Walchem EH Series, Instruction Manual

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Problem Possible Cause Corrective Action
Output fluctuates Suction or discharge Disassemble, inspect, clean
valve is clogged with
foreign matter
Air is trapped in pump Open air vent valve
Overfeeding Install injection valve or back
pressure valve
Diaphragm is damaged Replace diaphragm
Liquid leaks
Fitting or coupling nut is loose Re-install (see section 2.3/2.4)
Pump head is loose Tighten pump head bolts
Torque: 19 lb-in (2.16 N-m)
Diaphragm is damaged Replace diaphragm
O-ring or valve gasket Install o-ring or valve gasket
missing
7.0 SERVICE POLICY
The EH and EZ Series electronic metering pumps have a 2-year warranty.
Contact your Walchem distributor for service.