Navien Circulator Pump Grounding

[DIYorBust]

When using a navien boiler, the boiler's board has internal relays and terminals to connect several 120v pumps. However I couldn't find a spot on the board to connect the pump ground wire. How is this normally handled, is there a ground screw in the boiler somewhere? The boiler itself has a 3 prong plug and is grounded. I think it would make sense that the pump should also be grounded since it is a metal object. Has anyone done this before? Thanks!

 

[John Gayewski]

When using a navien boiler, the boiler's board has internal relays and terminals to connect several 120v pumps. However I couldn't find a spot on the board to connect the pump ground wire. How is this normally handled, is there a ground screw in the boiler somewhere? The boiler itself has a 3 prong plug and is grounded. I think it would make sense that the pump should also be grounded since it is a metal object. Has anyone done this before? Thanks!

There is a ground bar in there if i remember right. Take a picture. I wired one a while ago and thought it was really logical. I'm actually about to install another in my house.

 

[Sponsor]

 

[DIYorBust]

Thanks man here is a photo from the brochure showing the interior of the navien. I circled in red where the 120v relay terminals are for the pump. Below is a closeup of the board. What do you think?

 

[John Gayewski]

Hmmm... either I'm wrong and remember incorrectly and i pulled the ground wire out of the rat rope i used, or the internals have changed. I thought the circulator wiring was higher up on the right side. My old phone with all of my pictures got ruined too, so i don't have my go to memory bank.

If there truly is no ground bar inside of there you can wire nut them together with a pigtail and use one of the screws for the body somewhere or a self tapper.

 

[DIYorBust]

From the manual below: so if you can hard wire it, there must be a spot where the factory-installed cord connects to a terminal in the boiler, that would seem like a good place to make the pigtail. I'll have to look to see where that is because you can't see it in the photo. Another though I had was to use type AC cable instead of MC and put the strain relief connector in one of the holes in the bottom of the boiler, but I'd need to see if the pump can accept a mechanical ground. Would need to scrap some paint off the boiler case to make sure it was a good connection with the locknut. I didn't want to tie into some random screw which might not be grounded, or might need to be at a certain torque, and the case metal is too thin to tap for a good ground. I mean will it work? Yeah probably, but in an ideal world I'd like to ground it in a way intended by the manufacturer if possible.

 

[Fitter30]

Follow the power cord green wire has to go to chassis.

 

[John Gayewski]

I'm going to take a picture of the inside of the navien nhb150 I'm wiring now. There is a ground bar.

 

[John Gayewski]

 

[John Gayewski]

 

[John Gayewski]

I'm not sure what boiler you have but the ones i install have a ground bar right up front.