Gas Pressure Checks - L.B. White SENTINEL AT 150 Owner's Manual And Instructions

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The following is a typical procedure to be followed in
checking gas pressures for single or two stage gas
control valves
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Consult the dataplate on the heater or page 4 in this
manual for specific pressures. The gas pressures will
vary depending upon fuel type.
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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)
1 1/2 in. x 3 in. nipple
1 1/2 in. tee
1 Bushing, 1/2 in.x 1/8 in.
A. Preparation
1. Disconnect the heater from the electrical supply and
close the fuel supply valve to the heater inlet.
2. Remove the hose and hose adapter from the
sediment trap.
3. Install the nipple,tee, bushing, and a pressure gauge
as shown in Fig. 32. Install hose and hose adapter.
FIG. 32
BUSHING
TEE
NIPPLE
4. Open the burner box access panel.
5. Remove the plug from the connector near the power
cord and route the gauge tubing through the
connector. See Fig. 33. Keep the connector's plug.
GAUGE

Gas Pressure Checks

FIG. 33
CONNECTOR
PLUG
6. If connector is occupied by thermostat wiring, remove
the air inlet tube from the burner box and route gauge
tubing through burner box air inlet to gas control
valve. See Fig. 34.
FIG. 34
GAUGE TUBE
AIR INLET
7. Remove the pressure tap plug from the outlet of gas
control valve. Securely connect a pressure gauge.
See Fig.33.
8. Close and latch the burner box. Open the fuel supply
valves to the heater, reconnect the heater's electrical
supply, and start the heater.
C. Reading Pressures
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.
(Continued on page 22)
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