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Introduction, Capacities & Functioning Mode
Self-Generating Steam Jacketed Kettles
Introduction
Description
All electrically powered kettles described and referred to in this manual are pressure vessels of a double-wall construction
forming a sealed jacket (chamber) enveloping the lower two thirds of the kettle bowl surface.
The kettle bowl is the container for the food product which ideally should be a liquid or semi-liquid consistency to achieve complete
contact with the bowl surface and thus fully absorb the heat transmitted through that surface from the pressurized steam generated
in the kettle jacket.
The jacket is intended to function as a self contained sealed chamber with a permanent solution of water and antifreeze sufficient not only to
immerse and thereby protect replaceable electric heating elements, but also provide the steam source during the steam generating process.
The heating elements are thermostatically dial controlled to provide precise temperatures throughout the range from slow
simmer to rolling boil.
All stationary kettles are intended to be permanently floor mounted on legs with adjustable flanged feet (EL models) or
pedestals (EP models).
All kettles are equipped with a hinged counterbalanced stainless steel lid covering the kettle bowl opening, a sanitary stainless steel
tangent draw-off valve for the removal of the food product from the kettle bowl, and a safety relief valve plumbed to the kettle jacket.
Capacities
All models are suffixed with either - 20, - 25, - 30, - 40, - 60, - 80 or -100 to indicate the capacity of that kettle in US gallons. Thus
an EL-40 indicates a two thirds jacketed electrically powered steam kettle mounted on legs with a capacity of 40 US gallons.
Functioning Mode
All electrically powered self steam generating kettles consist of a jacket charged with a solution of water and antifreeze sufficient to
completely immerse and protect replaceable electric heating elements.
To minimize tampering, the Safety Valve is plumbed toward the rear of the kettle jacket. Should any component malfunction and
cause the pressure in the jacket to reach the rated pressure of the kettle, this protective device will open automatically and release
excessive pressurized steam.
When the Power Switch is turned ON and the Temperature Control (Thermostat) Knob dialed simultaneously, TEMPERATURE pilot light will
come on and contactors will close to allow power to elements. Steam generation will commence and continue until the water contained in the
jacket reaches the thermostatic temperature, manually preselected, at which point the Temperature (thermostat) Control will de-energize and
open the contactors cutting off power to heating elements and TEMPERATURE pilot light will go off. When the temperature of the water in
the jacket drops slightly, the cycle will repeat itself thus making it possible to maintain any selected precise cooking mode temperature.
The temperature required for the cooking process to function adequately must be greater than the boiling point of the liquid food
product. Further, the higher the temperature, the greater the steam pressure attained in the jacket and consequently the quicker
the cooking process. For example, steam pressurized at 30 p.s.i. attains a temperature of 274º Fahrenheit.
Since air is an unsuitable media through which heat may be transferred, it has been removed from the kettle jacket during
testing at factory. The Pressure Gauge should indicate vacuum in the jacket, in the green vacuum zone on the gauge
(approximately 25 - 30 inches Hg), when the kettle is cold or has been inoperative for some time. The kettle jacket is intended
to function at all times as a completely sealed self-contained chamber and it is especially advisable not to trip the safety relief
valve during inoperative periods since this will break the vacuum seal and allow air to enter the kettle jacket.
It should be noted that Temperature Controls (thermostats) used on these particular kettles have an ultimate high limit temperature
and this setting will prevent the heating elements from ever generating steam pressure to reach or exceed the rated working
pressure of these kettles. Further should the Temperature Control fail, an unlikely condition, and consequently the circuit to the
heating elements remain energized, the Safety Valve will blow and release steam (i.e., water) from the self contained sealed kettle
jacket and consequently lower the water level in the jacket. A Safety Probe is incorporated in the circuit to sense depletion of the
water level in the kettle jacket and will not only activate the LOW WATER level indicator pilot light but also signal the Liquid Level
Control to switch off power and de-energize the circuit to the heating elements (preventing element burn outs) until the water level
is adequately replenished.
8
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OF 28
INSTALLATION & OPERATION MANUAL 10068 REV 7 (05/21)
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