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VR8104, VR8204 AND VR8304 INTERMITTENT PILOT COMBINATION GAS CONTROLS
11 69-1225—4
Table 8B. Pressure Regulator Specification Pressures (kPa).
a
Low Fire setting range for VR8304Q 1/2 in. by 1/2 in. and 1/2 in. by 3.4 in. is 0.37 to 0.75 kPa.
Non-Regulating On-Off (U) Models
Non-regulating VR8204U Valves are designed for
application in various parts of Europe where a separate,
distinct, pressure regulator is required. The VR8204U is
similar to the VR8204A in all other aspects and should be
installed accordingly.
MAINTENANCE
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.
Regular preventive maintenance is important for
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 control; it contains no
replaceable components. Attempted
disassembly, repair, or cleaning can damage
the gas control, resulting in gas leakage.
CAUTION
Equipment Damage.
Can burn out valve coil terminals.
Never apply a jumper across (or short) the valve
coil terminals, even temporarily.
After servicing, verify proper system operation.
If Main Burner Does Not Come
On With Call For Heat
1.
Confirm the gas control knob is in the ON position.
2.
Adjust thermostat several degrees above room
temperature.
3.
Using ac voltmeter, check for 24V at gas control:
• If pilot lights, measure across MV/PV and MV.
• If pilot does not light, measure across MV/PV
and PV before safety lockout occurs.
4.
If voltage is incorrect or not present, check control
circuit for proper operation.
5.
If 24V is present, replace gas control.
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 to 1.7 — 0.9 — 0.7 to 1.2
LP 2.9 to 3.9 — 2.5 — 2.0 to 3.0
Step NAT 1.2 to 1.7 0.2 0.9 None 0.17 to 0.48
LP 2.9 to 3.9 0.5 2.5 None 1.4 to 1.37
Two-stage NAT 1.2 to 1.7 — 0.48 Low
0.9 High
—
0.22 to 0.75 Low
a
0.75 to 1.2 High
LP 2.9 to 3.9 — 1.2 Low
2.5 High
— 0.9 to 1.4 Low
2.0 to 2.5 High