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TABLE 7—PRESSURE REGULATOR SPECIFICATION PRESSURES IN INCHES WC.
Model
Type of Gas
Standard-,
NATURAL
Slow-opening
Step-
NATURAL
opening
TABLE 8—PRESSURE REGULATOR SPECIFICATION PRESSURES IN kPa.
Model
Type of Gas
Standard-,
NATURAL
Slow-opening
Step-
NATURAL
opening
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. 1.
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
counterclockwise
gas pressure.
c. Always replace the cap screw and tighten firmly to
ensure 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. 1.
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 adjust-
ment screw clockwise
Nominal
Inlet
Pressure
Range
5.0 - 7.0
LP
12.0 - 14.0
5.0 - 7.0
LP
12.0 - 14.0
Nominal
Inlet
Pressure
Range
1.2 - 1.7
LP
2.9 - 3.9
1.2 - 1.7
LP
2.9 - 3.9
to
increase
to decrease the main burner
to increase or
Nominal
Factory Setting
Step
Full Rate
—
—
0.9
2.2
Nominal
Factory Setting
Step
Full Rate
—
—
0.2
0.9
counterclockwise
gas pressure.
c. Always replace the cap screw and tighten firmly to
ensure 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 upstream 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 pres-
sure. Ensure the main burner lights smoothly and without
flashback to the orifice and that all ports remain lit. Cycle the
or
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 improve lightoff character-
istics.
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 ensure all controls operate properly.
7
Outlet Pressure
Setting Range
Step
3.5
—
10.0
—
3.5
—
10.0
—
Outlet Pressure
Setting Range
Step
0.9
—
2.7
—
0.9
—
2.7
—
to decrease the main burner
Full Rate
3.0 - 5.0
8.0 - 12.0
3.0 - 5.0
8.0 - 12.0
Full Rate
0.7 - 1.2
2.0 - 3.0
0.7 - 1.2
2.0 - 3.0
69-0661—1
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