Troubleshooting; Service Information - Honeywell V4730C Manual

V4730C/V8730C/V4734C 1:1 Gas/Air Servo Regulated Gas Valves

TROUBLESHOOTING

WARNING
Electrical Shock Hazard. Can cause severe inju-
ry, death or property damage.
Use extreme caution when troubleshooting; line volta-
ge is present.
IMPORTANT
Do not replace the valve until all other sources of
trouble are eliminated.
Troubleshooting Procedure
If the valve does not open when the thermostat or controller
calls for heat:
1. Check for voltage at the valve leadwires or terminal block.
2. If there is no voltage at the valve leadwires or terminal block,
make sure:
2.a voltage is connected to the master switch.
2.b master switch is closed and overload protection (circuit
breaker, fuse, or similar device) has notopened the po-
wer line.

SERVICE INFORMATION

WARNING
Explosion Hazard and Electrical Shock Hazard.
Can cause severe injury, death or property da-
mage.
Turn off gas supply and disconnect all electrical power
to the valve before servicing.
IMPORTANT
Only trained, experienced, flame safeguard technici-
ans should attempt to service or repair flame safe-
guard controls and burner assemblies.
Scheduled Inspection and Maintenance
Set up and follow a schedule for periodic inspection and mainte-
nance, including the burner, all other controls and the valves. It is
recommended that the valve leak test in the Checkout section be
included in this schedule. Refer to the instructions for the primary
safety control (s) 0 for more inspection and maintenance informa-
tion.
Screen/Strainer Replacement
1. Make sure the gas supply is turned off and all electrical
power has been removed.
2. Remove bolts/nuts from flange/valve.
3. Remove flange from gas supply pipe.
4. Remove old screen/strainer.
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3. If there is still no voltage at the valve leadwires or terminal
block, make sure all appropriate contacts in the thermostat
or controller, limits and flame safeguard control are closed. If
one or more are open, determine the cause(s); correct the
trouble and proceed.
4. If there is proper voltage at the valve but the valve still does
not open, check for normal gas pressure.
5. If the valve still does not open, replace the valve.
If the valve does not close when one or more of the appropriate
contacts in the thermostat, controller, limits or flame safeguard
control is open:
1. Make sure the valve is wired in the correct circuit.
2. Open the master switch to remove power from the valve.
3. If the valve closes now, check the wiring for the valve and cor-
rect the wiring as necessary.
4. Check for a short in the electrical circuit and repair it as ne-
cessary.
5. Clean the strainer by using compressed air, or replace the
strainer.
6. Install the cleaned strainer or new strainer.
7. Make sure O-ring sealing surface is clean on the flange.
8. Using general purpose lithium grease, grease the O-ring.
9. Apply a moderate amount of good quality pipe dope, resi-
stant to the action of LP gas, only on the pipe threads.
10. Install the O-ring in the O-ring groove provided on the flange/
valve body (one O-ring per groove).
11. Screw the flange onto the pipe.
12. Mount the gas valve to the flange, using the bolts and nuts for
each flange.
13. Apply power to the valve.
14. Turn on the main gas supply.
15. Complete the valve leak test.
16. Return the valve to service.
Manufactured for and on behalf of the
Environment and Combustion Controls
Division of Honeywell Technologies Sàrl,
Ecublens, Route du Bois 37, Switzerland
by its Authorised Representative.
EN0H-0281NL05-R1006
Subject to change without notice
© 2006 Automation & Control Solutions
Combustion Controls Europe