radiators have a mind of their own

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Old 11-03-13, 12:39 PM
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radiators have a mind of their own

When my fiance and I moved it,
we put down a new kitchen floor which necessitated removing a radiator.
Bled the system, floor when down, everything just peachy.

Fast forward a few months:
refilled the system, turned on the heat,
and now my radiators have been alternating who gets to be hot.

It's a 2 pipe system, which seems to have 2 loops:
one for the front of the house, one for the back (pretty much).
First the back loop was hot, then the front loop. They liked to change days.
It's been about a week with the heat on now,
and I can count on 1 radiator in particular always being hot.
But it's the only one I can count on out of the 13.
There are 2 others that I can count on for being warm.

Now if I jack up the heat to 65,
some radiators will get near warm,
others stay cold.

I have bled the radiators each a half dozen times.
I don't know what else to do.
I have my furnace schedule to be cleaned and tuned,
but I don't think these issues really reflect something that will be fixed by that.
Maybe I'm wrong, hopefully.

Any tips greatly appreciated.

Other info that may be useful:
house is crazy old (circa 1800),
has been unoccupied the last 10 years -
though the service tag on the boiler states its been serviced regularly.
 
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Old 11-03-13, 02:36 PM
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Are these large cast iron radiators? So you have bled each and have gotten water from them? How about the control valves? Are they open on all of the radiators? Jack up to 65? You keep it that cold?

It sounds like an air issue. Is this a monoflo system?

I almost forgot. What is the pressure of your system and at what temperature? How many floors is your house?
 
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Old 11-03-13, 04:11 PM
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Is this a monoflo system?
You can determine this by looking at the way the radiators are piped, and examining any TEE fittings closely.

If you have Monoflo(tm) (aka diverter tees), both the supply and return to and from each rad will come off the SAME PIPE.

One or both of the TEE fittings will be 'special'. Look closely, there will be a directional arrow (or arrows) on the tee fittings... or a 'red ring' around one end... or... some way of identifying them as monoflo.
 
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Old 11-03-13, 05:09 PM
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Yeah, these are big old cast iron radiators, and they have been bled a bunch.
I keep thinking it's an air issue so I keep doing it, but every time I only get water.
Control valves, all are open - except some just keep spinning.

And yeah, house is usually at 55*ish

2 story house plus basement.
Temp is between 180-190 and pressure is 10.

I most definitely have 2 separate pipes for each loop.

If pictures can help, let me know.
 
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Old 11-03-13, 05:35 PM
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all are open - except some just keep spinning.
Need to see pics... what kind of valve...

pressure is 10.
If your gauge is accurate, that's the biggest part of your problem.

Read this:

http://www.doityourself.com/forum/bo...ure-gauge.html

And later you will probably need this:

http://www.doityourself.com/forum/bo...sion-tank.html
 
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Old 11-03-13, 07:33 PM
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Your pressure should be a minimum of 12 psi when the boiler is cool.
 
 

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