LMI Roytronic Series A Pump Instruction Manual

Instructions Roytronic PumpPrecaustions Pump OperationCarefully read and understand all precautions
before installing or servicing any metering pump.


1.0 Precautions
2.0 Introduction
2.1 Specifications
2.2 Unpacking Check List
3.0 Installation
3.1 Pump Location and Installation
3.2 Pump Mounting
3.2.1 Flooded Suction
3.2.2 Suction Lift – Wall Bracket Mount
3.2.3 Suction Lift – Tank Mount
3.2.4 Suction Lift – Shelf Mount
3.3 Tubing Connections
3.4 Four-Function Valves (4-FV)
3.5 Four-Function Valve Installation
3.6 FastPrime™
3.7 AutoPrime™
3.8 Foot Valve/Suction Tubing Installation
3.9 Injection Check Valve and Discharge Tubing Installation
4.0 Operation
4.1 Output Adjustment Controls
4.2 Start-up and Adjustment
4.2.1 Start-Up/Priming for FastPrime™ Heads
4.2.2 Start-Up/Priming for Pump Supplied with 4-FV
4.2.3 Start-Up/Priming Without 4-FV
4.3 Output Adjustment
4.3.1 Total Pump Output
4.3.2 Calibration in Internal Mode
4.3.3 Calibration in External Mode
4.4 Methods of Externally Triggering or Pacing A3, A7, and A8 Pumps
4.4.1 Control Modes
4.4.1.1 Local Mode
4.4.1.2 Remote Mode (for A3, and A7)
4.4.1.3 Remote Mode (for A8)
5.0 Spare Parts Replacement and Routine Maintenance
5.1 Depressurizing the Discharge Line (for Pumps Equipped with a 4-FV Only)
5.2 Depressurizing The Discharge Line (for Single Ball FastPrime™ Heads Only)
5.3 Liquifram™ (Diaphragm) Replacement
5.4 Cartridge Valve and O-Ring Replacement
5.5 Injection Check Valve Parts Replacement
5.6 FastPrime™ Valve O-Ring Replacement
5.7 Stroke Length Setting
5.8 A Drive Parts List
5.9 EPU Wiring Diagram
5.10 Liquid End Parts List
6.0 Troubleshooting

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.


Plumbing

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.

Introduction

LMI is the world’s most versatile manufacturer of economical and efficient metering pumps. This manual addresses the installation, maintenance and troubleshooting procedures for manually and externally controlled pumps. LMI has a worldwide network of stocking representatives and authorized repair centers to give you prompt and efficient service.

Please review this manual carefully. Pay particular attention to warnings and precautions. Always follow good safety procedures, including the use of proper clothing, eye and face protection. 

This manual is for Roytronic® Series A pumps.


Specifications

Roytronic LMI


Unpacking Check List

Your carton will contain many or all of the following items. Please notify the carrier immediately if there are any signs of damage to the pump or its parts.

Roytronics Pump Parts

Pump Location and Installation

Locate pump in an area convenient to solution tank and electrical supply.

The pump should be accessible for routine maintenance, and should not be operated in ambient temperatures above 113°F (45°C). If the pump will be exposed to direct sunlight, LMI black, UV resistant tubing should be installed.

This pump is cord connected and not intended for permanent mounting to a building. However, temporary mounting to stabilize the pump during operation may be necessary as long as tools are not required for the installation or removal of the pump.


Pump Mounting

The pump can be mounted in one of two ways:

A.  FLOODED SUCTION (ideal installation); or

B.  SUCTION LIFT – when suction lift is less than 5 feet (1.5 m) for solutions having a specific gravity of water or viscosity of less than 100 cSt (centistokes). For denser or more viscous solutions, consult distributor.

Note that suction conditions can affect the performance of the pump. This effect is more pronounced with lower pressure pumps. Consult your distributor for additional information.

Your LMI metering pump must be mounted so that the suction and discharge valves are vertical. NEVER position pump head and fittings horizontally. 


Flooded Suction

Precautions Pump OperationFor flooded suction the pump is mounted at the base of the storage tank. This installation is the most trouble-free, and is recommended for very low outputs, solutions that gasify, and high-viscosity solutions. Since the suction tubing is filled with solution, priming is accomplished quickly and the chance of losing prime is reduced. A foot valve is not necessary in a flooded suction installation.

When pumping downhill or into low or no pressure system, a back pressure/anti-syphon device should be installed to prevent overpumping or syphoning.

