INSTRUCTION MANUAL
Heliarc 350 AC/DC
WELDING POWER SOURCE
F-14-447-A
April, 1995
This manual provides installation and operation instructions for the following Heliarc 350 AC/DC power sources:
ESAB P/N 35588 - 208/230/460 V ac, 1 phase, 60 Hz with power factor
ESAB P/N 35534 - 230/460/575 V ac, 1 phase, 60 Hz with power factor (refer to supplement F-14-453)
ESAB P/N 35597 - 220/380/415 V ac, 1 phase, 50 Hz with power factor (refer to supplement F-14-454)
L-TEC P/N 35600 - 220/380/415 V ac, 1 phase, 50 Hz with power factor (refer to supplement F-14-454)
ESAB P/N 35585 - 208/230/460 V ac, 1 phase, 60 Hz without power factor
ESAB P/N 35591 - 230/460/575 V ac, 1 phase, 60 Hz without power factor (refer to supplement F-14-453)
This manual is also suitable for use with L-TEC Heliarc 306 as made prior to April, 1995.
These INSTRUCTIONS are for experienced operators. If you are not fully familiar with the principles of operation and
safe practices for electric welding equipment, we urge you to read our booklet, "Precautions and Safe Practices for Arc
Welding, Cutting, and Gouging," Form 52-529. Do NOT permit untrained persons to install, operate, or maintain this
equipment. Do NOT attempt to install or operate this equipment until you have read and fully understand these
instructions. If you do not fully understand these instructions, contact your supplier for further information. Be sure
to read the Safety Precautions before installing or operating this equipment.
Be sure this information reaches the operator.
You can get extra copies through your supplier.
ESAB Welding &
Cutting Products
USER RESPONSIBILITY
This equipment will perform in conformity with the description thereof contained in this manual and accompanying
labels and/or inserts when installed, operated, maintained and repaired in accordance with the instructions
provided. This equipment must be checked periodically. Defective equipment should not be used. Parts that are
broken, missing, worn, distorted or contaminated should be replaced immediately. Should such repair or replacement become necessary, the manufacturer recommends that a telephone or written request for service advice be
made to the Authorized Distributor from whom purchased.
This equipment or any of its parts should not be altered without the prior written approval of the manufacturer.
The user of this equipment shall have the sole responsibility for any malfunction which results from improper use,
faulty maintenance, damage, improper repair or alteration by anyone other than the manufacturer or a service
facility designated by the manufacturer.
2
SAFETY PRECAUTIONS
WARNING: These Safety Precautions are for
your protection. They summarize precautionary information from the references listed in
Additional Safety Information section. Before
performing any installation or operating procedures, be sure
to read and follow the safety precautions listed below as well
as all other manuals, material safety data sheets, labels, etc.
Failure to observe Safety Precautions can result in injury or
death.
PROTECT YOURSELF AND OTHERS
Some welding, cutting, and gouging
-
processes are noisy and require ear
protection. The arc, like the sun, emits
ultraviolet (UV) and other radiation
and can injure skin and eyes. Hot metal can cause
burns. Training in the proper use of the processes and
equipment is essential to prevent accidents. Therefore:
1. Always wear safety glasses with side shields in any work
area, even if welding helmets, face shields, and goggles
are also required.
2. Use a face shield fitted with the correct filter and cover
plates to protect your eyes, face, neck, and ears from
sparks and rays of the arc when operating or observing
operations. WARN bystanders not to watch the arc and
not to expose themselves to the rays of the electric-arc
or hot metal.
3. Wear flameproof gauntlet type gloves, heavy long-sleeve
shirt, cuffless trousers, high-topped shoes, and a welding
helmet or cap for hair protection, to protect against arc
rays and hot sparks or hot metal. A flameproof apron may
also be desirable as protection against radiated heat and
sparks.
