One low pressure fault after 6 hour rest

It is one single loop, 1.5" so all the flow goes through that single loop, not multiple loops....The flow was stable before the lockout. When you saw some indicated flow fluctuations after it was restarted, then the heat pump was running stable. Plus if you would have air bubbles as severe as causing heat pump shut off, you would see power fluctuations. Power consumption is very stable during that time and indicative of the loop slowly lowering the EWT, nothing else.

 

Bubbles.

Pressure fluctuations.

I never said anything about indications.

Power?

What would I see if an air blob locked out the system on a low temp fault? Nothing on the power side as all motion stopped.

My guess is this is piped backwards and it has a vacuum leak.

Tell me why that could not be the situation.

Mark

 

I did say indications. The graphs indicate something but it does not have to be real. Inline flow meters with electronic output are notorious for signal fluctuations. But you would see power fluctuations before the system shuts down.

You would see some short term power spike right before lockout.

Ingram sells flow centers for DIY, the pump is already assembled, and only pumps in one direction. Besides, it is impossible to pump through the flow center in the wrong direction since you would pressurize it and water would be pushed out of the cap. It is not sealed tight. Thus it would not run permanently.

 

Mark,
I need a Normally Closed 140-20F Clip on bimetallic switch for my Trane Desuperheater loop temperature control scheme.
Trane built my Desuperheater loop control scheme per a schematic that showed the Outlet temperature switch Normally Open. The recirc pump rarely runs.
Carrier used two Normally Closed temperature switches for their control scheme in the 3 Ton Unit that I installed, which allows the pump to run when the compressor starts. I would prefer moving heat anytime the compressor is running when in the cooling mode. I pull the fuse on the recirc pump during the heating season.

I'll take a picture of the bimetallic that I removed and bypassed for now, if you need to see it.
Thanks Mark. Ron

 

And this has to do what? in relation to a 2 year old post????

 

Doc:

Why do you care what he wants/needs. Are you being fremoshaemen?

 

I assume you mean "fremdschämen". I don't really care. But use a private messaging or a new thread.

But our friend Ron here starts a respond to a thread which is 2 years dead, then is completely off (in my humble opinion, although I admit this is debatable) about what is the issue here, and then starts to inquire to you about "Normally Closed 140-20F Clip on bimetallic switch for my Trane Desuperheater loop temperature control scheme".

I am sure you can help him out....

 

Hmmm I didn't notice this thread then, but my bet is it's a little short looped and goes into a temp lock out due to the lengthy run after the ill advised set back. If OP is still out there, heat pumps don't "rest".