Table of Contents
Advertisement
Service
Pressure Switch
The pressure switch should not be adjusted until it is determined to be the cause of an operating pressure difficulty. See
"Thermostat" section to determine if the source of difficulty is the pressure switch or thermostat.
The major difficulties caused by pressure switch mis-adjustment are:
1. Pressure relief valve opening, pressure rises above 45 psi.
2. Pressure in kettle is less than 30 psi and burner is being shut down by pressure switch (not thermostat).
The pressure switch is preset for proper operation from the factory. It is adjusted to the maximum pressure which will prevent
the pressure relief valve from opening. During preheat to the maximum thermostat setting (275°F), from either a cold condition
or a lower temperature setting, the temperature may overshoot the thermostat setting and be shut down by the pressure switch.
This is normal, however, after the kettle has cycled several times (empty) the thermostat will begin cycling the unit.
To Adjust Pressure Switch
1. To obtain access to the pressure switch, the front panel must be removed. Remove the screws on bottom of the
panel. Be sure to support the panel to avoid excessive strain on the wiring.
2. To increase the pressure switch setting, turn the white ribbed knob clockwise; to decrease, turn it counterclockwise.
Use the centre of the black ring as an indicator.
3. With the kettle empty and completely cold, turn kettle on and set thermostat to maximum setting (275°F).
4. The pressure in kettle (read pressure gauge on front panel) should reach a maximum of 30 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 45 psi; pressure switch setting is satisfactory.
6. If the safety 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 increase setting of pressure switch, cool kettle completely by running cold water
through it and repeat steps 3 - 7.
8. Allow the kettle to cycle several times to verify the correct pressure setting.
9. Replace the front panel when adjustment is complete.
Adding Water (Low Water Light Comes On)
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. Lift handle of pressure relief valve to release vacuum in kettle. (Relief valve is at right rear of kettle.)
3. Remove air vent nut on the tee located next to the relief valve.
4. 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.
5. 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.
6. Vacuum must be re-established (See Re-establishing Vacuum).
FOR REFERENCE:
The total amount of distilled water to be added when low level pilot is illuminated:
16
PAGE
OF 32
MODEL
GLT - 20
GLT - 30 & GLT - 40
GLT - 60
INSTALLATION & OPERATION MANUAL 10070 REV 0 (04/21)
Gas Fired Steam Tilting Kettles
AMOUNT
169 fl. oz. (5 L)
270 fl. oz. (8 L)
372 fl. oz. (11 L)
Advertisement
Table of Contents