4. Hot sparks or metal can lodge in rolled up sleeves,
trouser cuffs, or pockets. Sleeves and collars should be
kept buttoned, and open pockets eliminated from the
front of clothing
5. Protect other personnel from arc rays and hot sparks with
a suitable non-flammable partition or curtains.
6. Use goggles over safety glasses when chipping slag or
grinding. Chipped slag may be hot and can fly far.
Bystanders should also wear goggles over safety glasses.
FIRES AND EXPLOSIONS -- Heat from
flames and arcs can start fires. Hot
slag or sparks can also cause fires and
explosions. Therefore:
1. Remove all combustible materials well away from the
work area or cover the materials with a protective nonflammable covering. Combustible materials include wood,
cloth, sawdust, liquid and gas fuels, solvents, paints and
coatings, paper, etc.
2. Hot sparks or hot metal can fall through cracks or
crevices in floors or wall openings and cause a hidden
smoldering fire or fires on the floor below. Make certain
that such openings are protected from hot sparks and
metal.“
3. Do not weld, cut or perform other hot work until the
workpiece has been completely cleaned so that there are
no substances on the workpiece which might produce
flammable or toxic vapors. Do not do hot work on closed
containers. They may explode.
4. Have fire extinguishing equipment handy for instant use,
such as a garden hose, water pail, sand bucket, or
portable fire extinguisher. Be sure you are trained in its
use.
5. Do not use equipment beyond its ratings. For example,
overloaded welding cable can overheat and create a fire
hazard.
6. After completing operations, inspect the work area to
-
make certain there are no hot sparks or hot metal which
could cause a later fire. Use fire watchers when necessary.
7. For additional information, refer to NFPA Standard 51B,
"Fire Prevention in Use of Cutting and
Welding Processes", available from the
National Fire Protection Association,
Batterymarch Park, Quincy, MA 02269.
ELECTRICAL SHOCK -- Contact can
cause severe injury or death. DO NOT use AC output in
damp areas, if movement is confined, or if danger of
falling exists. Put on dry, hole-free gloves before turning on the power. Also:
1. Be sure the power source frame (chassis) is connected
to the ground system of the input power.
2. Connect the workpiece to a good electrical ground.
3. Connect the work cable to the workpiece. A poor or
missing connection can expose the operator or others to
a fatal shock.
4. Use well-maintained equipment. Replace worn or dam-
aged cables.
5. Keep everything dry, including clothing, work area, cables,
torch/electrode holder and power source. Fix water leaks
immediately.
6. Make sure that you are well insulated, especially when
standing on metal or working in tight quarters or in a damp
area. Wear rubber-soled shoes and stand on a dry board
or insulating platform.
7. Turn off the power before removing your gloves.
8. Refer to ANSI/ASC Standard
Z49.1 (see listing below) for specific
grounding recommendations. Do not
mistake the work lead for a ground
cable.
ELECTRIC AND MAGNETIC FIELDS — May be dangerous. Electric current flowing through any conductor
causes localized Electric and Magnetic Fields (EMF).
Welding and cutting current creates EMF around welding cables and welding machines. Therefore:
1. Welders having pacemakers should consult their physi-
cian before welding. EMF may interfere with some pacemakers.
2. Exposure to EMF may have other health effects which
are unknown.
3. Welders should use the following procedures to minimize
exposure to EMF:
3
A. Route the electrode and work cables together. Secure
them with tape when possible.
B. Never coil the torch or work cable around your body.
C. Do not place your body between the torch and work
cables. Route cables on the same side of your body.
D. Connect the work cable to the workpiece as close as
possible to the area being welded.
E. Keep welding power source and cables as far away
from your body as possible.
FUMES AND GASES -- Fumes and
gases, can cause discomfort or harm,
particularly in confined spaces. Do
not breathe fumes and gases. Shielding gases can cause asphyxiation.
