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SERVICE
WARNING: THE KETTLE AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING, CLEANING
AND SERVICING THE KETTLE.
WARNING: DISCONNECT ELECTRICAL POWER SUPPLY AND PLACE A TAG AT THE
DISCONNECT SWITCH TO INDICATE THAT YOU ARE WORKING ON THE CIRCUIT.
GENERAL NOTES
The signal light marked "Power On" glows when the On-Off switch is turned to ON, and electric power
is supplied to the kettle.
The signal light marked "Heat On" glows when the thermostat switch is closed (thermostat calling for
heat).
The thermostat, with the dial at the highest setting, should cut the power off at a jacket pressure of
12 to 13 p.s.i. and before the pressure relief valve opens.
The pressure limit switch is set to open when the jacket pressure reaches 15 p.s.i. and to close when
jacket pressure drops to 6 p.s.i.
The On-Off switch is a two-pole switch and opens both lines of the control circuit. The thermostat
switch, the low water cut-off switch and the pressure limit switch are single-pole switches.
SERVICING PROCEDURES
WARNING: DISCONNECT ELECTRICAL POWER SUPPLY AND PLACE A TAG AT THE
DISCONNECT SWITCH TO INDICATE THAT YOU ARE WORKING ON THE CIRCUIT.
Thermostat
To recalibrate, remove the dial by pulling it forward, and slightly turn the small screw in the center of
the hollow dial shaft. Recalibration is indicated if the thermostat, with the dial at the highest setting,
fails to shut the power off before the pressure relief valve opens, or if it shuts the heating elements off
before the jacket pressure reaches 13 p.s.i.
To replace the thermostat, remove two screws under the dial, disconnect the wire leads, unscrew the
packing gland around the capillary tube where it enters the jacket, unscrew the bushing the gland was
threaded into, and pull the bulb from the jacket.
When installing the new thermostat, insert the bulb first. Be careful that the capillary tube is not bent
sharply, that the packing gland seal is pressure tight, that the wire leads are clean and terminal screws
are tight, and that the capillary tube is positioned so there is good clearance (
3
/4" minimum) between
it and any uninsulated electrically live part.