Arc Machines 207 - Manual (Page 19)

MODEL 207A AND 207A-1
OPERATION MANUAL
Doc. No. 740044
Rev F
SECTION III - INSTALLATION
3.2 WELDING GAS CONNECTIONS
2. (continued)
NOTE
The arc gas line is controlled by a solenoid and flow sensor in the M-207A
and MUST BE connected to the M-207A (not directly to the weld head or
torch).
After installing the hose and fittings loosely by hand, tighten the retaining
nuts slightly with a wrench to insure there are no leaks, but do not over-
tighten. The use of plumbers tape or grease is not recommended.
CAUTION
The M-207A arc gas solenoid valve is rated at 50 PSI (345 KPa) maximum
pressure, DO NOT EXCEED THIS RATING.
3. The other 10’ (3 m) hose is intended for I.D. PURGE GAS INPUT and its
connection to and through the M-207A is optional. It is supplied with fittings
to connect from the gas source regulator/flowmeter to the PURGE GAS
input bulkhead fitting on the M-207A.
The M-207A does not supply a solenoid for control of I.D. PURGE GAS.
The line feeds straight through to the output quick-disconnect. If the output
hose is plugged in, gas will flow at all times. This feature is best for bench-
type weld development but not normally used for field I.D. purging of long
lengths of tube.
If you wish to use this option, install the hose and fittings loosely by hand,
tighten the retaining nuts slightly with a wrench to insure there are no leaks,
but do not over-tighten. The use of plumbers tape or grease is not
recommended (see figure 4).
4. The 25 foot (7.6 m) hose is intended to supply the I.D. purge from the M-
207A to the weld. One end has a quick-disconnect on it that mates with the
PURGE GAS output bulkhead fitting on the M-207A. If used, the quick-
disconnect provides a convenient method for starting or stopping the flow of
I.D. purge gas. If you wish to use this option, insert the male quick-
disconnect of the hose into the M-207A connector labeled PURGE OUTPUT
(see Figure 2 and 4).
3.6