Lincoln Electric IM723-A - Manual (Page 13)

B-1 OPERATION
UNDER-COOLER CART
B-1
SAFETY PRECAUTIONS 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.
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.
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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WARNING
CAUTION