L.B. White Pilot Light Ignition Installation And Service Manual page 74

Servicing
Instructions
Leak and Gas Pressure Checks
D. Reading P P ressures
1. With the heater operating, the pressure gauges
should read the pressures specified on the dataplate,
or in the specification section of this guide.
2. Do the readings at the inlet and outlet pressure
gauges agree with that specified on the dataplate? If
so, then no further checking or adjustment is
required. Proceed to Section F.
3. If the inlet pressures do not agree with that specified
on the dataplate, then the building system regulator
controlling gas pressure to the heaters requires
adjustment.
4. If the inlet pressures are correct but the burner
manifold pressure does not agree with that specified
on the dataplate, then the gas control valve's internal
pressure regulator requires adjustment. Proceed to
Section E.
E. Burner M M anifold P P ressure A A djustment
Refer to the following instructions, after proper inlet pressure
has been established.
1. Light the heater. Once the heater has lit, observe at
the manifold (outlet) pressure gauge. Burner manifold
pressure must be the same pressure as given on the
dataplate.
2. If the manifold pressure does not correspond to the
manifold pressure given on the dataplate, the outlet
pressure must be adjusted at the valve by following
these instructions.
accomplished with the burner on.)
a. Remove the regulator cap on the control valve to
expose the output pressure adjusting screw.
(Valve shown outside of heater for clarity of viewing.)
8.9-3 3
(This procedure must be
Regulator
Cap
b. Using a standard screwdriver, turn the plastic
adjusting screw until the gauge reads proper
manifold pressure.
pressure. Counterclockwise will decrease
pressure.
c. Reinstall regulator cap on valve.
NOTE:
Procedures for adjusting outlet pressure on control valves
used on earlier models are the same. However, the internal
regulator on the valve is at a slightly different location.
3. Close the fuel valves and disconnect the electrical
supply to the heater.
4. Remove gauges and adapters and reinstall the
pressure tap plugs, tightening both securely.
5. Open the fuel supply valves and reconnect heater to
electrical supply. Test heater for proper operation.
F. Completion
1. Once inlet and burner manifold pressures have been
confirmed and/or properly set, close the fuel supply
valve to the heater and allow the heater to burn off any
as remaining in the gas supply line.
2. Disconnect the heater from its electrical supply.
3. Remove the gauges and connecting hoses.
4. Reinstall the pressure tap plugs and tighten securely.
Check for gas leaks to insure the tap screws have
seated properly.
Clockwise increases outlet
August 1999