Adding manifold help needed

FYI you only have one zone, and the person who installed this did a poor job (piped wrong) but it should still work to some extent. What seems to be the actual problem? Also where in MN are you located?

@Hleight7, The circulator next to the boiler is pumping into the expansion tank. No good. Move the circulator to the return.

Someone's attempt at injection pumping, but wrong. It needs to be closely spaced Tee's here.

Closing the ball valve might help, but then you've got 2 circulators running in series. There's also an internal boiler circulator, so they might not all play nice together that way. How far away is the radiant manifold that an injection loop is needed?

I also don't see an external Pressure Reducing Valve, and it looks like the port for the internal Pressure Reducing Valve is capped. So where do you add water to the boiler?

You have one two many circulators :)

Your boiler, a combi has one circ inside. These pics show an external boiler circ.

It looks like the factory P/S header pipe under the boiler, that stainless steel pipe. If so this piping is what works, just the a single pump version off that header. This pic happens to be a multi zoned pump system.

Or a U shaped version, lower pic

This shows closely spaced tees where you have a header pipe

A fairly easy piping fix.

A discharge pipe to the floor from this relief valve, please. as @psb75 mentioned

   That is why you should post his number here or PM me the number.  When he gets a call from someone else on your behalf, or several from all over the country, (the internet is funny that way) you will get action.  If you paid $$$ for the heater repair already, and it does not work, you should get a refund.   Or the contractor should make the heat work!!!!   That is the way it should be.  Otherwise that person should be charged with fraud!!!  That is what the courts are for.   No one that is that busy has time to show up in court for this nonsense.  

If my phone call to them does not get results, then file a claim in small claims court… that will get his attention. 

I just got off the phone with the Warwas heating and cooling owner.  It appears that you purchased a new Nevian Combi and it is operating as expected.  Some of the space heating loops are operating. However, the radiant floor heating loops are not properly installed.  From what I have heard from the installing contractor, the previous owner of your home installed the tubing himself.  He used a non-oxygen barrier ¾” PEX tubing, and there is no way to determine where each loop goes or how long each loop is.   As a result of all his efforts the contractor has determined that there is no way to make that floor heat operational.  He sounds knowledgeable and I believe him at this point.   

If I were in your situation, purchasing a home that did not have an operational heating system I would check with a real estate lawyer to see what your options are regarding this situation.  I don't really see how the contractor (or any contractor) could do anything to make that tubing operational for you. 

Second, now that you own a home without an operational heating system the easiest way to make that new boiler heat your home is to install 2 zones of Copper tube Alum fin baseboard in that home.  The heater is large enough to heat your home if you have the proper heat emitters.  This would mean abandoning the floor heat system completely.   I hope this helps you to understand what you have gotten yourself into.  

Good Luck in getting your home properly heated. 

Mr. Ed

PS. I will be in contact with Warwas with more details as to how you can get the heater operational in the next few days. He really wants to help however the work performed to date is completed and you have working domestic hot water and some working central heat. But you need a heating system that will accept all the heat the boiler can deliver. it appears that you currently do not have that.

@Hleight7 said: "We bought the house which had UFH and its about 20 years. But funny the previous owner they didnt try to turn it on so when we moved in, found out so many missing parts to make it works.Got contractor came in and installed parts but funny he disappeared"

What @Hleight7 really means: We bought the house which had UFH installed by the previous owner DIY and it was never operated properly and its about 20 years. But funny the previous owner they didn't try to turn it on so when we moved in, found out so many missing parts, like the actual heater was a Gas Automatic standing pilot water heater to make it works.  Got contractor came in and installed parts (abandoned the water heater and installed a Nevian Combi Boiler. After the previous owner was asked by Warwas the contractor how the tubing was designed, the contractor determined that the radiant floor tubing was inoperable. So he suggested more work to get the heat to operate and he is waiting for approval of the additional work and how it will be paid for. but funny he disappeared. 

I sent you a private message.

Panel radiators will be a better system however it will me more expensive than baseboard.