Crown GL-40FE Installation & Operation Manual page 20

Gas kettles
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Service
Re-Establishing Vacuum
With the kettle completely cold a vacuum of 25 - 30 in. Hg or 635 - 762 mm Hg should be maintained as indicated in the
green zone on the pressure gauge on the front control panel. If at any time the vacuum is not in the green zone, vacuum
should be re-established.
With the kettle empty, turn the thermostat knob to the highest temperature. When the temperature pilot light goes off, open
air vent nut one (1) full turn for 20 seconds and then close and tighten the nut. This should remove the air and any loss in
performance should return.
Should the kettle fail to maintain a vacuum after repeated attempts to establish it, further checks should be made to see
if the pressure relief valve is leaking or if there are any leaks in the pressure relief valve piping, copper lines going to the
pressure switch, pressure gauge or thermostat fitting.
Control Circuit Fuses
The control circuit is protected by a 3 amp. fuse which is located inside control panel, top right side above transformer.
Should the unit fail to turn on, check this fuse by removing it and either replacing it or testing it with a continuity tester. If
the fuse is good, check the main power circuit breaker, which should be external to the kettle.
Converting Between Natural and Propane Gas
Fire or explosion hazard can cause property damage,
severe injury, or death.
1. Do not attempt to use a gas control set for natural
gas on propane gas or gas control set for LP gas
on natural gas.
2. When making conversion, main and pilot burner
orifices MUST be changed to meet appliance
manufacturer's specifications.
To convert control from one gas to another:
1. Turn off main gas supply to the appliance.
2. Remove the regulator cap screw and pressure regulator
adjusting screw. See Figure 3.
3. Remove the existing spring.
4. Insert the replacement spring with tapered end down.
See Figure 4.
5. Install the new plastic pressure regulator
adjustment screw so that the top of the screw is
flush (level) with the top of the regulator. Turn the
pressure regulator adjustment screw clockwise
six complete turns. This provides a preliminary
pressure setting of about 10.0 inch W.C. (2.5 kPa)
for LP regulator and 4.0 inch W.C. (1.0 kPa) for
natural gas regulator.
6. Check the regulator setting either with a manometer or
by clocking the gas meter.
7. Install the new cap screw.
8. Mount conversion label on control.
9. Install control and appliance according to appliance
manufacturer's instructions.
20
PAGE
OF 32
WARNING
INSTALLATION & OPERATION MANUAL 10199 REV 3 (08/22)
Figure 3
Top view of gas control
Figure 4
Installation of conversion kit in regulated gas control.
Gas Kettles

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