Lang MM24, Installation Operation & Maintenance

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OPERATION CONT’D
OPERATING Do’s and Don’ts
DO:
Insure all dishes placed in the cheese-melter are oven safe.
Pre-heat pans in the cheese-melter or on a stove.
Turn products halfway through cooking, as needed.
Use the unit in Automatic as much as possible, use Constant during peak periods.
DON'T:
Do not use the cheese-melter as a cooking or baking device, it is best suited for
finishing dishes immediately prior to serving.
Do not use the unit to heat or thaw chilled or frozen product.
Do not place aluminum foil on the rack or bottom shelf. This will reflect heat and
expose components to unnecessary high temperatures.
Do not move rack from one position to another without hand protection.
TYPICAL OPERATION
AUTOMATIC MODE
When the mode select switch is placed in "AUTOMATIC" and the power switch
is moved to the "ON" position, power is applied to all of the elements.
The power switch energizes a contactor that connects the elements to the
incoming power leads. Because the elements are connected in series, all
elements have power applied. With all elements connected in the circuit, the rear
element appears dimly lighted and the front elements appear not energized.
In the "AUTOMATIC" mode, the elements are activated to provide full heat only
when product is placed on the rack. Placing product on the rack causes the shelf
to tilt down, activating a micro switch via the sliding actuator connected to the
right front corner of the rack.
Closing the micro switch energizes a 2-pole heating contactor causing both sets
of contactor points to close. One set of contactor points is connected in parallel
with the rear element. This connection, when activated, changes the circuit
resistance/electrical configuration.
Electrically this presents an alternate current path by shorting across the rear
element. The effect is that the front and middle elements energize, while
appearing to de-energize the rear element. Front and middle elements now have
voltage applied for their rated operating level. For 208-volt and 240-volt units,
the voltage to these elements is 104 and 120-volts, respectively.
CONTINUOUS MODE
In this mode of operation, the heat contactor is energized at all times. Movement
of the rack does not energize or de-energize the elements. The rear element does
not light or heat at any time. The front and middle elements are energized at all
times.