Although popular for all solutions, LMI recommends flooded suction installations for all high-viscosity fluid applications.

Roytronic operation LMI Pump Operation


Suction Lift – Wall Bracket Mount

The pump may be mounted using an LMI Wall Mount Bracket  Assembly (part no. 34643) directly above the solution tank. A pump mounted in this manner allows for easy changing of solution tanks or drums.


Suction Lift – Tank Mount

The pump may be mounted on a molded tank provided there is a recess to keep the pump stationary. LMI 10-gallon tank (part no. 27421), 35-gallon tank (part no. 27400), and 50-gallon tank (part no. 26350) have molded recesses for pump mounting.


Suction Lift – Shelf Mount

The pump may be mounted on a shelf (customer supplied) maintaining a suction lift of less than 5 ft (1.5 m). An LMI mounting kit (part number 10461) is available for securing the pump to a shelf.LMI Instructions

 

Tubing Connections

Precautions Pump OperationUse only LMI tubing.

DO NOT USE CLEAR VINYL TUBING ON THE DISCHARGE SIDE OF THE PUMP. The pressure created by the pump can rupture vinyl tubing, which is only for connection to the return line of the FastPrime™ fitting.

Precautions Pump OperationBefore installation, all tubing must be cut with a clean square end.

Valve and head connections from the factory are capped or plugged to retain pre-prime water. Remove and discard these caps or plugs before connecting tubing.

DO NOT USE PLIERS OR PIPE WRENCH ON COUPLING NUTS OR FITTINGS.

To assemble tubing into the fittings:

  1. Put coupling nut over tubing.
  2. Press on Ferrule – Female about one inch (25 mm).
  3. For 1⁄4″ or 6mm OD tubing cut tubing so that only 1⁄4″ to 3⁄8″ (5-10 mm) protrudes from the Ferrule. For all other tubing push the tube to the bottom of the groove in the Ferrule – Male.
  4. Firmly hand tighten the coupling nut onto the fitting. Tightening with pliers may cause the ferrules to break.

Manual LMI Pump


Four-Function Valves (4-FV)

Your pump may be equipped with a 4-FV, or standard discharge valve. If your pump is not equipped with a four-function valve and you feel it is needed in your application, it can be purchased as an  accessory. Contact your local LMI stocking distributor. The features of a 4-FV are listed below.

  1. Pressure Relief: If the discharge line is over pressurized, the valve opens sending solution back to the supply tank.
  2. Line Depressurization: Opening the relief knob provides line drain back to the supply tank.
  3. Anti-Syphon: Prevents syphoning when pumping solution downhill or into a vacuum.
  4. Back Pressure: Supplies approximately 25 psi back pressure to prevent overpumping when little or no system back pressure is present.

LMI Chemical Pumps US

Typical Installations Requiring the Anti-Syphon
Feature of a Four-Function Valve


Four-Function Valve Installation

Four-Function Valve Tubing Connection

Valve Body LMI
Click to Enlarge Image

Four-Function Valve Tubing Connection

To install a 4-FV, the 4-FV Fitting and Coupling Nut should be assembled with the appropriate cartridges into the discharge port of the pump. Use a 13/16” or 20 mm socket to tighten fitting. Tightening to 50 inch-pounds is recommended. Do not over tighten.

To assemble the Four-Function Valve Body, assemble the coupling nut and the threads at the bottom of the body. Firmly hand tighten the body in the desired orientation. Next, insert the ¼” tubing through the Bleed Nut. Ensure that about ¼” (6 mm) of tubing is protruding through the tip of the Bleed Nut. Firmly hand tighten the Bleed Nut in the hole on the side of the 4-FV. This tubing should be routed back to the supply tank. To ensure proper function of the priming function, the end of this tubing should not be submerged in the solution..

Four-Function Valve Tubing Connection

Precautions Pump OperationThis return line tubing must be secured to ensure pumped solution will safely return to supply tank.

