L.B. White I-40 Infraconic Spark Ignition - Manual (Page 18)

FUEL SUPPLY VALVE
(OPEN THIS VALVE TO USE
PRESSURE GAUGE)
TEST KIT HOSE
PRESSURE GAUGE KIT
20736
GAS CONTROL VALVE
OPEN
17
FIG. 23
GAS PRESSURE CHECKS
A. Preparation
1. Obtain a pressure gauge test kit - part No. 20736.
2. Disconnect the heater from the electrical supply and
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
gas supply hose. See Fig. 23. Insure both gas shut-off
valves on the test kit are in the closed position when
connecting the kit to the heater and gas supply.
2. Reconnect the heater to its electrical supply and open
the main fuel supply valve to the heater.
3. Open only the gas shut-off on the test kit which is
connected to gas supply.
4. Light the heater.
C. Reading Pressures
1. With the heater operating, the pressure gauge should
read the pressure specified on the dataplate.
2. Does the reading on the gauge of the test kit agree
with that specified on the dataplate? If so, then no
further checking or adjustment is required. Proceed to
Section D.
3. If the pressure does not agree with that specified on
the dataplate, then the regulator controlling gas
pressure to the heaters requires adjustment.
D. Completion
1. Once gas pressure has 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 hose.
2. Disconnect the heater from its electrical supply.
3. Remove the gauge kit and reconnect the gas hose and
electrical supply to the heater. Tighten securely.
4. Open the fuel supply valves and set building controller
to desired temperature.
GAS CONTROL VALVE
1. Loosen the water tight connector nut at the control
box securing the control valve’s wiring.
2. Remove the control box cover and disconnect the
valve’s wiring from the ignition control.
3. Route the valve’s wiring through the connector and
remove the valve ground and attachment screw at the
air housing.
4. Remove the hose adapter from control valve inlet.
5. Remove the gas control valve from the heater.
When reassembling:.
-- Apply Loctite (supplied with replacement valve)
to first four threads of air housing.
-- Thread the gas control valve onto the air
housing at least four full turns, and as needed to
allow the valve to be installed upright.
FIG. 22
GAS SUPPLY HOSE
LOOSEN
CONNECTOR
AIR HOUSING
REMOVE
SCREW