Help with grundfos up26/99f pump

karter

Ok guys.i had a locked pump pulled it apart and had a spair replacment cartridge. I installed .now shure if pump ran.but pump body getting very hot.would a bad capacitor do this.also on cartridge box says 115v/230v how can it be both my pump is 115v. Shut it off bypassed it for now.very cold here now 9deg.

neilc

how hot is your boiler water?

that's a wet rotor, and will be as hot as the water, and pipes around it,

are the baseboards / floors / airhandlers hot? keeping you comfortable?

karter

Pump way hotter than pipe going into it.so hot cant touch will burn ya.

karter

Think it kicked out they have a high temp kickoff I think.when it gets cooled down going to pull end and see if its locked up.dont want to get to crazy with temps so cold.

neilc

I missed the voltages and capacitor, and from here I don't know, could be capacitor

karter

Ordered a capacitor on ebay.didnot see its coming from kiev.been 2 weeks .prob will not get it never do that again

hot_rod

Do you mean a new motor? The cartridge inside would not have a voltage rating

It could be locked or air bound causing a high temperature

Some models have a big slotted screw on the back of the motor. Remove that to see if it is spinning, or let air out

GroundUp

Probably got airlocked when you replaced it and then overheated due to lack of flow. This is a very common issue with DIYers

karter

No I black flushed for air with hose.till clear

karter

Can I open the back of pump with screwwoth water going in or do I shut top and btm valves.i downloaded the app for my ph to check if motor was running was turning very slow.put ph on my ser100 pump they showed twice speed

hot_rod

That 26-99 is not a replacement for a series 100?

If you have one, the screw look like this.It can be removed without isolating the pump.

There may be a spray of water, or steam if the pump has over-heated. Remove with caution.

With this cap remover you see the end of the motor shaft. It is a ceramic shaft, so don't jam it with a screwdriver. It should spin when powered up.

Screenshot 2025-01-06 at 8.39.53 AM.png

karter

Thanks it was there when I bought house.what is the mod number for a replacement for the ser100 115v pump just would like to know have 2 of them and 1 of the 26/99s bet they replaced in a hurry sometime with it.

hot_rod

Grundfos 15- 58, Alpha 15-58 if you want high efficiency

Taco 007 or 007E electronic.

I just bought a 15-58 on Ebay for 45 bucks, included shipping