Hot water radiator(s) don't heat properly

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Old 11-15-12, 09:06 PM
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Hot water radiator(s) don't heat properly

Hi,
I have a two unit rental property with forced hot water heating. Each unit has its own boiler.

It seems that 2 of the 4 radiators on the 2nd floor are not heating up properly or are heating erratically. I was just at the apartment and the temperature throughout was fine and as set by the thermostat.

I bled the rads - no air.

The two boilers were serviced last year.

Any thoughts. - wondering about the valves.

Nick
 
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Old 11-15-12, 09:26 PM
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Which valves were you wondering about ? Normally on a hot water heating system there aren't valves on the radiators.
 
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Old 11-15-12, 09:29 PM
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It would most certainly seem like air. You would tell by how the system is piped.

If piped in a loop , if the first rads are hot the others would be also. I would say it may be a mono flo tee set up?

Possibly also since its the second floor the PSI in the boiler could be low.

Last it could be a split loop also with a common return.


What is the PSI and temp say on the boiler gauge? How does the air elimation device look on the boiler?

What is the make and model of the boiler?


Take pics.... Or you can always call your service guy....
 
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Old 11-15-12, 09:30 PM
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The valve - if that is the correct term- to regulate the water inflow to each radiator.
 
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Old 11-15-12, 09:47 PM
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Those valves should be left open. Possibly one was broke? Does the valve just turn and turn and not stop open or closed?
 
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Old 11-16-12, 09:55 AM
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Thanks for the replies.
Both boilers are Crown Boiler Model ABF 105 PPD

The PSI and temp on the 2nd floor boiler are 20 psi and 180 degree (1st floor is about 10 psi)
The valve on one of the 2nd floor rads did spin, but I think it stopped. I'll check. Wondering if the shaft broke in the "off" position.

Also, I noticed that there is a drip from the pipe connected to the pressure release valve on the 1st floor boiler. I releleased the valve and let out a bucket of water, but it still drips.

Thanks,
Nick
 
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Old 11-16-12, 03:55 PM
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Hi Nick,

Please read both of the following posts:

http://www.doityourself.com/forum/bo...sion-tank.html

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

If the pressure relief valve on a boiler with a gauge that is reading 10 PSI is dripping, you need to find out why. It could be the gauge is bad, it could be the relief valve is bad, it could be the expansion tank is bad. Or... all THREE.

It's very possible the gauge on the second boiler is defective as well. If there is low pressure in the boiler the water won't be pumped properly through the upper floors.

Check the gauges first. Don't presume that because they were serviced that the tech checked the gauges. I guarantee that he did NOT. I also guarantee that he did not check or adjust the expansion tank air charge.
 
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