Therefore:
1. Always provide adequate ventilation in the work area by
natural or mechanical means. Do not weld, cut, or gouge
on materials such as galvanized steel, stainless steel,
copper, zinc, lead, beryllium, or cadmium unless positive
mechanical ventilation is provided. Do not breathe fumes
from these materials.
2. Do not operate near degreasing and spraying operations. The heat or arc rays can react with chlorinated
hydrocarbon vapors to form phosgene, a highly toxic
gas, and other irritant gases.
3. If you develop momentary eye, nose, or throat irritation
while operating, this is an indication that ventilation is not
adequate. Stop work and take necessary steps to improve ventilation in the work area. Do not continue to
operate if physical discomfort persists.
4. Refer to ANSI/ASC Standard Z49.1 (see listing below) for
specific ventilation recommendations.
CYLINDER HANDLING -- Cylinders, if
mishandled, can rupture and violently
release gas. Sudden rupture of cylinder, valve, or relief device can injure or
kill. Therefore:
1. Use the proper gas for the process and use the proper
pressure reducing regulator designed to operate from
the compressed gas cylinder. Do not use adaptors.
Maintain hoses and fittings in good condition. Follow
manufacturer's operating instructions for mounting regulator to a compressed gas cylinder.
2. Always secure cylinders in an upright position by chain or
strap to suitable hand trucks, undercarriages, benches,
walls, post, or racks. Never secure cylinders to work
tables or fixtures where they may become part of an
electrical circuit.
3. When not in use, keep cylinder valves closed. Have valve
protection cap in place if regulator is not connected.
Secure and move cylinders by using suitable
hand trucks. Avoid rough handling of cylinders.
4. Locate cylinders away from heat, sparks,
and flames. Never strike an arc on a cylinder.
5. For additional information, refer to CGA
Standard P-1, "Precautions for Safe Handling of Compressed Gases in Cylinders", which is available from
Compressed Gas Association, 1235 Jefferson Davis
Highway, Arlington, VA 22202.
EQUIPMENT MAINTENANCE -- Faulty or
improperly maintained equipment can cause
injury or death. Therefore:
4
1. Always have qualified personnel perform the installation,
troubleshooting, and maintenance work. Do not perform
any electrical work unless you are qualified to perform
such work.
2. Before performing any maintenance work inside a power
source, disconnect the power source from the incoming
electrical power.
3. Maintain cables, grounding wire, connections, power
cord, and power supply in safe working order. Do not
operate any equipment in faulty condition.
4. Do not abuse any equipment or accessories. Keep
equipment away from heat sources such as furnaces,
wet conditions such as water puddles, oil or grease,
corrosive atmospheres and inclement weather.
5. Keep all safety devices and cabinet covers in position and
in good repair.
6. Use equipment only for its intended purpose. Do not
modify it in any manner.
ADDITIONAL SAFETY INFORMATION -- For
more information on safe practices for electric arc welding and cutting equipment, ask
your supplier for a copy of "Precautions
and Safe Practices for Arc Welding, Cutting
and Gouging", Form 52-529.
The following publications, which are available from the
American Welding Society, 550 N.W. LeJuene Road, Miami, FL 33126, are recommended to you:
1. ANSI/ASC Z49.1 - "Safety in Welding and Cutting"
2. AWS C5.1 - "Recommended Practices for Plasma Arc
Welding"
3. AWS C5.2 - "Recommended Practices for Plasma Arc
Cutting"
4. AWS C5.3 - "Recommended Practices for Air Carbon Arc
Gouging and Cutting"
5. AWS C5.5 - "Recommended Practices for Gas Tungsten
Arc Welding“
6. AWS C5.6 - "Recommended Practices for Gas Metal Arc
Welding"“
7. AWS SP - "Safe Practices" - Reprint, Welding Handbook.
8. ANSI/AWS F4.1, "Recommended Safe Practices for
Welding and Cutting of Containers That Have Held
Hazardous Substances."
This symbol appearing throughout this
manual means Attention! Be Alert! Your
safety is involved.
