V8205, VR8205 DIRECT IGNITION COMBINATION GAS CONTROLS
69-0329—05
6
3.
If necessary, adjust the pressure regulator to
match the appliance rating. Refer to Table 5 or 6 for
the factory set nominal outlet pressures and
adjustment setting ranges.
a. Remove the pressure regulator adjustment cap
screw.
b. Using a screwdriver, turn the inner adjustment
screw clockwise
to increase or counter-
clockwise
to decrease the main burner
gas pressure.
c. Always replace the cap screw and tighten
firmly to safeguard proper operation.
4.
If desired outlet pressure or flow rate cannot be
achieved by adjusting the gas control, check gas
control inlet pressure using a manometer at the
gas control inlet pressure tap. If inlet pressure is in
the normal range (see Table 5 or 6), replace gas
control. Otherwise, take the necessary steps to
provide proper gas pressure on the control.
Slow-opening and Step-opening Pressure
Regulators
1.
Check the full rate manifold pressure listed on the
appliance nameplate. Gas control full rate outlet
pressure should match this rating.
2.
With main burner operating, check gas control flow
rate using the meter clocking method or pressure
using a manometer connected to the outlet pres-
sure tap on the gas control. See Fig. 4.
3.
If necessary, adjust the pressure regulator to
match the appliance rating. Refer to Table 5 or 6 for
factory set nominal outlet pressures and adjust-
ment ranges.
a. Remove the pressure regulator adjustment cap
screw.
a. Using a screwdriver, turn the inner adjustment
screw clockwise
to increase or counter-
clockwise
to decrease the main burner
gas pressure.
a. Always replace the cap screw and tighten
firmly to safeguard proper operation.
4.
If desired outlet pressure or flow rate can not be
achieved by adjusting the gas control, check gas
control inlet pressure using a manometer at the
gas control inlet pressure tap. If inlet pressure is in
the normal range (see Table 5 or 6), replace gas
control. Otherwise, take the necessary steps to
provide proper gas pressure to the control.
5.
STEP-OPENING PRESSURE REGULATORS ONLY.
Carefully check burner lightoff at step pressure.
Make sure burner lights smoothly and without
flashback to orifice. Make sure all ports remain lit.
Cycle burner several times, allowing at least 30
seconds between cycles for regulator to resume
step function. Repeat after allowing burner to cool.
Readjust full rate outlet pressure if necessary to
improve lightoff characteristics.
Check Safety Lockout (Slow-OOpening
Controls Only)
1.
With the system power off and the thermostat set
to call for heat, manually shut off the gas supply.
2.
Energize ignitor control and start timing safety
lock-out time. When spark ignition terminates, stop
timing.
When using the VR8205H step-opening control, the
specified ignitor control safety lockout time must
exceed 8.5 seconds for system to function prop-
erly.
3.
After spark cutoff, manually reopen gas control
knob. No gas should flow to the main burner.
4.
Reset system by adjusting thermostat below room
temperature, waiting 30 seconds, and moving ther-
mostat setting up to call for heat. Normal ignition
should occur.
Check Safety Shutdown Performance
WARNING
Fire or Explosion Hazard
Can cause property damage, severe injury, or
death.
Perform the safety shutdown test anytime work is
done on a gas system.
NOTE:
Read steps 1 through 7 below before starting
and compare to the safety shutdown or safety
lockout tests recommended for the direct igni-
tion (DI) module. Where they differ, use the pro-
cedure recommended for the module.
Table 5. Pressure Regulator Specification Pressures in Inches wc.
Model Type
Type of Gas
Nominal Inlet
Pressure Range
Factory Set Nominal Outlet
Pressure
Setting Range
Step
Full Rate
Step
Full Rate
Standard, slow
Natural
5.0 - 7.0
—
3.5
—
3.0 - 5.0
LP
12.0 - 14.0
—
10.0
—
8.0 - 12.0
Step
Natural
5.0 - 7.0
0.9
3.5
None
3.0 - 5.0
LP
12.0 - 14.0
2.2
10.0
None
8.0 - 12.0
Table 6. Pressure Regulator Specification Pressures in kPa.
Model Type
Type of Gas
Nominal Inlet
Pressure Range
Factory Set Nominal Outlet
Pressure
Setting Range
Step
Full Rate
Step
Full Rate
Standard, slow
Natural
1.2 - 1.7
—
0.9
—
0.7 - 1.2
LP
2.9 - 3.9
—
2.5
—
2.0 - 3.0
Step
Natural
1.2 - 1.7
0.2
0.9
None
0.7 - 1.2
LP
2.9 - 3.9
0.5
2.5
None
2.0 - 3.0
