tankless coil

steve_29

the industry standard is in regards to disconnected tankless coils.

Do you...

just cut pipes and leave in boiler

cap pipes and leave in boiler

cap pipes and put on relief valve

remove coil and install cover plate


I know that thew best solution would be to remove and install new gasket and cover plate...
but what do most of you do?

lchmb

have

I have cut and capped. I Have removed and replaced with cover plate. I Have never installed a relief valve, not sure why you would? If the coil has a pin hole in it and water leaks into it, as long as it can't get out shouldn't hurt anything. I might be wrong, and I'm sure if i am someone will let me know..:) I never leave them open, if it does spring a leak your going to be the first to get the call. (and a new mop)...

Unknown

Good question

Although I have cut the pipes out and left the coil open many times before I knew better , I don't want to assume the liability if the open ports decide to spew out boiler water . If the coil was not leaking internally , we keep the coil connected to the domestic piping and shut off the cold inlet , leaving the hot side live . I've seen the pressure build up so much in a closed coil , it blew out the guts of a boiler drain .

steve_29

I notice you have cut and cap , I would guess that you believe that it's not possible for the coil to build enough pressure to rupture?

The company I work for at this time, has no policy in regards to pressure relief valves being tested during annual services, or tankless coils being disconnected from service.

I'm hoping to establish some kind of standard for us to follow.

thanks

S Milne

I was allways taught

to cut and not cap.

If and when the coil leaks and a small amount of water builds up, could'nt it turn to steam, build preasure and turn itself into a bomb ?

Scott

Unknown

It wouldn't be too hard

to punch or drill a hole inside the coil in the copper to relieve any pressure buildup . I guess you have to be quick and get the plugs in fast or drain the boiler down to do it .

lchmb

never

Never Had that one happen to me Ron, what was the condition's that led up to this? I generally prefer to remove and add a cover plate but can't alway's get people to agree.

Unknown

We capped a coil

on an old steel clunker when we installed a Bock heater . We used a plug on one side of the coil and the boiler drain on the other . There was some water left in the coil . Right before we left we heard a big bang and saw the drain blowing out steam and water , and the gasket was blown out . Scared the crap out of us .

lchmb

usually

Although I have never had that happen, I generally dry out the coil by bringing it to temp and letting it air out if you will. I'll have to keep that in mind thanks...

todd s

you could

remove the coil, break it off and re-install as a plate with 2 plugs in it.