Hypertherm HT400 Air Injected Water Muffler System - Manual (Page 25)

OPERATION & MAINTENANCE
Page 3-4 Air Injected Water Muffler System
Instruction Manual
Pump Unit
If the pump is faulty and requires maintenance, refer to the maintenance instructions
for the water muffler pump in the Appendix at the back of this manual. Pump mainte-
nance also includes inspecting all hoses and connections and replacing as needed.
The suction filter/strainer should also be checked and cleaned periodically.
Filter/Strainer
The pump with 50 feet of 3/4-inch (15.3 m of 19mm) ID hose and the W-M nozzle
assembly should produce a flow of approximately 20 gallons per minute. A flow
lower than 18 gallons per minute reduces water muffler effectiveness. If this situation
occurs clean the filter/strainer in the water table.
To clean the suction filter/strainer, remove the screw and the plastic cover at the
bottom. See Figure 2-2. After cleaning the filter/strainer, replace the cover and
screw it back on.
Pump Contactor
If the pump contactor or 120 VAC relay coil is defective, contact an experienced
electrician to perform the maintenance.
Air Conrol Box & Pump Contactor 120 VAC Control Signals
If the 120 VAC control signal to air control box and/or pump contactor is missing,
refer to
Installation, Section 2, Figure 2-3 and the wiring diagram of the applicable
instruction manual for the missing control signals.
TECHNICAL QUESTIONS
If you are unable to solve a problem after reviewing this manual, the applicable
instruction manual, and wiring diagram:
• Call your distributor. They will be able to help you, or refer you to an authorized
Hypertherm repair facility.
• If you need additional assistance, call our Field Service group at 1-800-643-9878.