|
WIRTZ MOLD COOLING SYSTEM (C.C.S.)
The reservoir should be filled with clean water from hose or faucet. There is a small float valve used to maintain water level during use.
The temperature in the tank is controlled by a heat exchanger. The temperature control valve (Wirtz part #6286) will let cooling water into the heat exchanger and cool the water in the reservoir to a preset temperature.
The tank has an electric pre-heater to eliminate cold starts. The electric heater control (Wirtz Part #6288) is calibrated in Fahrenheit degrees. This control should be set 10 degrees below the temperature that the tank is to be operated. Caution should be used in setting the operating temperature of the tank so the electric heater and heat exchanger, or cooling unit, are not fighting each other.
The best running temperature of the tank will depend on casting conditions. The warmer the cooling tank the less critical the adjustments will be on the flow control valves for the mold. The temperature of the tank could vary from 140°
F to 180°
F depending on the mold being cast
A light weight, .050, grid will run better with the mold coolant around 180°
F than at 140°
F. On the other hand, a heavy grid of .080 may over-heat with all the flow control valves open and the coolant tank set at 180°
F. The tank temperature then should be lowered to prevent over-heating and grid breakage.
The Penn Control Valve, (Wirtz part #6286) is an automatic temperature control for the cooling cycle of the tank. This control is preset at our factory between 140°
F and 180°
F operating temperature of the tank. If the control valve setting is to be changed, the casting machine and cooling tank should be running. The thermometer in the top of the tank must reach and remain at a constant temperature which is the set temperature of the Penn Control Valve. To increase this temperature, turn the screw adjustment on top of the Penn Water counter-clockwise. To decrease the tank temperature turn the same screw clockwise. The electric heater control should then be re-calibrated to 10°
below the tank temperature.
Ahead of the Penn Control Valve, a gate valve is provided. It may be necessary to restrict the flow of water through the heat exchanger to prevent the temperature of the tank from dropping too quickly.
|
