Tweco 161 S Inverter Arc Welder - Manual (Page 25)

INSTALLATION THERMAL ARC 161 S
Manual 0-5199 3-9 Installation
!
WARNING
DO NOT attach or use the regulator if oil,
grease, flamma ble substances or damage is
present! Have a qualified repair technician
clean the regulator or repair any damage.
Art # A-09845
Figure 3-5: Regulator to Cylinder Valve
7. Before opening the cylinder valve, turn the
regulator adjusting screw counterclockwise until
there is no pressure on the adjusting spring and
the screw turns freely.
8. Relief Valve (where provided): The relief valve is
designed to protect the low pressure side of the
regulator from high pres sures. Relief valves are
not intended to protect down stream equipment
from high pressures.
!
WARNING
DO NOT tamper with the relief valve or remove
it from the regulator.
!
WARNING
Stand to the side of the cylinder opposite the
regulator when opening the cylinder valve.
Keep the cylinder valve between you and the
regulator. For your safety, NEVER STAND IN
FRONT OF OR BEHIND A REGULATOR WHEN
OPENING THE CYLINDER VALVE!
9. Slowly and carefully open the cylinder valve
(Figure 3-6) until the maximum pressure shows
on the high pressure gauge.
Art # A-09828
Figure 3-6: Open Cylinder Valve
10. On all cylinders, except acetylene, open the valve
completely to seal the valve packing. On gaugeless
regulators, the indicator will register the cylinder
contents open.
11. On acetylene cylinders, open the valve 3/4 of a
turn and no more than 1-1/2.
!
WARNING
Acetylene delivery pressure must not exceed
15 PSIG (103 kPa) or 30 PSIG (207 kPa).
Acetylene can dissociate (decompose with
explosive violence) above these pressure
limits.
CAUTION
Keep the cylinder valve wrench, if one is
required, on the cylinder valve to turn off the
cylinder quickly, if necessary.
12. Attach the desired downstream equipment.