Circulator pump very hot

holograham

I assume this is not normal. Any thoughts on troubleshooting? My other pump is about 160 degrees (close to water temp). This one is 235+.

EdTheHeaterMan

Air bound? That is a water lubricated pump and the boiler water is inside that section of the pump, but the stator windings are between the water and the green metal case you are measuring the temperature of.

Or the pump is stuck and you are just melting the windings on there.

I'm guessing you have no heat on that zone?

holograham

EdTheHeaterMan said:

Air bound? That is a water lubricated pump and the boiler water is inside that section of the pump, but the stator windings are between the water and the green metal case you are measuring the temperature of.

Or the pump is stuck and you are just melting the windings on there.

I'm guessing you have no heat on that zone?

not sure if air bound - any way to check that?

Yes believe no heat in zone. I turned it off so hopefully stops the circulator running.

hot_rod

Has it been running trouble and noise free recently?
take a pic from back aways. So we can see if there are valves you can use to isolate and purge, or remove the pump for service

holograham

hot_rod said:

Has it been running trouble and noise free recently?
take a pic from back aways. So we can see if there are valves you can use to isolate and purge, or remove the pump for service

Yes running trouble and noise free. I don’t know if it wasn’t heating recently as it had been warm but getting a cold streak now and it’s obviously not working.

 

hot_rod

If every valve in that pic was turned iff you could remove the pump. Do so with the 4 bolts around the motor, 5/16” socket as I recall 

There should be a shutoff directly below the purge valve. Unless Im missing something, I don’t see a way to purge these zones?

holograham

hot_rod said:

If every valve in that pic was turned iff you could remove the pump. Do so with the 4 bolts around the motor, 5/16” socket as I recall 

There should be a shutoff directly below the purge valve. Unless Im missing something, I don’t see a way to purge these zones?

ok thanks. Then what? Replace it? 

hot_rod

The cost of a replacement cartridge may be as much or more than a complete new pump
Shop for a new 007, or comparable replacement

holograham

hot_rod said:

The cost of a replacement cartridge may be as much or more than a complete new pump
Shop for a new 007, or comparable replacement

Thanks!

Joe Mattiello

Take an amp reading to see if the pump is running at or below name plate amps. That will tell what’s going on with pump. Pumps do run hot

HVACNUT

Are these both radiant zones?
Is there a radiant manifold?

If it's radiant, and the other zone is radiant, is it possible the "hot" circulator was replaced in the past with a 007 that was readily available, and not the correct circulator? If both zones have the same flow rates and head, the zone 2 circulator looks like maybe a 0010.
Zone 2 is also putting out 140°. High if radiant. 

holograham

HVACNUT said:

Are these both radiant zones?
Is there a radiant manifold?

If it's radiant, and the other zone is radiant, is it possible the "hot" circulator was replaced in the past with a 007 that was readily available, and not the correct circulator? If both zones have the same flow rates and head, the zone 2 circulator looks like maybe a 0010.
Zone 2 is also putting out 140°. High if radiant. 

Yes zone 2 putting out 140 on purpose - it goes to a room that is very cold so I bumped it up a little since we are going through a cold snap. Will move it down next week when temps go back to 30's (we are getting sustained single digit temps in Northern NJ now).

Steamhead

Maybe the mixing valve under the circ is bad, resulting in no flow to the circ?

holograham

All - appreciate the comments - it turns out the pump was airlocked - fixed that and normal operations resumed!

MarkW66

How did you remove the airlock?

holograham

MarkW66 said:

How did you remove the airlock?

I didnt remove it - my heating guy did the work. He hooked up some tubes to this special looking bucket and had some powered machine. I assume he circulated the water through the system somehow till he got the bubble out.

EdTheHeaterMan

EdTheHeaterMan said:

Air bound? That is a water lubricated pump and the boiler water is inside that section of the pump, but the stator windings are between the water and the green metal case you are measuring the temperature of.

Or the pump is stuck and you are just melting the windings on there.

I'm guessing you have no heat on that zone?

Nailed it!