The following definitions apply to DANGER, WARNING,
CAUTION found throughout this manual:
Used to call attention to immediate hazards which, if not avoided, will result in
immediate, serious personal injury or
loss of life.
Used to call attention to potential hazards which could result in personal injury
or loss of life.
Used to call attention to hazards which
could result in minor personal injury.
SECTION 1 DESCRIPTION
1.1 GENERAL
The Heliarc 350 AC/DC Welding Power Source is a
constant current AC/DC welding power source designed
for high quality tig and stick welding in both the AC and
DC mode. The unique characteristics of the magnetic
and solid state circuits provide excellent arc conditions
for all tig welding as well as high alloy stick electrodes.
The non-saturating current limiting reactor and electronic
feedback control prohibits high current surges inherent
with saturable reactors or solid state SCR control alone,
therefore reducing spatter on stick electrodes as well as
tungsten spitting when tig welding. The electronic firing
circuit utilizes a voltage compensating circuit which compensates for line voltage variations of ±10 percent.
Through its unique design, the Heliarc 350 AC/DC combines all of the latest state-of-the-art magnetic and solid
state concepts to provide the wide range(s) volt-ampere
curve characteristics needed for a constant current AC/
DC power source - see Figure 1-1.
1.2 DUTY CYCLE
Duty cycle is defined as the ratio of load time to the total
time. Standard current ratings are based on a 10-minute
cycle. This machine is rated at 60 percent duty cycle
which means the rated load (300 amps) is applied for a
total of 6 minutes and shut off for a total of 4 minutes in
a 10-minute period. However, if the welding current is
decreased, the duty cycle can be increased. Conversely,
if the welding current is increased, the duty cycle must be
decreased. Figure 1-2 enables the operator to determine
the safe output of the power source at various duty
cycles.
Table 1-1. Specifications
NEMA †Rated Output @
60% Duty Cycle
Open Circuit Voltage 79 V ac/72 V dc
Output
Current
Range In
Amperes
Input Voltage 208/230/460 V ac
Input Current @
Rated Load in
Amperes**
Power Factor
@ Rated Load
Welding Current AC/DC
Low Range
High Range
Voltage 208 230 460
w/o P.F.C.*
with P.F.C.*
w/o P.F.C.*
with P.F.C.*
Auxiliary Power Output
Dimensions: Width
Weight Approx. 600 lbs 270 kg
*P.F.C. (Power Factor Correction)
†Output Rating conforms to NEMA Rating EWI-1971 Class 1 (60).
‡3-amp. minimum with LOW AMP KIT, DC only.
**These are NEMA ratings and in some cases, the input currents will vary --
Depth
Height
300 Amps @ 32 Volts
AC/DC, Tig/Stick
5‡ to 50 Amps
20 to 380 Amps
1 Ph, 60 Hz
12399112
86
Approx. 71%
Approx. 88%
115 V ac, 15 Amp, 60
Hz
22-3/4 in. 578 mm
32 in. 813 mm
36 in. 914 mm
56
43
Figure 1-1. Volt-Ampere Curves
Figure 1-2. Duty Cycle Chart
For DC & AC Balanced Wave Only
5
SECTION 1 DESCRIPTION
SECTION 2 INSTALLATION
2.1 GENERAL
Proper installation can contribute materially to the satisfactory and troublefree operation of the power source. It
is suggested that each step in this section be studied
carefully and followed as closely as possible.
2.2 UNPACKING AND PLACEMENT
A. Immediately upon receipt of the power source, it
should be inspected for damage which may have
occurred in transit. Notify the carrier of any defects
or damage at once.
B. After removing the power source from the shipping
container, check the container for any loose parts.
Remove all packing materials.
C. Check air passages at front, bottom and rear of
cabinet for any packing materials that may obstruct
air flow through the power source.
D. If the machine is not to be installed immediately,
store it in a clean, dry, well-ventilated area.
