The mano is the small indicator, discreet, so discreet that you never look at it. They say it never worked. And that we don’t have to change it because we think it’s useless… The pressure gauge is the hydraulic pressure gauge (in bars or grams) located on the filter or on the multi-way valve . In any case it is between the pump and the filter media (sand, diatoms, cartridge…). It indicates the clogging of the filter and helps to ensure the proper functioning of the filtration.
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It is indispensable! It tells you how your filtration system is going. At a glance at the pressure gauge you know, for example, whether your pump sucks properly, if your filter is clogged, if there is air in the circuit or if the skimmers baskets are clogged. It’s kind of like a light bulb Service life is limited, it is a wear part. It does not withstand too much water strokes and frost. Its cost is derisory in relation to its usefulness. (between 5€ and 20€)
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Plan de l'article
- What is the normal filtration pressure?
- Problems with display on the pressure gauge
- To replace your pressure gauge, it’s very simple.
What is the normal filtration pressure?
There is no so-called “normal” pressure. Just a clean filter pressure is your reference value. You see this pressure on the first commissioning or after a good wash (make a reference in this place). As the filtration cycles are completed, the pool filter will stop impurities. The pressure will gradually increase. When it has increased from 300 to 400 grams, it will be time to carry out a counter wash. It is not necessary to do a wash if the pressure in the filter has not increased. It would be uninteresting and then you need to know that it is when the filter is dirty that it filters the finest.
NB: Before you start searching for a problem, check that the needle of your pressure gauge goes back to O when your filtration is stopped. If it stays above O, you can change it or do a small calculation to know the real pressure.
Problems with display on the pressure gauge
If your filter is overpressure (too high pressure)
— Your filter is dirty, the sand is clogged.
— Something blocks the flow of water.
— Your pressure gauge is broken.
Your filter is under pressure (low pressure)
— The skimmers baskets are full.
— The pre-filter basket of the pump is clogged.
— The water level in the pool is too low.
— The pressure gauge is defective.
— The turbine is stuffed with dirt.
— Valve closed to suction (skimmer, bottom drain, broom plug)
— There is an air intake at the suction…
To replace your pressure gauge, it’s very simple.
Dismantling the pressure gauge
— First stop the filtration of your pool. Lower the circuit breaker to turn off electricity and put the installation safe. Or press the 3-position button (Off/Auto/Manu) and switch it to Off (this is the middle position).
— Close Suction and discharge valves so as to isolate the mano and prevent the pump from defuse. You can take a picture of them to be sure to put them back in their original position.
— Unscrew the pressure gauge counterclockwise.
There are 2 different threads. If you doubt, now that it is disassembled and the water circuit is closed, you can quietly go to your favorite pool with the model.
To reassemble the pressure gauge, 2 solutions.
— Either there is a small O-ring to put around the net of the mano.
— Either you need to add Teflon to make a waterproofing. Teflon tape is extremely simple. It is applied tightly on the male thread (i.e. the one of pressure gauge), and clockwise when holding the fitting facing you. The thickness is variable depending on the connection but generally 2 or 3 turns are not enough. To ensure good tightness, you should no longer see the reliefs of the manometer nets.
There are several widths for Teflon, in our case the smallest does the trick widely.
Caution: with Teflon it is impossible to make an adjustment by unscrewing the elements. Any disassembly requires redoing a Teflon application after carefully removing the remnants of the previous seal.
— To finish, all you have to do is screw the mano back to its location, and then open the valves you have taken as a photo.