SV9520H SMARTVALVE™ SYSTEM CONTROL LINE VOLTAGE POLARITY SENSE MODELS
7
69-1383
Check and Adjust Gas Input and
Burner Ignition
CAUTION
Equipment Damage Hazard.
Incorrect inputs can damage equipment and
produce erroneous readings.
1. Do not exceed input rating stamped on
appliance nameplate, or manufacturer
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
MANOMETER: 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
disconnecting manometer and replacing plug.
Repeat Gas Leak Test at plug with main burner
operating.
NOTE:
Check the inlet pressure before adjusting the
pressure regulator.
1.
Check the full rate manifold pressure listed on the
appliance nameplate. Ignition system control full
rate outlet pressure should match this rating.
2.
With main burner operating, check the ignition
system control flow rate using the meter clocking
method or check pressure using a manometer
connected to the outlet pressure tap on the ignition
system control. See Fig. 4.
3.
If necessary, adjust the pressure regulator 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
counterclockwise
to decrease the gas
pressure to the burner.
c. Always replace the cap screw and tighten
firmly to prevent gas leakage.
4.
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 ignition system control
inlet pressure tap. If the inlet pressure is in the
nominal range (see Tables 7 and 8), replace the
ignition system control. Otherwise, take the
necessary steps to provide proper gas pressure to
the control.
If the burner firing rate is above 150,000 Btuh on SV9520
models, 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.
MAINTENANCE
WARNING
Fire or Explosion Hazard.
Can cause property damage, severe
injury, or death.
Do not attempt to take the control apart or clean
it. Improper cleaning or reassembly can cause
gas leakage.
Regular preventive maintenance is important in
applications such as in the commercial cooking and
agricultural and industrial industries that place a heavy
load on system controls because:
•
In many such applications, particularly commercial
cooking, the equipment operates 100,000 to 200,000
cycles per year. Such heavy cycling can wear out the
gas control in one to two years.
•
Exposure to water, dirt, chemicals and heat can
damage the gas control and shut down the control
system.
Maintenance frequency must be determined individually
for each application. Some considerations are:
•
Cycling frequency. Appliances that may cycle 20,000
times annually should be checked monthly.
•
Intermittent use. Appliances that are used seasonally
should be checked before shutdown and again before
the next use.
•
Consequence of unexpected shutdown. Where the
cost of an unexpected shutdown would be high, the
system should be checked more often.
•
Dusty, wet, or corrosive environment. Since these
environments can cause the gas control to deteriorate
more rapidly, the system should be checked more
often.
The system should be replaced if:
•
It does not perform properly on checkout or
troubleshooting.
•
The gas control is likely to have operated for more
than 200,000 cycles.
•
The control is wet or looks as if it has been wet.