New Navien NCB-240 without Heating loop temporarily

cybersurfr

Hello All,

I have a need to run a combi-boiler temporarily without space heating. Just due to time factors. (we have a furnace, so space heating is a second priority). Navien sent this to me and it seems simple enough, but I am looking for some commentary from those who maybe have done this before. In creating the primary loop this way.

Would someone be as kind to explain the highlighted components?

EBEBRATT-Ed

S is heating system supply from boiler

R is heating system return to boiler

Your heating loop (the 6" Min & 12" Max) has a supply valve, return valve, a purge valve an expansion tank and an air separator.

H domestic hot water out of the boiler

G is gas supply to boiler

C cold water into boiler for domestic hot water

The other two pipes are city water make up for the boiler loop & condensate drain

This should all be in the manual

Are you trying to install this your self??

cybersurfr

I will not be installing it myself, my plumber will. However I have had horrid luck with plumbers doing all mannerisms of things. So I am trying to establish what to look for to ensure the Job was done 100% correctly.

EBEBRATT-Ed

@cybersurfr

I would download the manual for the boiler to be installed and make sure the plumber follows the piping diagram among other things.