Hypertherm HT400 Air Injected Water Muffler System - Manual (Page 20)

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INSTALLATION
Air Injected Water Muffler System
Instruction Manual
Installation Checkout
After all power, air and water connections have been completed, test the Air Injected
Water Muffler System:
1. Ensure that the water table water level is high enough to feed the pump (covers
the filter intake completely).
2. Apply primary power to the power supply.
3. Apply shop air to the air control box. Inside the box, ensure the ON/OFF/SET
switch is to OFF.
4. Depress the green POWER ON switch to turn on the power supply.
5. In the air control box, momentarily position the ON/OFF/SET switch to SET and
then back to OFF.
Look for a clockwise pump rotation as viewed from the top of the motor. A
direction of rotation arrow is also shown on the side of the pump casing. If
the pump rotates in a counterclockwise direction, reverse any two of the 3-
phase power leads to the motor.
Caution: Operating the pump in reverse rotation will cause extensive
damage.
6. Inside the air control box, position the ON/OFF/SET switch to SET. With water
and air flowing, check the pressure gauge for 17 psig (1.2 bar) for above- water
cutting or 30 psig (2.0 bar) for underwater cutting. Adjust the pressure regulator,
if required.
7. Check for an even flow of water around the torch and for leaks around all
connections. Tighten connections as necessary. The water pump should deliver
approximately 18 to 20 gallons per minute.
8. Readjust the air pressure as performed in step 6, if required.
9. Position the ON/OFF/SET switch to ON. The system is now operational.
Pump Discharge Hose Water Recovery Checkout
If the pump discharge hose is routed through an overhead festoon system, a check
valve may be required. This can be determined by checking to see if the water from
the pump discharge hose drains back through the pump when the water muffler
system shuts off, and when the water muffler system restarts, the water does not
obtain full flow back to the water muffler before the plasma arc fires. If this condition
occurs, a check valve needs to be installed according to the procedure that follows.
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