E. The location of the welding machine should be
carefully selected to ensure satisfactory and dependable service. Using the lifting eyebolt, or a
forklift truck, place the power source in the desired
location. Choose a location relatively close to a
properly fused source of electrical power. Never lift
the unit with cylinder attached.
F. The machine components are maintained at proper
operating temperatures by forced air which is drawn
through the cabinet by the fan unit on the rear panel.
2.3 PRIMARY (INPUT) ELECTRICAL
CONNECTIONS
This welding power source is a single-phase unit and
must be connected to a single-phase power supply.
Although designed with line voltage compensation, it is
suggested the unit be operated on a separate circuit to
assure that the performance of the machine is not
impaired due to an overloaded circuit.
ELECTRIC SHOCK CAN KILL! Do not touch electrically live parts. Be sure that all power is off by
opening the line (wall) disconnect switch when
primary electrical connections are made to the power
source. To be doubly safe, check your input leads
with a voltmeter to make sure that all power is OFF.
A. A line (wall) disconnect switch, with fuses or circuit
breakers, should be provided at the main power
panel (see Figure 2-2). The primary power input
must have three insulated copper conductors (two
power leads and one ground wire). The wires may be
heavy rubber-covered cable, or may be run in a solid
or flexible conduit. Refer to table 2-1 for recom-
mended input conductors and line fuse sizes. Do
not connect the input conductors until step C.
Table 2-1. Recommended Sizes for
Input Conductors and Line Fuses
Input Requirements
Amp e re s
Volts
c d
Input & Gnd.
Conductor*
CU/AWG
Time-Delay
Fuse Size
Amps
The power source is designed to operate at up to 40 °C
(104 °F) ambient temperature. For this reason, locate
the machine in an open area where air can circulate freely
at front, bottom and rear openings Leave at least 2 feet
of clearance between the rear of the power source and
wall or other obstruction.
IMPORTANT
Do not use filters on this unit. Output ratings are
designed and based on an unobstructed supply of
"clean" cooling air drawn over its internal components. If cooling air is dirty (e.g., laden w/conductive
dust), the interior should be cleaned using low
pressure air (refer to Section 4).
6
Units Without Power Factor Correction.
208
230
460
Units With Power Factor Correction.
208
230
460
c
DC and AC balanced wave input current rating.
123
112
56
99
86
43
184
166
83
137
124
62
No. 1/0
No. 1
No. 6
No. 2
No. 3
No. 6
200
175
100
150
150
70
dAC unbalanced wave input current rating.
*Sized per National Electric Code for 75 °C rated conductors @ 30 °C
ambient using a 60-percent duty cycle based on the AC unbalanced wave
ampere ratings. Not more than three conductors in the raceway or cable.
Local codes should be followed if they specify sizes other than those
listed above.
SECTION 2 INST ALLATION
B. For access to input terminal board, remove the
screws which secure the right side panel of the power
source. The input terminal board, Figure 2-1, is
clearly marked to show the available primary voltage
connections which may be used. Set the voltage
links on this board to match your actual incoming
voltage (208, 230, or 460 volt single-phase). As
shipped from the factory, the input terminal board
voltage links are set up for 460 volt operation.
C. Thread the input conductor cables from the wall
disconnect switch through the strain relief hole in the
rear panel (see Fig. 2-2). Secure the cables with the
strain relief coupling provided, and then connect
conductors to terminals L1 and L2 (on the input
terminal board) using UL listed pressure wire connectors. Connect the ground wire to the grounding
stud provided on the chassis base near the input
terminal board.
It is of the utmost importance that the chassis be
connected to an approved electrical ground to prevent accidental shocking. Take care not to connect
the ground wire to any of the primary leads.
2.4 EXTERNAL POWER/CONTROL HOSE
CONNECTIONS
Verify that all electrical connections comply with
local electrical codes and especially with requirements established in booklet F-11-831 "High Frequency Stabilized Arc Welding Equipment", which
is packed with the power source.
