L.B. White 350 Premier Dual Fuel - Manual (Page 21)

ATTENTION
■ The following explains a typical procedure to be followed
in checking gas pressures.
■ The gas pressures will vary depending upon fuel type.
■ Consult the dataplate on the heater or page 4 in this
manual for specific pressures to be used in conjunction
with this procedure.
■ Gas pressure measured at the inlet to the gas valve is
Inlet Pressure and gas pressure measured at the outlet
of the gas valve is Burner Manifold Pressure.
MATERIALS REQUIRED
Quantity Description
2 Gas pressure gauges capable of reading
up to 35 in. W.C. (may also be ordered
from L.B. White, part number 00764)
A. PPreparation
1. Disconnect the heater from the electrical supply and
close the fuel supply valve to the heater.
2. Open the case access panel at burner end of heater.
3. Brush or blow off any dust or dirt in the vicinity of the
gas control valve.
B. G Gauge IInstallation
1. Locate the gas control pressure taps, see Fig. 31.
Remove the pressure tap plugs using a 3/16 in. allen
key.
2. Securely connect pressure gauges at these points.
3. Open the fuel supply valves to the heater and
reconnect the heater electrical supply.
4. Start the heater
C. R Reading PPressures
1. With the heater operating, the pressure gauges
should read the pressures specified on the dataplate.
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 D.
3. If the inlet pressures do not agree with that specified
on the dataplate, then the regulator controlling gas
pressure to the heater requires adjustment.
4. If the inlet pressure is correct but the burner manifold
pressure does not agree with that specified on the
dataplate, then the gas control valve’s internal
pressure regulator needs adjsutment:
-- Remove the regulator cap on the control valve.
-- Using a standard screwdriver turn the adjusting
screw clockwise (to increase pressure) or counter-
clockwise (to decrease pressure) until the burner
manifold pressure is set.
-- Install regulator cap.
D. C Completion
1. Once the proper 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 gas remaining in the gas supply line.
2. Disconnect the heater from its electrical supply and
close fuel supply valve.
3. Remove the gauges.
4. Install pressure tap plugs.
5. Open fuel supply valve and reconnect electrical
supply to heater. Start the heater and check for gas
leaks.
6. Set thermostat to desired temperature.
FIG. 31
Gas Pressure Checks
WARNING
■ Do not disassemble the gas control valve.
■ Do not attempt to replace any components of the gas
control valve.
■ The gas control valve must be replaced if any physical
damage occurs to the control valve assembly.
■ Failure to follow this warning will result in fire or
explosions, leading to injury or death to humans, and
property damage.
OUTLET PRESSURE TAP INLET PRESSURE T
INTERNAL PRESSURE REGULATOR
GAUGE AT VALVE INLET GAUGE AT VALVE INLET OUTLET
TAP
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