LMI Roytronic Series A Pump Precautions

The following precautions should be taken when working with LMI metering pumps. Please read this section carefully prior to installation.

 Protective Clothing

Precautions Pump OperationALWAYS wear protective clothing, face shield, safety glasses and gloves when working on or near your metering pump. Additional precautions should be taken depending on the solution being pumped. Refer to MSDS precautions from your solution supplier.

Water Pre-Prime

Precautions Pump OperationAll LMI pumps are pre-primed with water when shipped from the factory. If your solution is not compatible with water, disassemble the Pump Head Assembly. Thoroughly dry the pump head, valves, seal rings, balls and Liquifram™ (diaphragm). Reassemble head assembly tightening screws in a crisscross pattern. Refill the pump head with the solution to be pumped before priming the pump. (This will aid in priming.)


Liquid Compatibility

Precautions Pump OperationCAUTION: The evaluation performed by UL was tested with water only. LMI pumps are tested by NSF for use on muriatic acid and sodium hypochlorite. Determine if the materials of construction included in the liquid handling portion of your pump are adequate for the solution (chemical) to be pumped. Always refer to the solution supplier and the LMI Chemical Resistance Chart for compatibility of your specific LMI metering pump. Contact your local LMI distributor for further information.

Tubing Connections

Precautions Pump OperationInlet and outlet tubing or pipe sizes must not be reduced. Outlet tubing size must not be increased. Make certain that all tubing is SECURELY ATTACHED to fittings prior to start-up (see Section 3.3, Tubing Connections). ALWAYS use LMI supplied tubing with your pump, as the tubing is specifically designed for use with the pump fittings. It is recommended that all tubing be shielded and secure to prevent possible injury in case of rupture or accidental damage. If tubing is exposed to sunlight, black UV resistant tubing should be installed. Check tubing frequently for cracks and replace as necessary.

Vinyl Tubing

Precautions Pump OperationYour carton may contain a roll of clear vinyl tubing; this is only for connection to the return line of the FastPrime™ Head and must not be used as discharge tubing.

Fittings and Machine Threads

Precautions Pump OperationAll 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 overtightening 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 Teflon® tape or pipe dope to seal threads. Teflon® 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.


Precautions Pump OperationAlways 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

Precautions Pump OperationIf you are pumping downhill or into low or no system pressure, a back pressure/anti- syphon device such as LMI’s Four-Function Valve should be installed to prevent overpumping or syphoning. Contact your LMI distributor for furthur information.

Electrical Connections

Precautions Pump OperationWARNING: 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.

Ground Fault Circuit Interrupter

Precautions Pump OperationWARNING: To reduce the risk of electric shock, install only on a circuit protected by a Ground Fault Circuit Interrupter (GFCI).

Line Depressurization

Precautions Pump OperationTo reduce the risk of chemical splash during disassembly or maintenance, all installations should be equipped with line depressurization capability. Using LMI’s Four-Function Valve (4-FV) is one way to include this feature.

Over Pressure Protection

Precautions Pump OperationTo ensure safe operation of the pump it is recommended that some type of safety/pressurerelief valve be installed to protect the piping and other system components from failing due to excessive pressure.

Chemical Concentration

Precautions Pump OperationThere 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

Precautions Pump OperationPlastic 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 inchpounds after the first week of operation and on a monthly basis thereafter.

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