Functioning Mode - Crown EL-25 Installation & Operation Manual

INSTALLATION AND OPERATION MANUAL,
SELF GENERATING STEAM JACKETED KETTLES, MODELS EL AND EP

5.0 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.
Part No. 10068R6 9 2018-06-21