Lincoln Electric 718115 Spirit II 275 - Manual (Page 41)

Spirit II User’s Manual Section 3: Installation
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Gas Supply Connections
Perform the following steps to connect the gas supply lines to the AGC. See Section 2
for gas supply requirements. Mating hose barbs and connectors are supplied with the
system and are sized for 3/8 inch inside diameter hose. Do not change the inlet gas
supply fittings to quick-connect fittings. Using quick-connect fittings to connect
and disconnect pressurized hoses may cause damage to the system.
Note: When making hose connections, only tighten the brass fittings enough to
make gas seals. The fittings are subject to damage if over tightened.
Air Inlet (ISO 3821 hose color - black)
• Air must be supplied to the unit at all times, regardless of the cutting current or
material type.
Oxygen Inlet (ISO 3821 hose color - blue)
• Oxygen must be supplied to the unit at all times, unless stainless steel is being cut
with H17 plasma.
Nitrogen Inlet (ISO 3821 hose color - black)
• Nitrogen must be supplied to the unit at all times, regardless of the cutting current or
material type.
H17 Inlet (ISO 3821 hose color - red)
• H17 must be supplied to the unit when stainless steel is being cut with H17 as the
plasma gas. See cutting charts in Section 5 for more information.
Argon Inlet
• Argon is optional and provides improved marking capabilities. If not used, this inlet
should be capped.
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