The list of frequently asked questions provides a quick answer about common Delavan products. It intents to offer a general overview, and a reference knowledge to check first before needing to contact Technical Support.
My pump does not turn on
- Check for power (Supply voltage +/- 10%)
- Check pressure switch. Please see ESR-008.
- Check relay – It will make a click sound if failed. (FB2/FB3 series demand pump)
- Replace motor
- My pump is not flowing
- My pump is not shutting off or does not build pressure
My pump is turning on and off quickly (Cycling)
- Relieve pressure by adding a return to tank valve or bypass valve.
- Increase the flow in the system with larger or more nozzles.
- Adjust pressure switch. Please see ESR-001.
- My pump leaks
My pump gets very hot
It is recommended to continuously run the pumps at a pressure less than 50 PSI. If the motor is getting hot, typically the pressure is high causing the motor to work harder. Reduce the pressure to 30-40psi.
MODEL STANDARD AVAILABLE OPTION 5800 1/2″ NPT 5900 3/4″ Quick Attach 7800 5/8″ Quick Attach 3/8″ NPT 7800 FLEX 3/4″ Quick Attach 5/8″ Quick Attach (Needs QA Adapter FA-7822FS) 7870/7871 FB 1/2″ NPT 7970 3/4″ Quick Attach
Import vs Domestic Pump
Any pump with an ‘-I’ at the end of the model number is an import pump. The upper housing assembly and valve plater are not replaceable with a standard domestic pump. Pressure switches are interchangeable on all models and so are lower housing assemblies.
Demand vs Bypass
A demand pump shuts off at pressure setting. You can identify a demand pump by the wire leads out of the pump head (pressure switch). A bypass pump runs continuously when it has power. You can identify a bypass pump since they only have 2 wires out of the motor.
Are Delavan diaphraphm pumps self priming? Can they run dry?
Diaphragm pumps self prime and can run dry.
Which models are potable water safe (NSF)?
All models are NSF certified except import and FB3 (7871/7971) series pumps.
- Fuse/Wire Size
Please contact Delavan Techincal Support to discuss your application.
Can I adjust my pressure switch?
Adjusting the pressure switch may increase pump wear and tear which therefore reduces pump life.
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