Отзывы о Поверхностный насос Grundfos JP 5-48 (1490 Вт)
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Grundfos JP 5-48 (1490 Вт)?
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It ran though.. for a couple weeks. I'm not sure if it was defective or not.
I just shorted out (self destructed).






So far I am very happy with the pump. I'm using it to circulate hot water from my hot water heater through a radiator to heat a room and back to the hot water heater. I originally built the system with a cheaper pump from a different manufacture however that pump failed after only a few years. With the original system, the pump was not run six months out of the year. That probably allowed mineral deposits to clog the pump. So with this pump, I plan to run it on a timer a few minutes every day even in the warm weather.
This pump is a "cartridge" style pump. The windings are fixed and apply magnetic fields through a thin stainless steel housing which serves as the water tight seal to the permanent magnet rotor assembly. The advantages of this design is that there isn't a shaft protruding through a water tight seal which would eventually wear out. Also water is in contact with everything that moves so it both lubricates and cools the moving parts.

You'll need to wire the new pump. I just used my old wiring, the green wire to ground, the two white wires to L and N. (In my case, since I had two white wires, I had to trace them back to the plug to learn which was connected to the narrow [=L] prong of the plug and which to the wide [=N] prong.)
Note: my pump was NOT labelled 59896775. It has another model number written on it, despite it being described as part 59896775 by Amazon. I called Grundfos and was told the differing number was due to it coming with the fittings as a kit. I find that hard to believe, but I can confirm the pump is working properly.
Oh, and finally, bleed air from the pump by using a very wide flathead screwdriver to loosen (not remove) the metal cap in the center of the front of the pump. Water will leak out. When it does and no bubbles are coming out, you should be good to go.

Oh, and while you're at it, once you have it installed and have turned the water back on after making all connections, and thereafter starting the pump, be sure to turn the central nickel-plated screw in the central shaft area to a loosened position to purge any air from the pump while it's running. DON'T remove the screw, just loosen it while the pump is running and let any air (and a little bit of water which will dribble out) escape. Once you have only water slightly escaping from that area retighten the screw and everything's Jake! This is easier to google (found it on another seller's website).
The pump may sound a little noisy at first, but after the ceramic bearings have seated in the first minute or so and after you've purged the air in the pump (described in preceding paragraph) the noise should go away and it should be relatively silent. Very nice.


