SAFETY PRECAUTIONS
WARNING
ELECTRIC SHOCK can kill.
•Disconnect input power by remov- ing plug from receptacle before working inside Cooler.
•Do not operate with covers removed.
•Use only grounded receptacle.
•Do not remove the power cord ground prong.
•Do not touch electrically “hot” parts inside Cooler.
•Have qualified personnel do the installation, maintenance and troubleshooting work.
•Never operate the cooler with the cooler drawer opened except to temporarily check coolant flow in the reservoir.
•Unplug the cooler before performing general maintenance without removing drawer.
•High voltage typical of welding operations can kill.
•Immersion in water around electrical lines can cause electrical shock.
•Moving parts can injure. Never place fingers into openings of Cooler.
•Unplug the cooler and remove water hoses to remove drawer from the cabinet for mainte- nance purposes. A jumper hose between the coolant in and out connections should be installed to avoid excessive loss of coolant in the system.
•Never operate the cooler with the reservoir fill cap off.
•Hot coolant can burn skin. Always be sure coolant is NOT HOT before servicing the cooler.
•Do not pour used ethylene glycol coolant down the drain.
•Do not remove the pump relief valve's 3/4" hex nut or attempt to adjust the relief valve setting.
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See additional warning information at front of this operator’s manual.
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GENERAL DESCRIPTION
The Under-Cooler cart is an internal type, re-circula- tion cooling system designed for use with water- cooled TIG torches. The coolant "IN" and "OUT" con- nections are 5/8-18 left-hand female threads which match the standard connector nut of domestic water hoses (CGA style) and water-cooled TIG torches. The Under-Cooler cart can either run with the "cooler as needed" circuit, which operates in conjunction with the TIG machine fan, or continuously, powered on and off with the TIG machine power switch.
The overall size and shape of the Under-Cooler cart is designed for mounting the Precision TIG 275 / 375 machine on top. The Under-Cooler cart plugs into a 115 V power receptacle in the rear of the machine and is rated for both 50 or 60 HZ. Adding coolant to the reservoir is simple and connecting to the coolant "IN" and "OUT" connections are easily made with an adjustable wrench.
The Under-Cooler cart coolant flow is circulated through a heat exchanger to remove heat energy from the coolant. The coolant flow is then deposited into the coolant reservoir. The pump draws its coolant sup- ply from the coolant reservoir and delivers coolant to the welding torch. Refer to Flow Diagram Section F.
CAUTION
DO NOT USE A WATER SOLENOID VALVE with the Under-Cooler Cart.
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RECOMMENDED PROCESSES
The Under-Cooler Cart is designed for use with the Precision TIG 275 and Precision TIG 375 machines. The recommended 115 V power receptacle is labeled "cooler as needed". This receptacle shuts on and off in conjunction with the TIG machine fan. By using this receptacle, the duty cycle of the cooler is greatly reduced and lets the cooler run only when needed.
RECOMMENDED EQUIPMENT
The Under-Cooler cart is designed for use with the Precision TIG 275 and Precision TIG 375 and any water cooled TIG Torches applicable. Although the cooler could operate as a standalone unit, the cart has been designed specifically to mount these two TIG machines only.