 

FastPrime™

The FastPrime™ Head is equipped with a valve that allows for opening the head to atmospheric pressure. When installing a pump equipped with a FastPrime™ Head connect the 3/8″ outer diameter clear vinyl tubing provided with the pump to the barbed nozzle. Route the vinyl return line back to the solution tank. This tubing must not be submerged in the solution.Metering Pump


AutoPrime™

The AutoPrime™ Liquid End is equipped with a valve that allows for constant removal of vapors and gasses inherent with effervescent chemicals such as Sodium Hypochlorite and Hydrogen Peroxide. The valve keeps the pump primed automatically. When installing a pump equipped with an AutoPrime™ Liquid End connect the 1/2″ OD Polyethylene tubing to the top vertical fitting, and route this line back to the supply tank. To ensure priming, this tubing should not be submerged in the solution. The horizontal fitting is the discharge, and the bottom vertical fitting is the suction.Series A Instruction manual


Foot Valve/Suction Tubing Installation

Suction Tubing InstallationThe Foot Valve acts as a check valve to keep the pump primed in suction lift applications.

The foot valve is designed to be submersed in the solution tank or drum and must sit in a vertical position at the bottom. Position approximately 2 inches (50 mm) off the bottom if the tank or drum contains sediment.

The ceramic weight, when installed, helps position the foot valve in a vertical position.

  1. Attach the foot valve to one end of the suction tubing (see Tubing Connections, Section 3.3).
  2. Slide the ceramic weight over the tubing end until it contacts the top of the foot valve coupling nut.
  3. Place foot valve and tubing into the solution tank. Check that the foot valve is vertical and approximately 2 inches (50 mm) from the bottom of the tank or drum (see illustration). Connect the other end of the tubing to the suction side of the pump head (bottom side) (see Tubing Connections, Section 3.3).

Chemical Pumps US Manual



Injection Check Valve and Discharge Tubing Installation

The Injection Check Valve prevents backflow from a treated line. Install the injection check valve at the location where chemical is being injected into the system. Any size NPTF fitting or pipe tee with a reducing bushing to 1/2″ NPTF will accept the injection check valve. Teflon® tape should only be used on threads that are connected with pipes.
When installing the Injection Check Valve, be sure to position it so that the valve enters the bottom of your pipe in a vertical position. Variations left and right within 80° are acceptable (see illustration).
After cutting an appropriate length of tubing, connect tubing to the injection check valve then back to the discharge side of the pump head. Make sure it does not crimp or come into contact with hot or sharp surfaces (see Tubing Connections, Section 3.3).

LMI Pump Manual

Output Adjustment Control

  1. LMI Seies A Manual
    Click image to see larger view

    Power/Mode Selection Button: This button allows convenient starting and stopping of the pump. For pumps with external control capability (A3, A7, A8) this button switches pump operation between internal and external modes. When operating in internal mode the Pulse Indicator Light will flash green. When operating in external mode the Pulse Indicator Light will flash yellow.

  2. Speed Adjustment Knob: This knob provides adjustment of the stroking speed. For pumps with this knob (A1, A7, A8) turning this knob clockwise  increases stroke frequency (speed) from a minimum of 1 stroke per minute.
  3. Stroke Adjustment Knob: This knob provides adjustment of the stroke length. Turning this knob clockwise P increases the stroke length, which results in a higher amount of chemical displaced per stroke. It is recommended that the stroke range stay between 20% and 100%.
  4. Pulse Indicator Light: This light will flash green when pumping in internal mode, and will flash yellow when pumping in external mode. The light is on between strokes and off during the actual stroke.
  5. LMI Series-A InstructionsLow-Level Indicator Light: This light will turn red when a Low-Level Sensor registers a low chemical level. This will turn off the pump. You must have a Low-Level Sensor connected to the pump through the LowLevel Connector for this function to operate.
  6. Low-Level Connector (3-Pin): This connector is for the connection of a Low-Level Sensor (48413). The low-level switch input connections are always active for all models in all functional modes. If the fluid level drops below the level specified by the Low-Level Sensor, the pump will stop and the Low-Level Indicator Light will turn on. The pump is designed to recognize an open circuit as full, and a closed circuit as empty. The pin functions are as follows:
    1. Low Level Signal
    3. No Connection
    4. Ground/Return ConnectionExternal Control Connector7. External Control Connector (5-Pin): This connector is for the connection of various options and accessories that can be used to externally control the pump. The pin functions (and the wire color for the standard LMI external control cable) are as follows:

1. Remote On Signal (Brown)
2. Ground/Return Connection (White)
3. External Pulse Signal (Blue) (used only with A3, and A7 Series pumps)
4. 15 Volt Supply Voltage (Black)
5. 4-20mA Input Signal (Green/Yellow) (used only with A8 Series pumps).

