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SV9401/SV9402/SV9403, SV9501/SV9502/SV9503, SV9601/SV9602 SMARTVALVE™
orifice may be partially clogged. Check and repair as
necessary. If the pilot flame is hard and noisy, the inlet gas
pressure may be too high. The ignition system control has
a pilot adjustment mechanism to reduce the pilot flow, if
necessary. Use the following procedure:
1. Remove pilot adjustment cover screw. See Fig. 4.
NOTE: Pilot adjustment is shipped at full flow rate.
2. Turn the inner adjustment screw clockwise if the
inlet pressure is too high.
NOTE: If the adjustment screw is used to reduce
pilot flow rate, the pilot flame can become
too small for reliable system operation if
the system inlet pressure drops signifi-
cantly.
3. Replace the cover screw after the adjustment to
prevent gas leakage.
PROPER FLAME
ADJUSTMENT
NOTE: GROUND ELECTRODE MUST NOT TOUCH FLAME
ROD (.050 IN. MINIMUM CLEARANCE). BEND GROUND
ELECTRODE IF NECESSARY. DO NOT BEND FLAME ROD.
Fig. 12. Proper flame adjustment.
Check and Adjust Gas Input and Burner
Ignition
IMPORTANT
1. Do not exceed input rating stamped on the
appliance nameplate.
2. Do not exceed manufacturer's recommended
burner orifice.
3. Make certain primary air supply to main burner is
adjusted properly for complete combustion.
4. Follow appliance manufacturer instructions.
Checking Gas Input by Clocking Gas Meter
IMPORTANT
1. Make sure there is no gas flow through the meter
except to the appliance being checked. Other
appliances must remain off with their pilot lights
extinguished. Otherwise, subtract that usage
from the meter reading.
2. Convert the flow rate to Btuh as described in Gas
Controls Handbook, form 70-2602.
3. Compare actual Btuh to the input rate on the
appliance nameplate.
69-1004—2
3/8 TO 1/2 IN.
(10 TO 13 MM)
GROUND ELECTRODE
FLAME ROD
HOT SURFACE IGNITER
M3350A
Checking Gas Input with Manometer
IMPORTANT
1. Make sure the ignition system control is in the
OFF position before removing outlet pressure tap
plug to connect manometer (pressure gauge).
2. Shut off gas supply at the manual valve in the
gas piping to the appliance or, for LP, at the tank.
3. Move the ignition system control switch to the
OFF position when removing the gauge and
replacing the plug.
4. Remove inlet pressure tap plug.
5. Shut off gas supply.
6. Disconnect manometer and replace plug.
7. Repeat Gas Leak Test at plug with main burner
operating.
NOTE: Check the inlet pressure before adjusting the
pressure regulator.
Standard (M) and Slow-Opening (H) Pressure
Regulator Models
1. Carefully check the main burner lightoff to make
sure the burner lights smoothly and all the ports
remain lit.
2. Check the full rate 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.
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.
NOTE: If the burner firing rate is above 85,000 Btuh on
SV9401/SV9402/SV9403 or 150,000 Btuh for
SV9501/SV9502/SV9503 models (see Table 2
for SV9601/SV9602 capacities), it may not be
possible to deliver the desired outlet pressure.
This is an application issue, not a control failure.
Take whatever steps are required to correct the
situation.
10
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