Pentair VSF and Ultratemp heater shut off at same time

[Lbem25]

Have a new heat pump and pump install. Each wired separate into separate breakers. When I turn on the heater, it instantly kicks off the pool pump and then within a second, the heat pump errors on low water flow. I have clean baskets, backwashed filter, high water levels. Pentair says they have never seen it but maybe an electrical
Issue or drive issue on the pump. It has run for 8 hours before and works well but other than that, will not start up 95% of the time. Power stays on to everything and the pump will kick back on after 3 seconds and the heat pump goes into restart mode. Thoughts?

 

[BMerrill]

Pick me! I'll guess.
The surge current draw when the heat pumps compressor starts is lowering the voltage to the filter pump substantially outside its voltage/amp operating range briefly activating the self-protection; ie shutting itself off. Never a good thing.
Installing a soft starter on heat pump should resolve your issue.
An underlying problem may be a wire sizing issue vs the length of wire vs combined amp draw within the common panel box.

 

[JamesW]

Check the pump error log to see if it has undervoltage errors.

 

[Lbem25]

Pick me! I'll guess.
The surge current draw when the heat pumps compressor starts is lowering the voltage to the filter pump substantially outside its voltate/amp operating range briefly activating the self-protection; shutting itself off. Never a good thing.
Installing a soft starter on heat pump should resolve your issue.
An underlying problem may be a wire sizing issue vs the length of wire vs combined amp draw within the common panel box.

Thank you. Makes a lot of sense.

 

[JamesW]

Check the voltage going to the pump to see how much voltage drop there is.

Maybe the wiring is too small?

 

[Lbem25]

Check the pump error log to see if it has undervoltage errors.

I have checked on my app and no alerts outside of the pump being offline. Unless there is another place to pull them from.

 

[Lbem25]

Check the voltage going to the pump to see how much voltage drop there is.

Maybe the wiring is too small?

Will do.

 

[JamesW]

What exact pump do you have?

Model and part number?

 

[Lbem25]

What exact pump do you have?

Model and part number?

Ultra temp 120Q heat pump
Intelliflo 3 VSF 3hp

 

[JamesW]

https://www.pentair.com/content/dam/extranet/nam/pentair-pool/residential/pumps/archive/intelliflo-vsf/intelliflo-vsf-om-eng.pdf

https://www.pentair.com/content/dam/extranet/nam/pentair-pool/residential/pumps/intelliflo3-vsf/manuals/user's-guide/intelliflo3-pro3-vsf-users%20guide.pdf

https://www.pentair.com/content/dam/extranet/nam/pentair-pool/residential/pumps/intelliflo3-vsf/manuals/install-guide/intelliflo3-pro3-vsf-install-guide.pdf

 

[JamesW]

 

[Lbem25]

View attachment 493137

That’s exactly what happens. Red light comes on and green yellow blinking.

 

[JamesW]

Does it say undervoltage anywhere?

 

[JamesW]

Can you describe the wiring to everything?

 

[Lbem25]

Does it say undervoltage anywhere?

Nope not on my app. No touch screen on mine.

 

[Lbem25]

Can you describe the wiring to everything?

 

[Lbem25]

View attachment 493162View attachment 493163

 

[Lbem25]

View attachment 493166

 

[Lbem25]

Since I am not getting any low voltage errors, could just be high starting amps? Maybe bad compressor adding to that?

 

[JamesW]

What breaker feeds this subpanel?

How far is it from the main panel to this subpanel?

What is the wire size from the main panel to this subpanel?

What is the wire type?

Did you watch the voltage before anything turns on and then when heat pump turns on?