Some of the accessories available for use with A3, and A7 Series metering pumps are listed below. Note that an Adapter Cable (48488) is needed when connecting any of the MICROPACE(TM) units or flowmeters.

A. MICROPACE™ A/D Converter (MP-100) – for translating a 4-20 milliamp signal into an analog signal.

B. MICROPACE™ Divider (MP-400D) – for reducing the frequency of high frequency pulses.

C. MICROPACE™ Multiplier (MP-500M) – for increasing the frequency of low frequency pulses.

D. Pulse Transmitter (48489) – for pulsing in time with another LMI Electronic Metering Pump.

E. RFP Flowmeter and Programmable Divider – for pacing the stroke frequency off of the system flow.

F. FC Flowmeter/Contactor – for pacing the stroke frequency off of the system flow.

Start-up and Adjustment

  • The pump is normally self-priming if suction lift is 5 ft (1.5m) or less and the steps below are followed.
  • Pumps are shipped from the factory with water in the pump head to aid in priming.

Start-Up/Priming for FastPrime™ Heads

Read this entire section completely before proceeding.

When all precautionary steps have been taken, the pump is mounted, and the tubing is securely attached, you may now start priming the pump.

  1. Plug in or switch the pump on.
  2. While the pump is running, set the Speed Adjustment Knob and the Stroke Adjustment Knob at 100%.
  3. Turn The FastPrime™ knob 1 to 2 turns counter-clockwise.
  4. The suction tubing should begin to fill with solution from the tank.
  5. A small amount of solution will begin to discharge out the return line of the FastPrime™ valve. Once this happens, turn the knob clockwise until hand tight and SHUT THE PUMP OFF.
  6. The pump is now primed.
  7. Proceed to output adjustment, Section 4.3.

Start-Up/Priming for Pump Supplied with 4-FV

Series A ManualRead this entire section completely before proceeding.

When all precautionary steps have been taken, the pump is mounted, and the tubing is securely attached, you may now start priming the pump.

  1. Plug in or switch the pump on.
  2. While the pump is running, set the Speed Adjustment Knob and the Stroke Adjustment Knob at 100%.
  3. Open the relief side (black knob) of the 4-FV by turning to the stop (about 1/8 turn).
  4. The suction tubing should begin to fill with solution from the tank.
  5. A small amount of solution will begin to discharge out the return line of the 4-FV. Once this happens, return the knob to the 12:00 position and SHUT THE PUMP OFF.
  6. The pump is now primed.
  7. Proceed to output adjustment, Section 4.3.

Start-Up/Priming Without 4-FV

LMI ManualRead this entire section completely before proceeding.

When all precautionary steps have been taken, the pump is mounted, and the tubing is securely attached, you may prime the pump.

  1. Plug in or switch on the pump.
  2. While the pump is running, set the speed knob and the stroke knob at 100%.
  3. The suction tubing should begin to fill with solution from the tank.
  4. Once the solution begins to exit the pump head on the discharge side, SHUT THE PUMP OFF.
  5. The pump is now primed.
  6. Proceed to output adjustment, Section 4.3.

Output Adjustment

Once the pump has been primed, an appropriate output adjustment MUST be made. Pump output should be calculated and adjustments made accordingly.


Total Pump Output

LMI Series A Calculate the approximate output of the pump as follows:

PUMP OUTPUT = MAX PUMP OUTPUT x % SPEED x % STROKE 

Example: A151-928SI

Use Max Output (from dataplate on side of pump) = 1 GPH (1 gallon per hour).

If the pump is set at 60% speed and 70% stroke length, the approximate pump out- put is:

1.0 x 0.60 x 0.70 = 0.42 GPH.

Multiply by 24 (hours in one day) to calculate in gallons per day. If pump is not equipped with speed adjustment, calculate by Max Pump Output x % Stroke only.


Calibration in Internal Mode

Roytronic Instruction Manual
Click Image to see larger view

Once installation is complete and the approximate output has been determined, the pump should be calibrated to adjust speed and stroke for your actual desired output. (Calibration cylinders may be purchased from your local LMI distributor, ref. publication 1798.)

