iii
Instruction Manual
Fittings and Machine Threads
All fittings should be hand-tightened. An additional 1/8 - 1/4 turn after the fitting is snug may
be necessary to provide a leak-proof seal. Excessive over tightening or use of a pipe wrench
can cause damage to the fittings, seals, or pump head. All LMI
®
pumps have straight screw
machine threads on the head and fittings and are sealed by the O-rings.
DO NOT use PTFE
tape or pipe dope to seal threads. PTFE Tape may only be used on the 1/2” NPT thread
side of the Injection Check Valve, the stainless steel liquid end connections, or if
piping is directly connected to the pipe threads of the suction or discharge fittings.
Plumbing
Always adhere to your local plumbing codes and requirements. Be sure installation does
not constitute a cross connection. Check local plumbing codes for guidelines. LMI
®
is not
responsible for improper installations.
Back Pressure / Anti-Syphon Valve
If you are pumping downhill or into low or no system pressure, a back pressure / antisyphon
device such as LMI
®
’s Four-Function Valve (4-FV) should be installed to prevent over
pumping or syphoning. Contact your LMI
®
distributor for further information.
Electrical Connections
WARNING: To reduce the risk of electrical shock, the metering pump must be plugged into
a properly grounded grounding-type receptacle with ratings conforming to the data on the
pump control panel. The pump must be connected to a good ground.
Do not use adapters!
All wiring must conform to local electrical codes. If the supply cord is damaged, it must be
replaced by the manufacturer, stocking distributor, or authorized repair center in order to
avoid a hazard.
Over Pressure Protection
To ensure safe operation of the pump it is recommended that some type of safety / pressure
relief valve be installed to protect the piping and other system components from failing due to
excessive pressure.
Chemical Concentration
There is a potential for elevated chemical concentration during periods of no flow, for
example, during backwash in the system. Steps, such as turning the pump OFF, should be
taken during operation or installation to prevent this. See your distributor about other external
control options to help mitigate this risk.
Retightening Components
Plastic materials will typically exhibit creep characteristics when under pressure over a period
of time and to insure a proper fit it may be necessary to retighten the head bolts periodically.
To insure proper operation, we recommend tightening the bolts to 25 inch pounds during
installation after the first week of operation and on a monthly basis thereafter.
