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VR9205Q DIRECT IGNITION COMBINATION 2-STAGE GAS CONTROLS
Turn On System
Push the on-off switch to the ON position.
Turn On Main Burner
Follow appliance manufacturer's instructions or turn
thermostat up to call for heat.
Check and Adjust Gas Input
and Burner Ignition
IMPORTANT
1. Do not exceed the input rating stamped on appli-
ance nameplate, or manufacturer's recom-
mended burner orifice pressure for size of
orifice(s) used. Make certain primary air supply
to main burner is properly adjusted for complete
combustion. Follow appliance manufacturer's
instructions.
2. IF CHECKING GAS INPUT BY CLOCKING GAS
METER: Make certain there is no gas flow
through the meter other than to the appliance
being checked. Other appliances must remain
off with the pilots extinguished (or deduct their
consumption from the meter reading). Convert
flow rate to Btuh as described in form 70-2602,
Gas Controls Handbook, and compare to Btuh
input rating on appliance nameplate.
3. IF CHECKING GAS INPUT WITH MANOME-
TER: Make sure the gas control is in the OFF
position before removing outlet pressure tap plug
to connect manometer (pressure gauge). Also
move the gas control switch back to the OFF
position when removing the gauge and replacing
the plug. Before removing inlet pressure tap
plug, shut off gas supply at the manual valve in
the gas piping to the appliance or, for LP, at the
tank. Also shut off gas supply before disconnect-
ing manometer and replacing plug. Repeat Gas
Leak Test at plug with main burner operating.
NOTE: Check the inlet pressure before adjusting the
pressure regulator.
Two-stage VR9205 requires that you check and adjust
both high and low pressure regulator settings. Two-stage
appliances operating sequences vary. Consult the
appliance manufacturer's instructions for the specific
operating sequence and regulator adjustment procedure
for the appliance in which the control was installed.
1. Set appliance to operate on high.
2. Carefully check the main burner lightoff. Make sure
that the main burner lights smoothly and that all
ports remain lighted.
3. Check the full rate (high) manifold pressure listed
on the appliance nameplate for high pressure. The
gas control full rate outlet pressure should match
this rating.
4. With main burner operating, check the gas control
flow rate using the meter clocking method or check
pressure using a manometer connected to the
outlet pressure tap on the control.
5. If necessary, adjust the high pressure regulator to
match the appliance rating. See Table 5 for factory-
set nominal outlet pressure and adjustment range.
a. Remove the pressure regulator adjustment cap.
b. Using a screwdriver, turn the inner adjustment
screw for HI pressure clockwise
increase or counterclockwise
decrease the gas pressure to the burner.
69-2143EF—01
6. After high pressure has been checked, check low
pressure regulation. Two-stage appliance operating
sequences vary. Consult the appliance
manufacturer's instructions for the specific
operating sequence and regulator adjustment
procedure for the appliance in which the control is
installed and for instructions on how to prevent the
control from moving to high stage while checking
the low pressure regulator setting.
7. Check the low rate manifold pressure listed on the
appliance nameplate. Gas control low rate outlet
pressure should match this rating.
8. With main burner operating, check the gas control
flow rate as before (using the meter clocking
method or check pressure using a manometer
connected to the outlet pressure tap on the control).
9. If necessary, adjust the low pressure regulator to
match the appliance rating. See Table 5 for factory-
set nominal outlet pressure and adjustment range.
a. Remove the pressure regulator adjustment cap.
b. Using a screwdriver, turn the inner adjustment
screw for LO pressure clockwise
increase or counterclockwise
decrease the gas pressure to the burner.
10. Once the high and low pressure have been
checked and adjusted, replace the pressure
regulator adjustment cap. If the desired outlet
pressure or flow rate cannot be achieved by
adjusting the gas control, check the gas control inlet
pressure using a manometer at the inlet pressure
tap of the gas control. If the inlet pressure is in the
nominal range (see Table 5), replace the gas
control. Otherwise, take the necessary steps to
provide proper gas pressure to the control.
Table 5. Pressure Regulator Specification
Model
Type
of Gas
Two-
NAT
Stage
LP
Check Safety Shutdown
Performance
WARNING
Fire or Explosion Hazard.
Can cause severe injury, death, or property
damage.
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.
to
3. Watch for ignition spark or for glow at hot surface
to
igniter either immediately or following prepurge.
See DI module specifications.
6
Pressures (in. wc).
Nominal
Factory Set
Inlet
Nominal
Type
Pressure
Outlet
Range
Pressure
5.0-7.0
1.7 Low
3.5 High
12.0-14.0 4.9 Low
10.0 High
to
to
Adjustment
Range
0.6–3.0 Low
3.0–5.0 High
2.5–7.0 Low
8.0–11.0 High
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