  1. Be sure the pump is primed, and discharge tubing and Injection Check Valve are installed as they would be in normal service (i.e., including factors such as injection pressure, fluid viscosity, and suction lift).
  2. Place the Foot Valve in a graduated container with a volume of 1000 ml or more.
  3. Plug in and switch pump to Internal Mode. Pump until all the air is exhausted from the suction line and head.
  4. Turn the pump off. Refill graduated container to a level starting point.
  5. Using a stopwatch or timer, turn the pump on for a measured amount of time (120 pump strokes minimum). The longer the time period, the more confident you can be of the results. Be sure to count the number of strokes during the calibration period when making comparisons.
  6. Turn the pump off. Note the time elapsed in relation to volume displaced in the graduate. Now, calculate the output in the time unit you choose (minutes, hours, days, etc.).
  7. If the output is too low or too great, use the Stroke Adjustment Knob and/or the Speed Adjustment Knob to fine-tune the amount of flow, estimating required correction and repeat steps 1-7.

Calibration in External Mode

LMI ManualSince pump output is governed by an external device such as Flowmeter-Pulser, Liquitron™ Controller, or 4-20 mA DC signal from an instrument with an LMI Analog-to-Digital Converter, only the output per stroke may be calibrated.

  1. With pump primed and discharge tubing connected to the injection point as it would be in normal service, place Foot Valve Assembly in a graduated container with a volume of 1000 ml or more.
  2. Switch pump to Internal mode with Speed Adjustment Knob set at 100% until air is exhausted from suction line and pump head.
  3. Switch pump OFF and refill graduate to a starting point.
  4. Switch pump ON and count the number of strokes for exactly one minute, then switch pump OFF.
  5. Note volume pumped during the calibration period of one minute. Divide into this the number of strokes to determine the volume of solution pumped per stroke.

Example: 720 ml in 240 strokes = 3.0 ml per stroke.

Multiply this by your expected stroke rate per minute, per hour or per day and compare with desired output requirements.

7. Turn Stroke Adjustment Knob to your best estimate of required correction and repeat calibration procedure.

Methods of Externally Triggering or Pacing A3, A7, and A8 Pumps

Method of Triggering A3, and A7 Pumps Through External Control Connector

Series A Pump Manual
Click image to see larger diagram

Switch or transistors must be capable of switching 24V DC at 15 milliamperes. Minimum time in low impedance state (ON) is 25 milliseconds. Minimum time in high impedance state (OFF) is 50 milliseconds.

NOTE: Pins 1 (Brown wire) and 2 (White wire) must be connected/ shorted together in order for the pump to be ‘ON’ in external mode.

Series A InstructionsThese pumps have two operating modes: Local (Pulse Indicator Light flashes green) and Remote (Pulse Indicator Light flashes yellow). Pressing the Power/ Mode Selection Button switches between Local and Remote modes. The default configuration for operating mode is Local mode.

When the pump is in Local mode the Remote On/Off input is ignored. When the pump is in Remote mode the Remote On/Off input is always monitored. The pump will return to the last power mode if power is interrupted.

Remote Mode Liquitron
Click Image to Enlarge Diagram

Control Modes

Local Mode

  • When in Local mode the A3 pump runs continuously at maximum speed.
  • When in Local mode A7 and A8 pumps run at the speed indicated by the speed knob.

Remote Mode (for A3, and A7)

Water Cooling TowerPins 1 (brown wire) and 2 (white wire) must be connected/shorted together in order for the pump to respond to pulses in external mode.

  • In Remote mode pulses occurring faster than a rate of 1200 pulses per minute (less than 50ms apart) and pulses with a duration of less than 25ms are ignored.
  • Pulses occurring between 240 strokes per minute (SPM) and 1200 pulses per minute results in the pump running at 240 SPM.
  • Pulses occurring at less than 240 SPM results in the pump stroking at that rate.

Remote Mode (for A8)

Pins 1 (brown wire) and 2 (white wire) must be connected/shorted together in order for the pump to respond to a milliamp signal.

In Remote mode the pump speed is controlled by a milliamp (mA) Analog Input signal. The factory default settings for the Analog Input are: 20mA input = maximum speed, 4 mA = 0 strokes per minute.

In the default settings, the fast level mA input is greater than the slow level mA input. This is known as direct action. In direct action when the mA input is at or above the setting for the fast level, the pump will run at maximum speed. When the mA input is below the setting for the slow level, the pump will stop.

Depressurizing the Discharge Line  (for Pumps Equipped with a 4-FV Only)

ALWAYS wear protective clothing, face shield, safety glasses and gloves when performing any maintenance or replacement on your pump.

To 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.

Read steps 1 and 2 below before proceeding.

1 . Be sure the Injection Check Valve is properly installed and is operating. If a shut off valve has been installed downstream of the Injection Valve, it should be closed.