Refer to Figure 2-2, for typical primary input, secondary
output, process gas and water, and torch connections
that are required for this unit's welding applications.
Before making any connections to the power source's
output terminals, make sure that all primary input
power to the power source is deenergized (off) at the
customer's disconnect switch.
The proper operation of the power source depends to a
great extent on the use of output cables that are insulated
copper, adequately sized, in good condition and properly
connected to the machine using UL listed pressure wire
connectors It is recommended that the output cables be
kept short as possible (this is particularly important for tig
applications using ACHF) and be of adequate current
carrying capacity. The resistance of the output cables
and connections cause a voltage drop which is added to
the voltage of the arc. Excessive cable resistance may
result in overloading as well as reducing the maximum
current output of which the power source is capable. The
welding output terminals are located on the front panel.
Table 2-2 will prove useful for selecting the recommended output cable size.
Figure 2-1. Input Terminal Board
D. Recheck all connections to make sure that they are
tight, well insulated, and that the proper connection
has been made.
Table 2-2. Recommended Welding Cable Sizes
Welding Total Length (Feet) of Cable in Weld Circuit*
Curren 50 100 150 200 250
200
250
300
*Total cable length includes work and electrode cables. Cable size is based on
direct current, insulated copper conductors, 60-percent duty cycle and a voltage
drop of 4 or less volts. The welding cable insulation must have a voltage rating
that is high enough to withstand the open circuit voltage of the machine.
2
1
1/0
2
1
1/0
1
1
1/0
1
1/0
2/0
1/0
1/0
3/0
7
SECTION 2 INSTALLATION
2.5 INSTALLATION OF OPTIONAL KITS
For installation of optional kits (if applicable) refer to
Section 2.6.
2.6 ACCESSORIES
A. Slope/Spotweld Control Module, P/N 680665.
The slope control features provide smoothly controlled welding starts and precise crater-free finishes
for critical manual tig welding applications; and the
spot-weld control features permit precisely timed
full-range spotwelding capability. For additional control function information, refer to operation section.
This control module is completely self-contained and
is designed for easy plug-in, bolt-on installation on
the left-side of the front panel (see parts illustrations
and wiring diagrams in this manual, and for installation instructions, see F-14-396A).
B. Analog Meter Module, P/N 680628. The voltmeter
and ammeter provide direct accurate indication of
AC and DC open-circuit and welding voltage, and
welding current The meter module is completely
self-contained and is designed for easy plug-in, bolton installation in the upper-left corner of the power
source front panel (see parts illustrations and wiring
diagrams in this manual, and for installation instructions, see F-14-395).
C. Power Factor Correction Kit, P/N 680632. When
installed in units without power factor correction, it
provides lower input current draw. The kit consists
of 3 prewired power factor capacitors that are mounted
on the left-rear chassis base of the unit (see parts
illustrations and wiring diagram in this manual, and
for installation instructions, see F-14-394).
D. Low Amp Kit (For DC Only), P/N 680631. This kit
is designed to enhance arc starting and arc stability
down to 3 amps for low range DC tig welding of thin-
gauge materials. Even lower weld currents, down
to 2 amps and lower, are attainable with this
option by readjusting a shunt lead "inside" the
power source -- see Section 4 for Shunt Adjustment procedures. The kit consists of an On-Off
switch and provision for a factory-supplied wire harnessed amp-type receptacle (for connecting an external optional "pulse control" and a thermally-protected internal inductor. For installation procedures,
see booklet F-14-398.
IMPORTANT
This option (Item D.) cannot be installed if a panelmounted Pulse option (Item E.1.) is installed because they both use the same front-panel mounting
location; however, it can be installed if the external
Pulse Control option (Item E.2.) is used.
