Bakers Pride DRG-40 - Manual (Page 37)

VR8105, VR8205, AND VR8305 DIRECT IGNITION COMBINATION GAS CONTROLS
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Table 9. Pressure Regulator Specification Pressures (kPa).
a Low Fire setting range for VR8305Q 1/2 in. by 1/2 in. and 1/2 in. by 3/4 in. is 0.37 to 0.75 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.
NOTE: Read steps 1 through 7 before starting, and
compare to the safety shutdown or safety
lockout tests recommended for the direct
ignition (DI) module. Where different, use the
procedure recommended for the module.
1. Turn off gas supply.
2. Set thermostat or controller above room
temperature to call for heat.
3. Watch for ignition spark or for glow at hot surface
igniter either immediately or following prepurge.
See DI module specifications.
4. Time the length of spark operation. See the DI
module specifications.
5. After the module locks out, open the manual gas
cock and make sure no gas is flowing to the main
burner.
6. Set the thermostat below room temperature and
wait one minute.
7. 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.
Do not disassembly the gas control; it contains no
replaceable components. Attempted
disassembly, repair, or cleaning can damage the
control, resulting in gas leakage.
Regular preventive maintenance is important in
applications 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.
The maintenance program should include regular
checkout of the control as outlined in the Startup and
Checkout section, and the control system as described in
the appliance manufacturer literature.
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 environments. 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.
SERVICE
WARNING
Fire or Explosion Hazard.
Can cause property damage, severe injury
or death.
Do not disassemble the gas control; it contains no
replaceable components. Attempted
disassembly, repair, or cleaning can damage the
control, resulting in gas leakage.
Model Type
Type of
Gas
Nominal Inlet
Pressure Range
Factory Set Nominal Outlet
Pressure Setting Range
Step Full Rate Step Full Rate
Standard,
Slow NAT 1.2-1.7 — 0.9 — 0.7-1.2
LP 2.9-3.9 — 2.5 — 2.0-3.0
Step NAT 1.2-1.7 0.2 0.9 None 0.17-0.48
LP 2.9-3.9 0.5 2.5 None 1.4-1.37
Two-stage NAT 1.2-1.7 — 0.48 Low
0.9 High — 0.22-0.75 Low a
0.75-1.2 High
LP 2.9-3.9 — 1.2 Low
2.5 High — 0.9-1.4 Low
2.0-2.5 High
69-1226-2.fm Page 10 Thursday, November 13, 2003 12:50 PM