Extend2wash,FAQ window cleaning

You can run a pump on the pressure switch and operate without a controller.

This may work for you but it does not work for everybody for a number of reasons:

1. In running the pump until it hits the pressure switch you are running the pump as hard as it can possibly work. This means that the pressure in the system will be at its absolute maximum. This puts strain on the hoses, on the fittings and on the pump. It therefore increases the chances of split hoses, leaking joints and increases wear on your pump, shortening its life.

2. As the pressure switch cuts out the pump is at maximum, working as hard as it possibly can and therefore drawing maximum current from the battery. Hence as the switch opens it is under great strain. The high current and the fact that the pump is an inductive load (with stored energy) means that the pressure switch contacts are likely to arc and eventually they will fail.

3. Without a controller the pump will not stop until it hits the pressure switch. With a controller with dead end detection properly calibrated, the pump will be stopped a long time before this high pressure and high pump load is reached. This means that because the pump is turned off earlier you are saving battery energy, thus increasing both the battery life and the amount of time you can work on a battery charge.

4. Without any type of flow constrictor the water will be at full flow. Good for putting out fires, but not so good for cleaning windows. The aim should be to work with only sufficient water to get a good clean. This is a benefit because the aim is to conserve the water in order to increase the amount of work possible from a tank. You also save time because you don't have to make as much pure water and you save resin as well. Working with large amounts of water can also cause a hazard for those around you, especially in cold conditions.

5. The faster and longer the pump is running the hotter it will get. As the heat in the motor increases it will lose efficiency meaning some of the current drawn form the Battery is waster generating heat instead of turning the motor. The knock on effect heer is water flow will drop slightly even though you are drawing the maximum current the pump is rated for.

A controller will help you work more efficiently - cover more work in the same time - create the opportunity to do extra work each day - reduce how often you are changing RO and DI filters so saving you money.

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Why use a pump controller

What's the difference between the various types of resin? I see anion, cation, mixed bed and so on.	There are two general types of ion exchange resins: those that exchange positive ions, called cation resins, and those that exchange negative ions, called anion resins. A cation is an ion with a positive charge. Common cations include Ca , Mg , Fe , and H . A cation resin is one that exchanges positive ions. An anion is an ion with a negative charge. Common anions include Cl , SO , and OH . An anion resin is one that exchanges negative ions. Mixed bed resin is a mixture of cation and anion resins in a specific volume ratio depending on their specific gravities. The ratio is normally 2 parts cation resin to 3 parts anion resin for window cleaning. Suitable makes and types are Tulsion MB111, Tulsion MB115, Purolite MB400, Cedelite and Dowex. Virgin resin is generally better but costs more. Back to consumables

back to Extend2wash window cleaning equipment Why use a pump controller You can run a pump on the pressure switch and operate without a controller. This may work for you but it does not work for everybody for a number of reasons: 1. In running the pump until it hits the pressure switch you are running the pump as hard as it can possibly work. This means that the pressure in the system will be at its absolute maximum. This puts strain on the hoses, on the fittings and on the pump. It therefore increases the chances of split hoses, leaking joints and increases wear on your pump, shortening its life. 2. As the pressure switch cuts out the pump is at maximum, working as hard as it possibly can and therefore drawing maximum current from the battery. Hence as the switch opens it is under great strain. The high current and the fact that the pump is an inductive load (with stored energy) means that the pressure switch contacts are likely to arc and eventually they will fail. 3. Without a controller the pump will not stop until it hits the pressure switch. With a controller with dead end detection properly calibrated, the pump will be stopped a long time before this high pressure and high pump load is reached. This means that because the pump is turned off earlier you are saving battery energy, thus increasing both the battery life and the amount of time you can work on a battery charge. 4. Without any type of flow constrictor the water will be at full flow. Good for putting out fires, but not so good for cleaning windows. The aim should be to work with only sufficient water to get a good clean. This is a benefit because the aim is to conserve the water in order to increase the amount of work possible from a tank. You also save time because you don't have to make as much pure water and you save resin as well. Working with large amounts of water can also cause a hazard for those around you, especially in cold conditions. 5. The faster and longer the pump is running the hotter it will get. As the heat in the motor increases it will lose efficiency meaning some of the current drawn form the Battery is waster generating heat instead of turning the motor. The knock on effect heer is water flow will drop slightly even though you are drawing the maximum current the pump is rated for. A controller will help you work more efficiently - cover more work in the same time - create the opportunity to do extra work each day - reduce how often you are changing RO and DI filters so saving you money. back to Extend2wash window cleaning equipment