69-1059
9
SV9540; SV9640 SmartValve™ SYSTEM CONTROLS
1. Remove pilot adjustment cover screw. See Fig. 4.
2. Pilot adjustment is shipped at full flow rate. Turn the
inner adjustment screw clockwise
if the inlet
pressure is too high. Turn the inner adjustment
screw clockwise to decrease or counterclock-
wise to increase pilot flame.
3. Replace the cover screw after the adjustment to
prevent gas leakage.
STARTUP AND CHECKOUT
Ignition System Control Switch Settings
Ignition system control switch settings are as follows:
OFF prevents pilot and main gas flow through the
ignition system control.
ON permits gas to flow through the control body. At the
appropriate time in the appliance operation, main
gas can flow to the main burner.
NOTE:
Controls are shipped with the ignition system
control switch in the ON position. If the appliance
is operated with the ignition system control switch
in the OFF position, the system will respond as if
the air proving switch is stuck in the no airflow
position.
Turn on Main Burner
Follow the instructions provided by the appliance manufac-
turer or turn up the thermostat to call for heat.
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.
CAUTION
Do not spray soap and water solution on the
SmartValve housing. Do not use an excessive
amount of soap and water solution to perform the
gas leak test. These can damage the control.
Gas Leak Test
1. Paint pipe connections upstream of the ignition
system control with rich soap and water solution.
Bubbles indicate a gas leak.
2. If a leak is detected, tighten the pipe connections.
3. Stand clear of the main burner while lighting to
prevent injury caused from hidden leaks that could
cause flashback in the appliance vestibule. Light the
main burner.
4. With the main burner in operation, paint the pipe
joints (including adapters) and the control inlet and
outlet with rich soap and water solution.
5. If another leak is detected, tighten the adapter
screws, joints, and pipe connections.
6. Replace the part if a leak cannot be stopped.
Check and Adjust Pilot Flame
The pilot flame should envelop 3/8 to 1/2 in. (10 to 13 mm)
of the tip of the flame rod. It should also be in continual
contact with the ground electrode. See Fig. 11. If the pilot
flame is small or lazy, or does not touch the ground
electrode, the inlet gas pressure may be too low, or the
pilot 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. The pilot adjustment is shipped at the full pilot
gas flow rate. If pilot adjustment is necessary, proceed as
follows:
Fig. 11. Proper flame adjustment.
Check and Adjust Gas Input and
Burner Ignition
CAUTION
1.
Do not exceed input rating stamped on
appliance nameplate, or manufacturer’s
recommended burner orifice pressure for size
orifice(s) used. Make certain primary air
supply to main burner is properly adjusted for
complete combustion. Follow instructions of
appliance manufacturer.
2.
IF CHECKING GAS INPUT BY CLOCKING
GAS METER: Make certain there is no gas
flow through the meter other than to the
appliance being checked. Other appliances
must remain off with the pilots extinguished (or
that consumption must be deducted from the
meter reading). Convert flow rate to Btuh as
described in form 70-2602, Gas Controls
Handbook, and compare to Btuh input rating
on appliance nameplate.
3.
IF CHECKING GAS INPUT WITH MANOM-
ETER: Make sure the ignition system control
is in the OFF position before removing outlet
pressure tap plug to connect manometer
(pressure gauge). Also move the ignition
system control switch to the OFF position
when removing the gauge and replacing the
plug. Before removing inlet pressure tap plug,
shut off gas supply at the manual valve in the
gas piping to the appliance or, for LP, at the
tank. Also shut off gas supply before discon-
necting manometer and replacing plug.
Repeat Gas Leak Test at plug with main
burner operating.
NOTE:
Check the inlet pressure before adjusting the
pressure regulator.
PROPER FLAME
ADJUSTMENT
HOT SURFACE
IGNITER
FLAME ROD
M3350A
GROUND
ELECTRODE
3/8 TO 1/2 IN.
(10 TO 13 MM)
NOTE: GROUND ELECTRODE MUST NOT TOUCH FLAME
ROD (.050 IN. MINIMUM CLEARANCE). BEND GROUND
ELECTRODE IF NECESSARY. DO NOT BEND FLAME ROD.
