Schreiber Chillers MC75AC - Manual (Page 5)

MC75 - AC
TRUE MOLD CONTROL, WITH A NARROW BAND
DESCRIPTION OF IT’S OPERATION
1 THE TRUE MOLD CONTROL is designed as a source of high temperature water for
controlling the temperature of molding equipment. This system has a stainless steel water
reservoir, which is controlled by a narrow band controller that holds the water reservoir to a
close temperature tolerance.
i) There is an electric heater installed in the water reservoir tank, which provides the
heating. The cooling is done by an air-cooled condenser and ambient air is the
cooling source for controlling the water temperature. The fan motor that distributes
air over the condenser is also controlled by a thermocouple sensing the return water
temperature. The temperature of the water is controlled by a thermocouple wire
from the controller.
ii) The main components of the mold control are: stainless steel water reservoir; water
pump; heater element; fan motor; fan blade; cooling condenser; Narrow Brand Solid
State Controller.
2 Control System: All functions of unit are controlled by a solid-state narrow band controller*.
The water pump motor can be started with a switch on the controller. When the water pump
is running the temperature of the discharge water will displayed on the controller. The return
water has its own temperature display. When the return water is 2
0
F above the set point
the cooler supply water will open allow chilled water to flow through the chilled water heat
exchanger. This will cool the water to the mold to the proper temperature.
i) The unit has a high temperature cut-out. If the water temperature goes over 250
0
F, the controller will cut out the heating element.
ii) There is a low water float installed in the reservoir. If the water reaches a low
level, the float will cut the system out till the reservoir is filled to proper level.
*There is a rotary off & on switch, which controls the Electrical power to the
unit.
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