Duro Dyne MF12 Owner's Manual - Page 2

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H. WEISS MACHINERY & SUPPLY

ELECTRICAL REQUIREMENTS

Connect the MF-12 to a 30 amp power supply. (208-

230 volts – 60 cycle). The MF12 uses 208 – 230

volt single phase. To wire to 208-230 volt single

phase, the green lead is ground and the white and

black leads are power. It is suggested that the unit

be permanently wired into a 30 amp disconnect box

fitted with 30 amp slow blow fuses.

MF-12 AS A BENCH TOOL

To use your work bench as a welding table, set the

MF-12 alongside or on top of the work bench. Cover

the bench top with a copper sheet (.025 inch) which

will act as a permanent ground when the duct work

is placed on the table top. Attach the MF-12 ground

clamp to the duct work or copper bench top. The Clip

Pins will quickly weld every time with no burn marks

or wasted pins due to misfires.

BRING MF-12 TO THE WORK

Where duct is too large to put on a bench, snap the

ground clamp onto the duct and secure the insula-

tion quickly by welding the Clip Pins inside or outside

of the ducts as required. Eliminate the heat mark on

the duct using the simple "heat sink" supplied on the

opposite side of the weld.

SERVICE

The MF-12 has been designed and built to withstand

rugged shop usage. The Indicator lights on the front

panel will help you to diagnose minor problems. If your

MF-12 fails to operate follow this simple procedure

to find the defective component.

1. Pull the trigger and watch the lights. The green

light (24 volts) and then the red light (220 volts)

should flash on and off.

2. If only the green light comes on, go to step 4.

3. If neither light comes on, press the WELD CYCLE

TEST switch on the front panel.

A. If both lights flash and the transformers do not

hum go to step 5.

B. If both lights flash and the transformers hum,

the problem is either a bad trigger switch or

bad switch cable.

C. If only the green light flashes, go to step 4

D. If neither light flashes, replace 24 volt trans-

former.

4. Replace the weld activator.

5. The problem is probably a bad weld transformer.

Call technical service for further assistance.

(1-800-899-3876)

PHONE: (718) 605-0395 - www.hweiss.com

TIMER ADJUSTMENT

The timer dial facing you on the front panel of the

unit, determines the duration of the weld cycle. For

maximum efficiency of the unit, the weld cycle should

be set for the shortest length of time necessary to

provide a good weld. An excessive amount of time does

not improve the weld. On the contrary, the resulting

weld may not be an acceptable one. It is recommended

that at the start of a production run, using a given

length of pin with a given gauge of metal, the opera-

tor take a few moments to determine the minimum

timer setting to perform the job and leave the timer

at that point.

NOTE: There is a common misconception that the

longer the weld time, the stronger the weld. This is

not true. It is important that you follow the above

instructions for maintaining the minimum weld time.

"HEAT SINK"

Included with your MF-12 is a simple "heat sink" tool

that looks somewhat like a cookie cutter. This tool,

when placed behind the point of weld on bare metal,

will eliminate any mark on the metal by dissipating the

heat generated from the point of the weld. The use of

a copper sheet on the work bench will also eliminate

this mark.

MAINTENANCE

The MF-12 has been designed and built to withstand

rugged shop. Constant, trouble-free operation is as-

sured with a minimum of maintenance. The GUN TIP ,

the GROUND CLAMP and all CABLE CONNECTIONS

should be kept clean to maintain a good electrical

contact. Wire brush the parts to remove any oxida-

tion or adhesive that may have accumulated during

the fastening operation.

INSTALLING CLIP PINS

Clip Pins are welded as easily as "A", "B", "C".

"A"

Position the Clip pin on the

Magnetic tip of hand gun.

"B"

Press down through the insu-

lation, twist the gun, and pull

the trigger. Do not release

the trigger until the timer

cycle has ended.

"C"

The Clip Pins are

permanently welded

in position flush with

the insulation.