E. Pulse Control Module, P/N 680693. The Pulse
Control module "pulses" the power source output,
giving the operator more precise control over penetration, heat input and bead shape. This pulsing
output current results in high quality tig or tig/spot
welds requiring less operator skill. This module is
completely self-contained and is designed for easy
plug-in (to an internal receptacle provided in the
wiring harness), bolt-on installation in the same frontpanel location as, but in place of the Low-Amp Kit
option. For installation instructions, see F-14-397;
for replacement parts, see this manual.
F. FC-4EHD Foot Switch Current and Contactor
Control, P/N 679662. This device provides the
operator with remote control of current and contactor
operation at the welding station. Interconnection of
these functions to the main unit is provided by a pair
of mating 25-foot cable/plug assemblies. By depressing the foot pedal, the weld-start sequence
circuit will energize, and the welding current will
increase or decrease within the range preset on the
power source Current Control potentiometer.
G. TC-1A Torch Current and Contactor Control,
P/N 34718 (25-Ft Lg.). This remote fingertip control
is designed to be taped to any tig torch handle and it
allows the operator complete contactor control and
variable control of the welding current. The TC-1A
includes prewired current and contactor control plugs
which are compatible for use on ESAB solid-state
type, constant current power sources. The control
knob of this torch handle potentiometer/switch is
designed for right- and left-handed accessibility. By
simply rotating the knob clockwise (off of zero) the
intergral switch will energize the contactor, and further regulation (clockwise) will increase the output
current up to the limit preset on the power source
main control.
H. Torch Switch Assembly, P/N 674038. This device
is designed to be attached to any tig welding torch,
and provides the operator with remote contactor
operation at the welding station. Interconnection to
the power source is provided by its 12-1/2-ft cable/
plug assembly.
8
SECTION 2 INST ALLATION
Figure 2-2. Interconnection Diagram
9
SECTION 2 INSTALLATION
I. Current Hand Control, P/N 674209. This acces-
sory operates in series with the power source's 'main
current control' potentiometer to provide remote (up
to 25-ft) current regulation. The hand control
potentiometer's current adjustment is always controlled by and limited to the range that is preset on the
main current control.
J. WC-9 Coolant Circulator, P/N 33540, is used for
water cooled torch operation and is designed to be
"free standing" in a convenient location near the
torch. A four-gallon capacity tank provides 1.0 gal/
min @ 50 psi, using 6 amps, 115 volts, 60 Hertz, 1phase input. Since the circulator is designed to run
continuously during a welding operation, never connect it to a power source that uses a solenoid
controlled water supply that opens and closes with
each operation of the welding contactor -- the cooling
efficiency of the unit will be hampered and the
starting winding in the pump motor may burn out.
Refer to Figure 2-2 for suggested hose hookup.
K. WC-8C Coolant Circulator, P/N 33739, is used for
water cooled torch operation and is designed to fit in
a cylinder rack of a power source truck (item M). A
1.5 gallon capacity tank provides 1 gal/min @ 50 psi,
using 6 amps, 115 volts, 60 Hertz, 1-phase input.
Since the cooler is designed to run continuously
during a welding operation, never connect it to a
power source that uses a solenoid controlled water
supply that opens or closes with each operation of
the welding contactor -- the cooling efficiency of the
unit will be hampered and the starting winding in the
pump motor may burn out. Refer to Figure 2-2 for
suggested water hose hookup.
L. TR-21 Truck, P/N 680794. Provides complete mo-
bility for power source or welding outfit and includes
a bracket for two gas cylinders or one gas cylinder
and a WC-8C water cooler.
M. Water Solenoid Valve Kit, P/N 30570. This kit
comes completely assembled and ready for mounting in place of the existing bulkhead fittings provided
for the WATER IN service on the rear panel of the
power source. It is identical to the gas assembly,
except that its hose adaptor connection is a left-hand
fitting (58V75). To install the solenoid assembly,
refer to instruction sheet F-14-452.
10
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