L.B. White 400 Tradesman Portable Forced Air - Manual (Page 17)

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The following explains a typical procedure to be
followed in checking gas pressures.
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The gas pressures will vary depending upon fuel type.
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Consult the dataplate on the heater or page 4 in this
manual for specific pressures to be used in conjunction
with this procedure.
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Gas pressure measured at the gas control valve will
verify proper inlet and burner manifold pressures.
A. Preparation
1. Obtain a pressure gauge capable of reading up to
minimum 10 PSIG.
2. Disconnect the heater from the electrical supply and
close the valve on the LP tank.
B. Gauge Installation
1. Remove the pressure tap plug on the gas regulator.
See Fig. 20.
FIG. 20
2. Install the gauge. See Fig.21. Reconnect the
electrical supply, open the fuel supply valve, and
start the heater
FIG. 21
C. Reading Pressures
1. With the heater operating, the pressure gauge must
read the pressures specified on the dataplate
2. Does the reading at the gas control valve agree with
that specified on the dataplate? If so, then no
further checking is required. Proceed to section D.
3. If the pressures do not agree with that specified on
the dataplate, then the regulator controlling gas
pressure to the heater requires adjustment or
replacment.
D. Completion
1. Once the proper pressure has been confirmed
and/or properly set, close the fuel supply 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.
3. Remove the gauge.
4. Install pressure tap plug and tighten securely
5. Open the fuel supply and start the heater. Check for
gas leaks at the plug Set heater’s thermostat to
desired temperature.
GAS PRESSURE CHECKS
16
PLUG