Nov 02, 2018 - 10:42 AM
The RV water pump is an on demand system. This means that the pump only kicks on when it's needed. They work by pressurizing your water pipes to a preset PSI (pounds per square inch). This is usually about 30 PSI but most pumps are adjustable. When the power is switched on to the pump, it starts pumping. If any faucets are open, the pump continues to run providing the necessary flow of water. When you shut the faucet off, the pump continues to run until the preset water pressure is built up in the plumbing lines. When this pressure is reached, the pump automatically turns off. These pressure in the line is maintained until you open a faucet again. When you open the faucet, the pump senses a drop in pressure and begins pumping again. So there would not be a need for a controller.
Some older RV water pumps work differently. You have to manually turn the pump on when you want water. You open the faucet, turn the pump on and water flows out of the faucet. When you want to turn the water off, you turn the switch off to the pump and then close the faucet. It's important to do things in this order. These older pumps don't shut off when the water reaches a preset pressure in the line. Leaving the pump running will either overheat the pump or burst a plumbing line. In this case, hooking up a controller for your water pump would be an easier way of turning the pump on and off.