allowing main burner to cool.
Readjust the full rate outlet pressure if necessary to im-
prove lightoff characteristics.
TABLE 5—PRESSURE REGULATOR SPECIFICATION PRESSURES IN in.
Outlet Pressure
Nominal Factory
Nominal Inlet
Setting
Setting Range
Type of
Pressure
Full
Full
Model
Gas
Range
Step
Rate
Step
Rate
Standard-,
Natural
5.0 - 7.0
—
3.5
—
3.0 - 5.0
Slow-opening
LP
12.0 - 14.0
—
10.0
—
8.0 - 12.0
Step-
Natural
5.0 - 7.0
0.9
3.5
—
3.0 - 5.0
opening
LP
12.0 - 14.0
2.2
10.0
—
8.0 - 12.0
TABLE 6—PRESSURE REGULATOR SPECIFICATION PRESSURES IN kPa.
Outlet Pressure
Nominal Factory
Nominal Inlet
Setting
Setting Range
Type of
Pressure
Full
Full
Model
Gas
Range
Step
Rate
Step
Rate
Standard-,
Natural
1.2 - 1.7
—
0.9
—
0.7 - 1.2
Slow-opening
LP
2.9 - 3.9
—
2.7
—
2.0 - 3.0
Step-
Natural
1.2 - 1.7
0.2
0.9
—
0.7 - 1.2
opening
LP
2.9 - 3.9
0.9
2.7
—
2.0 - 3.0
CHECK SAFETY SHUTDOWN PERFORMANCE
WARNING
FIRE OR EXPLOSION HAZARD CAN
CAUSE PROPERTY DAMAGE, SEVERE
INJURY, OR DEATH
Perform the safety shutdown test any time work is
done on a gas system.
1. Place gas control knob in PILOT position. Main
burner should go off and pilot should remain lit.
2. Extinguish pilot flame. Pilot gas flow should stop
within 2-1/2 minutes. Safety shutoff of pilot gas proves
complete shutdown since safety shutoff valve prevents
main burner and pilot gas flow.
3. Relight pilot burner and operate system through one
complete cycle to assure all controls operate properly.
7
69-0683—1
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