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Models 31820-Series 31821-Series

Models 31820-Series 31821-Series
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Models 31820-Series 31821-Series INDUSTRIAL DIAPHRAGM PUMPS Commercial Duty, 3 GPM/12 LPM • • • • • • • • Easy Installation • Flow to 3 GPM/12 LPM Sealless • Low Amp Draw Run Dry Ability • Compact Size Self-Priming • Quiet Running Thermal Overload Protected Motor Corrosion Protected Motor Snap-in 1/2" (13 mm) Dia. Port Adaptors Conforms to Electromagnetic Compatibility 89/336/EEC and Machinery Directive 89/392/EEC, EN50081-1 SPECIFICATIONS Pump Body: Elastomers: Hardware: Pump Design: Suction Lift: Glass Filled Polypropylene Santoprene** Diaphragm, Valves of Viton* Stainless Steel Multi-Chamber Diaphragm Self-Priming to 10 ft (3 m) (wet) 5 ft (1.5 m) (dry) min. Duty Cycle: Continuous, Maximum 40 psi (2.8 bar) at Ambient of 130° F (54.4° C) Ports: 1/2" (13 mm) Hose Barb and 1/2" (13 mm) Straight Pipe Thread Motor: Permanent Magnet with Thermal Overload Protection Temperature: Liquid temperature range is 45°F (7°C) to 130°F (54.4°C) Viscosity: 250 centipoise maximum Shipping Weight: 7 lb (3.2 kg) approx. (12/24 V models) Road Rollers Parts Washing Spray Equipment Construction Equipment Washdown APPLICATIONS This pump provides excellent service in the following applications. CONSTRUCTION: Water supply pump to the spray bars of road rollers and other compaction equipment, street sweepers, and truck mounted dust control systems. AGRICULTURAL: Supply pump for herbicide and pesticide spraying equipment. INDUSTRIAL: Fluid transfer applications for mild acids and bases. Chemical feed pump. Washing fluid supply pump in parts washing systems. Machine coolant pump. Concrete saw lubricant supply pump. Recirculating pump in filtering systems. Models Protective Coated Motor NOTE: Viton equipped models are not suitable for potable water applications. Pressure Switch Settings Nominal psi (bar) Cut-In Cut-Out Recommended Fuse/Breaker Sizes * Viton is a registered trademark of DuPont Dow Elastomers L.L.C. ** Santoprene is a registered trademark of Monsanto.

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OPERATING INSTRUCTIONS WARNING Explosion hazard. Do not pump gasoline or other flammable liquids. T do so can cause o an explosion resulting in injury or death. Fire hazard. Wiring must comply with applicable electrical standards and include a properly sized fuse or circuit breaker. Improper wiring can cause a fire resulting in injury or death. The electrical circuit should be protected with an overcurrent protection device in the positive lead. See chart for proper size. The pump circuit should not include any other electrical loads. Black Wire from the motor is negative, orange is...

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SERVICE INSTRUCTIONS PUMP DISASSEMBLY 1. Remove power from pump. Open discharge valve to relieve system pressure. Check that ferrules are installed in upper housing and O-ring is properly seated. Install check valve assembly in upper housing and fit upper and lower housings together. Push port clips back and disconnect plumbing from pump. 10. Align pumphead with motor and tighten four (4) screws evenly using 25 inch pounds (2.8 Nm) of torque. Remove the four (4) pumphead screws. Rotate pumphead until cam/bearing set screw is visible through drain notch. SWITCH REPLACEMENT 1. Remove power...

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DIMENSIONS Inches (millimetres) TROUBLESHOOTING PERFORMANCE CURVES 70 (4) FAILURE TO PRIME – MOTOR OPERATES, BUT NO PUMP DISCHARGE • Restricted intake or discharge line. • Air leak in intake line. • Punctured pump diaphragm. • Debris under flapper valves. • Crack in pump housing. MOTOR FAILS TO TURN ON PULSATING FLOW – PUMP CYCLES ON AND OFF • Restricted pump delivery. Check discharge lines, fittings and valves for undersizing or clogging. Pressure Amps Loose wiring connection. Pump circuit has no power. Blown fuse/Thermal Protector Tripped. Pressure switch failure. Defective motor. PUMP...

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