Be sure your relief tubing is connected to your 4-FV and runs back to your solution drum or tank.

2 . Turn the black knob on the 4-FV 1/8 turn to the stop. Turn and hold the yellow knob for a few seconds. The discharge line is now depressurized. Keep both valve knobs open until solution drains back down the discharge tubing into the solution tank or drum. Then release the yellow knob, and turn the black knob to its normal position.


Depressurizing the Discharge Line  (for Single-Ball FastPrime™ Heads Only)

ALWAYS wear protective clothing, face shield, safety glasses and gloves when performing any maintenance or replacement on your pump.

Read steps 1 and 2 below before proceeding.

1 . Be sure the Injection Check Valve is properly installed and is operating. If a shut off valve has been installed downstream of the Injection Valve, it should be closed.

Be sure your relief tubing is connected to your FastPrime™ valve and runs back to your solution drum or tank.

2 . Turn the FastPrime™ knob one-and-a-half turns counter-clockwise Q. The discharge line is now depressurized. Keep valve open until solution drains back down the discharge tubing into solution drum or tank. Then turn the knob clockwise P to tighten knob to closed position.


Liquifram™ (Diaphragm) Replacement

Precautions Pump OperationALWAYS wear protective clothing, face shield, safety glasses and gloves when working near or performing any maintenance or replacement on your pump. See MSDS information from solution supplier for additional precautions. 

LMI metering pumps are designed for trouble-free operation, yet routine maintenance of elastomeric parts is essential for optimum performance. This involves replacing the Liquifram™, cartridge valves, O-rings, 4-FV cap assemblies and the injection check valve spring. LMI recommends replacing these parts at least once a year; however, frequency will depend on your particular application.

When replacing the Liquifram™, the cartridge valves, or O-rings, the injection check valve spring should also be replaced (see next Section 5.4). A Spare Parts Kit or RPM Pro Pac™ kit containing these parts may be obtained from your local distributor.

Replacing the Liquifram™:

Chemical Pumps US
Click image to enlarge

1 . Carefully depressurize, drain, and disconnect the discharge line (see previous sections in this manual).

2 . Place the Foot Valve into a container of water or other neutralizing solution. Turn the pump on to flush the head assembly. Once the pump head has been flushed, lift the Foot Valve out of the solution and continue to pump air into the pump head until the pump head is purged of water or neutralizing solution.

If the liquid cannot be pumped due to Liquifram™ rupture, carefully disconnect the suction and discharge tubing using protective clothing, gloves and face shield. Remove the four screws and washers from the head and immerse the head in water or other neutralizing solution.

3 .   Start the pump. While running, set the Stroke Adjustment Knob to 0% and turn the pump off.

4 . With the unit off, unscrew the Liquifram™ by carefully grasping the outer edge and turning it counter-clockwise. Discard old Liquifram™. Remove the Adapter Disk (located behind the Liquifram™) and ensure that the diameter of the raised section is the same as the diameter of the replacement Liquifram™.

5 . Remove Adapter Disk and check condition of the Shaft Seal. Replace Shaft Seal if necessary.

6 . Replace the Adapter Disk so that the drain hole of the disk is oriented downward, and the mounting holes line up with the mounting holes of the pump.

Precautions Pump OperationBe careful not to scratch the Teflon® face of the new Liquifram™.

7 . Screw on the new Liquifram™ clockwise until turned all the way in. Start the pump and turn the stroke knob to 100%. Stop the pump.

8 . Remount the pump head using the four (4) screws and washers. Tighten in a criss-cross pattern. After one week of operation, recheck the screws and tighten if necessary.


Cartridge Valve and O-ring Replacement

Precautions Pump OperationALWAYS wear protective clothing, face shield, safety glasses and gloves when working on or performing any maintenance or replacement on your pump. See MSDS information from solution supplier for additional precautions.

1 . Carefully depressurize and disconnect the discharge line (see Section 5.1 or 5.2 in this manual).

2 . Place the Foot Valve into a container of water or other neutralizing solution. Turn the pump on to flush the head assembly. Once the pump has been flushed, lift the Foot Valve out and continue to pump to let air into the pump head until pump is purged of water or neutralizing solution.

If the liquid cannot be pumped due to Liquifram™ rupture, carefully disconnect the suction and discharge tubing using protective clothing, gloves and face shield. Remove the four screws and washers from the head and immerse the head in water or other neutralizing solution.

