Honeywell VR8345M Manual page 12

VR8345M
STARTUP AND CHECKOUT
CAUTION
Stand clear while lighting main burner to prevent
injury caused from hidden gas leaks that could
cause flashback in the appliance vestibule.
3. Turn on the system by rotating the gas control knob
counterclockwise
4. Light the main burner by following the appliance
manufacturer instructions or turning up the thermostat to call
for heat.
5. With the main burner in operation, paint all pipe joints
and gas control inlet and outlet with a rich soap and water
solution.
6. If another gas leak is detected, tighten joints and pipe
connections.
7. If gas leak cannot be stopped, turn the gas control knob
clockwise to OFF.
8. Replace the leaking part.
9. Perform the gas leak test.
ADJUST THE PILOT BURNER FLAME (INTER-
MITTENT PILOT IGNITION ONLY)
The pilot flame should envelop 3/8 to 1/2 in. (10 to
13 mm) of the igniter-sensor tip. See Fig. 12. To adjust the
pilot flame:
1. Remove the pilot adjustment cover screw. Refer to
Fig. 4.
2. Turn the inner adjustment screw clockwise
decrease or counterclockwise
3. To prevent gas leakage, always replace the cover
screw after adjustment.
Fig. 12—Proper flame adjustment.
3/8 TO 1/2 INCH
(10 TO 13 mm)
IGNITER-
SENSOR
M3080A
68-0160
to ON.
to increase pilot flame.
PROPER FLAME
ADJUSTMENT
CHECK AND ADJUST GAS INPUT TO MAIN
BURNER
CAUTION
1. Do not exceed the input rating stamped on the
appliance nameplate, or manufacturer recom-
mended burner orifice pressure for the size
orifice(s) used. Make certain the primary air
supply to the main burner is properly adjusted
for complete combustion (refer to the appliance
manufacturer instructions).
2. WHEN CHECKING GAS INPUT BY
CLOCKING THE GAS METER:
• Make sure that the only gas flow through the
meter is that of the appliance being checked.
• Make certain that other appliances are turned
off with pilot burners extinguished (or de-
duct that gas consumption from the meter
reading).
• Convert the flow rate to Btuh as described in
Gas Controls Handbook, form 70-2602, and
compare to the Btuh input rating on the
appliance nameplate.
3. WHEN CHECKING GAS INPUT WITH A
MANOMETER (PRESSURE GAUGE):
• To connect the manometer, be sure the gas
control knob is in the OFF position before
removing the outlet pressure tap plug.
• When removing the manometer, turn the gas
to
control knob back to OFF and replace the
outlet pressure tap plug.
• Shut off the gas supply at the appliance
service valve, or at the gas tank for LP gas,
before removing the outlet pressure tap plug
and before disconnecting the manometer and
replacing the outlet pressure tap plug.
• Perform the Gas Leak Test at the outlet
pressure tap plug.
Standard-Opening Pressure Regulator
1. The gas control outlet pressure should match the
manifold pressure listed on the appliance nameplate.
2. With the main burner operating, check the gas control
flow rate by using the meter clocking method or check the
gas pressure using a manometer connected to the gas control
outlet pressure tap. See Fig. 4.
3. If necessary, adjust the pressure regulator to match the
appliance rating. Refer to Table 5 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 decrease the main burner gas pressure.
c. Always replace the cap screw and tighten firmly to
safeguard proper operation.
12
to increase or counterclockwise