Water at positive pressure will leak out of mold cracks or bad o-rings. During negative pressure operation, however, air is drawn through the lines, and the mold operates without leaking. A manual three-way ball valve can be closed to make these units into standard direct injection units. Because the units use water and vent to the atmosphere, they have a maximum process temperature of 180° F.

vacuTrac Control (TW-1) 
Our waterproof, durable control is operator friendly and smart. Standard features: 

• Automatic fine-tuning of PID control parameters provides uniform temperature control regardless of external loading. 
• Adjustable high/low deviation warnings track with your setpoint temperature. Preprogrammed acceleration feature speeds up setting parameters. 
• 18 operating and fault indicator lights, including 7 bi-color LEDs, tell you the status of critical components and parameters. 
• Password entry prevents unauthorized or accidental changes to operating parameters. 
• RS485 communication using SPI protocol. Baud rates and addresses are programmable on the operator panel.

vacuTrac Plus Control (TW-2) 
Includes all of the features of the standard vacuTrac control, PLUS: 

• Autostart capability for convenient preheating of molds.Works with external timers or switches. 
• Choice of temperature control points allows you to monitor and control from the process supply or process return temperature, or from an average of the two. 
• Phase detection circuit indicates incorrect pump rotation or an open electrical leg. 
• Remote control up to 50 feet. Magnetic panel back allows you to place the controls where you need them. Comes with 15-foot cable. Lengths of 30 or 50 feet optional. Note: The purge option is not available on the vacuTrac positive/negative pressure water temperature controllers.