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PILOT BURNER BODY ON
BRACKET OF PILOT BURNER
COMPRESSION FITTING
BREAKS OFF AND CLINCHES
TUBING AS NUT IS TIGHTENED
TIGHTEN NUT ONE TURN
BEYOND FINGER TIGHT
TO IGNITION
SYSTEM CONTROL
Fig. 7. Always use the new compression fitting.
STARTUP AND CHECKOUT
Perform Gas Leak Test
WARNING
FIRE OR EXPLOSION HAZARD CAN CAUSE
PROPERTY DAMAGE, SEVERE INJURY,
OR DEATH.
Check for gas leaks with soap and water solution any
time work is done on a gas system.
Gas Leak Test:
Make sure the gas supply is turned on at the appliance
service valve.
Paint pipe connections upstream of pilot burner with
rich soap and water solution. Bubbles indicate a gas
leak.
If a leak is detected, tighten the pipe connections.
Set the thermostat to call for heat to light the main
burner.
With the main burner in operation, paint pipe joints
(including adapters) and SV9500/SV9600 control inlet
and outlet with rich soap and water solution.
If another gas leak is detected, tighten adapter screws,
joints, and pipe connections.
Replace part if leak cannot be stopped.
Adjust Pilot Flame
The pilot flame should envelop approximately 3/8 in. (10 mm)
of the sensor tip. See Fig. 8.
To adjust pilot flame:
Turn off system by setting thermostat below the
temperature to call for heat.
Disconnect lead to MV terminal on SV9500/SV9600.
Light pilot by setting the thermostat to call for heat.
Remove pilot adjustment cover screw from gas control.
Turn inner pilot adjustment screw clockwise to
decrease or counterclockwise to increase pilot flame.
Always replace pilot adjustment cover screw and
tighten firmly after completing adjustment to assure
proper operation.
Q3450A,B,C,D,E,F,G AND Q3480B,C, SmartValve
M2687A
7
™
PROPER FLAME
ADJUSTMENT
Fig. 8. Sensor tip must be in pilot flame.
SERVICE
WARNING
FIRE OR EXPLOSION HAZARD CAN CAUSE
PROPERTY DAMAGE, SEVERE INJURY,
OR DEATH
Perform Gas Leak Test any time work is done to the
system.
Pilot Outage
If pilot flame goes out during ignition, but is properly
adjusted, recheck mounting and location instructions in
Location section.
If all mounting and location instructions are followed but
the pilot continues to go out, construct a shield to
protect the pilot flame from the main burner ignition,
extinction and drafts. See Fig. 9
TYPICAL
SHIELD
Fig. 9. Proper shielding of pilot flame.
Check pilot and main burner lightoff.
Set the thermostat to call for heat.
Watch the pilot burner during the ignition sequence
to determine if:
• Igniter continues to glow red after the pilot is lit.
• The pilot lights and the igniter stops glowing red,
but main burner does not light.
SYSTEM PILOT BURNERS
3/8 INCH
(10 mm)
SENSOR
IGNITER
M9049
M2686
68-0125—2
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