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SV9401/SV9402/SV9403, SV9501/SV9502/SV9503, SV9601/SV9602 SMARTVALVE™
Step-Opening (P) Pressure Regulator Models
Step-opening models require you to check and adjust the
full-rate pressure first and then check the step pressure.
The step pressure is not field-adjustable.
1. Carefully check the main burner lightoff to make
sure the burner lights smoothly and all the ports
remain lit.
2. Check the manifold pressure listed on the appliance
nameplate. The ignition system control full rate
outlet pressure should match this rating.
3. With the main burner operating, check the ignition
system control flow using the meter clocking method
or check pressure using a manometer connected to
the output pressure tap on the ignition system
control.
4. Adjust the pressure regulator (if necessary) to match
the appliance rating. See Tables 8A and 8B for
factory set nominal outlet pressure and adjustment
range.
a.
Remove the pressure regulator adjustment
cap screw.
b.
Using a screwdriver, turn the inner adjustment
screw clockwise to increase or counterclock-
wise to decrease the gas pressure to the
burner.
c.
Replace the cap screw and tighten firmly to
prevent gas leakage.
Model Type
Type of Gas
Standard Slow
Step
Convertible
Model Type
Type of Gas
Standard, Slow
Step
Convertible
Table 8A. Pressure Regulator Specification Pressures (in. wc).
Nominal
Inlet
Pressure
Range
NAT
5.0-7.0
LP
12.0-14.0
NAT
5.0-7.0
LP
12.0-14.0
NAT
5.0-7.0
LP
12.0-14.0
Table 8B. Pressure Regulator Specification Pressures (kPa).
Nominal
Inlet
Pressure
Range
NAT
1.2-1.7
LP
2.9-3.9
NAT
1.2-1.7
LP
2.9-3.9
NAT
1.2-1.7
LP
2.9-3.9
5. If the desired outlet pressure or flow rate cannot be
achieved by adjusting the ignition system control,
check the ignition system control inlet pressure
using a manometer at the inlet pressure tap of the
ignition system control. If the inlet pressure is in the
nominal range (Tables 8A and 8B), replace the
ignition system control. Otherwise, take the neces-
sary steps to provide proper gas pressure to the
control.
6. Carefully check the burner lightoff at step pressure
to make sure the burner lights smoothly, without
flashback to the orifice. Make sure all ports remain
lit.
7. Cycle the burner several times, allowing at least 60
seconds between cycles for the regulator to resume
the step function.
8. Repeat steps 6 and 7 after allowing the burner to
cool.
9. Readjust the full rate outlet pressure (if necessary)
to improve lightoff characteristics.
Convertible (R) Models
Models with convertible (NAT/LP) regulators, used for
mobile home applications, are not field-adjustable. Do not
attempt to adjust outlet pressure on these controls. Use
the instructions in this manual for changing between LP
and natural gas.
Factory Set Nominal Outlet
Pressure
Step
Full Rate
—
3.5
—
10.0
0.9
3.5
2.2
10.0
—
3.5
—
10.0
Factory Set Nominal Outlet
Pressure
Step
Full Rate
—
0.9
—
2.5
0.2
0.9
0.5
2.5
—
0.9
—
2.5
11
Setting Range
Step
Full Rate
—
3-5
—
8-12
None
3-5
None
8-12
None
None
None
None
Setting Range
Step
Full Rate
—
0.7-1.2
—
2.0-3.0
None
0.7-1.2
None
2.0-3.0
None
None
None
None
69-1004—2
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