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Service
Adjust Pressure Switch
1. To obtain access to the pressure switch, the front panel must be removed. Remove the screws on either side of the
panel. Be sure to support the panel to avoid excessive strain on the wiring.
2. To increase the pressure setting turn the white ribbed knob clockwise; to decrease the pressure, turn it
counterclockwise. Use the centre of the black ring as an indicator.
3. With the kettle empty and completely cold, bypass the thermostat by moving the single terminal side wire to the
double terminal side connector on the thermostat. Turn kettle on.
4. Pressure in kettle (read pressure gauge on front panel) should reach a maximum of 35 psi and pressure relief valve
should not open. Kettle pressure may rise 3 or 4 psi even after burners shut down.
5. Relief valve should not open when kettle pressure is 40 psi; pressure switch setting is satisfactory.
6. If relief valve opens, reduce setting on pressure switch, cool kettle completely by running cold water through it and
repeat steps 3 - 6.
7. If pressure in kettle is below 30 psi when burners shut off, increase setting of pressure switch, cool kettle completely
by running cold water through it and repeat steps 3 - 7.
8. When adjustment is complete, move wire from shorted terminal on the thermostat back to the appropriate terminal
and replace the front panel.
Adding Water
It may be necessary to replenish water in the jacket when the low water indicator comes on. Do so as follows:
1. Unit should be completely cold and off.
2. Total amount of distilled water contained in jacket is 6 gallons, 110 ounces. Amount of water to be added in a low
water condition is 236 fluid ounces (7 litres).
3. Lift handle of pressure relief valve to release vacuum in kettle. (Relief valve is at left rear of kettle.)
4. Remove air vent nut on the elbow located at the rear left of the unit.
5. Using pure distilled water only, pour the water into the opening. (A funnel will be helpful.) Water will enter the kettle
slowly, as air must escape through the same hole. Water should be added until water level at the sight glass is half
way between the minimum and maximum levels.
6. When sufficient water has been added, replace and tighten the nut. Be sure to seal threads with a pipe joint
compound suitable for steam at 50 psi.
7. Vacuum must be re-established. (See Re-establishing Vacuum.)
Re-Establishing Vacuum
With the kettle completely cold a vacuum of 25 to 30 inches mercury column (M.C.) 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.
18
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INSTALLATION & OPERATION MANUAL 10156 REV 3 (08/22)
Gas Kettle
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