Bakers Pride Oven DRG-40 Maintenance, Service, Check Safety Shutdown Performance, Type of, Step

VR8105, VR8205, AND VR8305 DIRECT IGNITION COMBINATION GAS CONTROLS

Table 9. Pressure Regulator Specification Pressures (kPa).

			Factory Set Nominal Outlet
	Type of	Nominal Inlet		Pressure				Setting Range
Model Type	Gas	Pressure Range	Step		Full Rate		Step		Full Rate
Standard,	NAT	1.2-1.7	—		0.9		—		0.7-1.2
Slow
	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		—		0.22-0.75 Lowa
					0.9	High			0.75-1.2 High
	LP	2.9-3.9	—		1.2	Low	—		0.9-1.4	Low
					2.5	High			2.0-2.5	High

aLow 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.

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