Spare part replacement kits include specific instructions for valve replacement. Please follow the instructions included with the replacement kit.

3 . Carefully disconnect one tubing connection and fitting at a time, then remove and replace the worn valve and O-rings. If necessary, carefully loosen stuck valves by prying side to side using a small screwdriver through the center hole of the valve.

Before disassembling the check valves, note the orientation of the valve.

4 . Install new check valves in each location. Ensure that the cartridges are oriented correctly.


Injection Check Valve Parts Replacement

Depressurize and drain pipeline (or isolate Injection Check Valve point using valves) so that Injection Check Valve can safely be disassembled.

Precautions Pump OperationALWAYS wear protective clothing, face shield, safety glasses and gloves when working near or performing any maintenance or replacement on your pump. See MSDS information from solution supplier for additional precautions. 

Refer to the LMI Metering Pump Price List for the proper Spare Parts Kit or RPM Pro Pac™ kit number or contact your local LMI stocking distributor.

1 . Isolate Injection Check Valve and depressurize pipe or drain pipeline.

2 . Carefully depressurize and disconnect the discharge line (see Section 5.1 or 5.2 in this manual).

Spare part replacement kits include specific instructions for valve replacement. Please follow the instructions included with the replacement kit.

3 . Carefully disconnect the tubing leading to the Injection Check Valve, then remove the Injection Check Valve Fitting. Remove and replace the worn spring, seat, ball, and O-ring.

Before disassembling the check valve, note the orientation of the parts.

4. Install a new spring, seat, ball, and O-ring. Ensure that the parts are oriented correctly.

LMI Pumps Purchase
Click image to see larger diagram

FastPrime™ Valve O-Ring Replacement

Precautions Pump OperationALWAYS wear protective clothing, face shield, safety glasses and gloves when performing any maintenance or replacement on your pump.

Refer to the LMI Metering Pump Price List for the proper Spare Parts Kit or RPM Pro Pac™ kit number or contact your local LMI stocking distributor.

1 . Be sure the Injection Check Valve is properly installed and is operating. If a shut off valve has been installed downstream of the Injection Valve, it should be closed.

Be sure your relief tubing is connected to your FastPrime™ valve and runs back to your solution drum or tank.

2 . Turn the FastPrime™ Knob one-and-a-half turns counter-clockwise Q. This will depressurize the head. Keep valve open. Carefully remove the return line by gently pulling tubing and moving it from side to side to gradually back tubing off of the barbed fitting.

3 . Hold return line tubing upright until solution drains back into solution drum or tank.

4 . Using a 3/4″ (or 19mm) socket or wrench remove Retaining Nut, and pull out the entire FastPrime™ Valve assembly. Remove and replace the two small O-rings.

5 . Reinsert the FastPrime™ Valve assembly and retighten the Retaining Nut. Then turn the FastPrime™ Knob clockwise to tighten knob to closed position. To avoid damaging the parts, it is important that the flange on the FastPrime™ Valve is flush with the Retaining Nut prior to reassembly.

LMI Pump Maintenance
Click image to see larger diagram

6 . Recut 1 to 2 inches off the tip of the return line and ensure the end is squared. Press the return line tubing on completely past the barbs.

Series A Maintenance
Click image to see larger view

Stroke Length Setting

The Stroke Adjustment Knob is calibrated for each pump, and does not need to be removed during Liquifram™ replacement or during most other maintenance. If the Stroke Knob is removed for any reason it becomes necessary to reset the stroke length. Follow the procedure below to approximate the proper factory setting. If a more accurate setting is required contact your distributor or manufacturer.

1 . Install a new Stroke Shaft. Note that there will be some resistance as the O-ring slides into the control panel. The Stroke Knob can be used to turn the Stroke Shaft. Continue to turn the Stroke Shaft until there is no longer any diaphragm movement. It may be necessary to turn on the pump in order to get the Stroke Knob completely forward; however, care should be taken to ensure that the Stroke Shaft is contacting the Plunger before turning on the unit. Otherwise the pump could be damaged.

2 . Once the Stroke Shaft is completely forward, you can reset the stroke length. Press in the Stroke Knob so that the Stroke Knob Pointer indicates 0 (zero).

3 . Use a Phillips head screwdriver to install the Stroke Knob Screw.

4 . Insert the Stroke Knob Pointer into the Stroke Knob.

LMI Pump Stroke Shaft
Click image to see larger view