69-0624—2 8
TABLE 8—PRESSURE REGULATOR SPECIFICATION PRESSURES IN IN. WC.
TABLE 9—PRESSURE REGULATOR SPECIFICATION PRESSURES IN kPa.
CHECK SAFETY SHUTDOWN PERFORMANCE
WARNING
FIRE OR EXPLOSION HAZARD CAN
CAUSE PROPERTY DAMAGE, SEVERE
INJURY, OR DEATH
Perform the safety shutdown test any time work is
done on a gas system.
1. Place the gas control knob in the PILOT position.
Main burner should go off and pilot should remain lit.
2. Extinguish pilot flame. Pilot gas flow should stop
within 2-1/2 minutes. Safety shutoff of pilot gas proves
complete shutdown because safety shutoff valve prevents
main burner and pilot gas flow.
3. Relight pilot burner and operate system through one
complete cycle to make sure all controls operate properly.
Maintenance
WARNING
FIRE OR EXPLOSION HAZARD CAN
CAUSE PROPERTY DAMAGE, SEVERE
INJURY, OR DEATH
Improper cleaning or reassembly can cause gas
leakage. When cleaning, be sure that control is
reassembled properly and perform gas leak test.
Regular preventive maintenance is important in applica-
tions such as in the commercial cooking and agricultural and
industrial industries that place a heavy load on system con-
trols, 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 dam-
age the gas control and shut down the control system.
The maintenance program should include regular check-
out of the gas control as outlined in Start-up and Checkout
section, checkout the control system as described in the
appliance manufacturers literature. Maintenance frequency
must be determined individually for each application. Some
considerations are:
•Cycling frequency. Appliances that may cycle 100,000
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 gas control should be replaced if:
• It does not perform properly on checkout or trouble-
shooting.
• The gas control knob is hard to turn or push down, or
it fails to pop back up when released.
• The gas control is likely to have operated for more than
200,000 cycles.
Outlet Pressure
Nominal Inlet Pressure Nominal Inlet
Nominal Factory Setting Setting Range
Model
Type of Gas Pressure Range
Step Full Rate Step Full Rate
Standard,
Natural 5.0 - 7.0 — 3.5 — 3.0 - 5.0
Slow opening
LP 12.0 - 14.0 — 11.0 — 8.0 - 12.0
Step-opening Natural 5.0 - 7.0 0.9 3.5 — 3.0 - 5.0
LP 12.0 - 14.0 2.2 11.0 — 8.0 - 12.0
Outlet Pressure
Nominal Inlet
Nominal Factory Setting Setting Range
Model
Type of Gas Pressure Range
Step Full Rate Step Full Rate
Standard,
Natural 1.2 - 1.7 — 0.9 — 0.7 - 1.2
Slow opening
LP 2.9 — 2.7 — 2.0 - 3.0
Step-opening Natural 1.2 - 1.7 0.2 0.9 — 0.7 - 1.2
LP 2.9 - 3.9 0.9 2.7 — 2.0 - 3.0
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