Gas Pressure Checks - L.B.White I-40 Manual De Usuario

6. Clean the heater's orifi ces with compressed
air or a soft, dry rag. Do not use fi les, drills,
broaches, etc. to clean the orifi ce holes. Doing
so will enlarge the hole, causing combustion or
ignition problems. Replace the orifi ce if it cannot
be cleaned properly.

Gas Pressure Checks

A. Preparation
1. Obtain a pressure gauge test kit part no. 500-
20736.
2. Close the fuel supply valve to the heater.
3. Brush or blow off any dust and dirt on or in the
vicinity of the gas control valve.
4. Disconnect the gas hose from the heater.
B. Gauge Installation
1. Connect the pressure test kit between the
heater and its gas supply hose as shown in Fig.
12. Ensure both gas shut-off valves
on the test kit are in the closed posi-
tion when connecting the kit to the
heater and gas supply.
2. Open the fuel supply valve to the heater.
3. Open only the gas shut-off on the test kit to
which the gas supply hose is connected.
4. Adjust the thermostatic head to its maximum
setting and light the heater.
C. Reading Pressures
1. With the heater operating at full heat output and
at minimum heat, the pressure gauge should
read the pressure specifi ed on the dataplate of
the zone panel.
2. Does the reading on the gauge of the test kit
agree with that specifi ed on the dataplate? If
so, then no further checking or adjustment is
required. Proceed to Section D.
I-40 Manual and Spark Ignition
3. If the pressure does not agree with that
specifi ed on the dataplate, then the regulator
controlling gas pressure to the heater requires
adjustment.
D. Completion
1. Once gas pressure has been confi rmed 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 hose.
2. If applicable, disconnect the heater from its
electrical supply.
2. Remove the gauge kit and reconnect the
heater's gas hose to the heater.
3. Reconnect the heater to its electrical supply, if
applicable.
4. Open the main fuel supply valves to the heater.
Light the heater.
Owner's Manual • I-40
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