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We have a two pipe low pressure steam heat system. one of our radiators is not working.

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You probably have an airlock condition and need to release the vent to let trapped air escape but be careful when doing this steam can cause severe burns.

Posted on Nov 15, 2008

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Posted on Jan 02, 2017

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I have a lot of noise coming from the pipes i have bleed the air valves from the registers and still have the noise


you can not bleed air from a air con system like you can a radiator in your home its against the law the system will need to have the gas removed checked for leaks put on a vacum then recharged bleeding will not work

Jan 21, 2011 | Heating & Cooling

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We own an apartment building that has the old radiator steam heat powered by a gas bolier .. It heats 11 apartments and 3 store fronts. recently 1 of the apartments called and said that they were not...


the steam is not flowing to that radiator because of a blockage in the pipe or radiator, the valve may have an obstruction or the radiator is water bound. Remove the vent and see if the heat improves. If not, you have a blockage in pipe or valve.

Jan 08, 2011 | Heating & Cooling

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Hhow to set the pressuretrol??


Hi,
I assume you are talking about a steam heating system...
There are two screws on the top of the pressuretrol...


turn the pressure screw down to the lowest pressure at which you still get heat to the farthermost radiator...make sure the vents are working...or steam does not flow to displace the air...
Then just give the differential screw enough difference so the boiler cycles on and of a bout three times and hour...when making steam...
That's all there is too it...

heatman101

Oct 08, 2010 | Heating & Cooling

1 Answer

Help my poor clogged cast iron steam radiator, we need you back!


Hi,
If you have a two pipe system, meaning there are two pipes going to the radiator then you may have a trap that is bad, meaning that it is not opening up and allowing the steam to go into the radiator. Look on the side that the steam goes out of. Opposite the valve and there will be a round thing. The trap is inside that and will need to be replaced. This should be done by a propessional or at the least you need to make sure you get an exact replacment for it.

If you have a one pipe system then you may have a venting problem. There will be a silver thing on the side of the radiator that allows the air out of the radiator when it is cold and allows the steam to enter the radiator. This too needs to be replaced properly. Just anyold one will not do. There are many different models with different flow rates. The flow rate needs to be properly figured.
The chances are that your radiator is not plugged, but nees to have the venting fixed.If the air cannot get out of the radiator the stem cannot get in.
Make sure that you radiator is venting and you will probably have heat there.
I hope you have checked that the valve on the radiator is open... :-)

Heatman101

Jan 16, 2010 | Heating & Cooling

8 Answers

What causes high pressure in cooling system?


i can give you a general answer. the cooling sys is a closed system. as the engine warms up pressure is also increased. kinda like how a boiler works, or a pressure cooker. i dont know the figure of how much pressure is produced within an engine that is operating normally. the engine's thermostat. the thermostat of many car engines opens at 195 deg coolant temp, allowing the coolant to circulate. high pressure when considering a car's cooling sys to me is relative. if you try to remove the radiator cap when the engine is at/near/above operating temp you will be burned by the hot coolant under pressure rapidly escaping out the radiator. most pressure that is above normal is caused by an obstruction somewhere in the system. a t'stat that is stuck shut is an example. air pockets within the system will also lead to high pressure within the system. air pockets occur when you refill the system with coolant/water. pouring water/coolant back into the radiator traps air that can circulate throughout the system and you must ensure that these air pockets escape out the radiator, or you risk damaging the engine from excessive heating.

Aug 09, 2009 | 1993 Chevrolet Suburban

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My 1990 subaru legacy was running fine-I went to the store less than a mile away and when I got home something was leaking from underneath the car and there was steam coming from under the hood..i don't...


Just because it was not hot to the touch, does not mean it is not a coolant loss problem----if the coolant is so low, there may not be enough to make the radiator hot (though usually the steam in the system will).
...a stuck thermostat can also let the engine overheat while the radiator remains cool (the fluid only circulates within the engine and is stopped from getting to the radiator.
...likewise a hose could have burst below and let the coolant out, over heating the engine, and the steam going out the ruptured/popped off hose; would look underneath..
...when cool, check the level in the radiator (likely empty),
...and less than a mile away, may not have ever heated the radiator, though usually only a mile to heat up the coolant
...of course there is always sabotage
...and water pump failure, (so no water circulated) causing overheating and no radiator heat, and possibly enough pressure to blow off a hose, but usually the radiator cap relief spring would allow pressure to escape (and that steam would heat up the radiator on the way---but if only steam in the radiator, it would cool off quickly after venting, because no more water in the radiator to hold the heat. all depending on climate,temp and further details , symptoms..
hope helps..

Aug 09, 2009 | 1990 Subaru Legacy

1 Answer

Open vent central heating


yes it is possible toupgrade the system to a sealed one using a system boiler as you mentioned. the thing to bear in mind is to upgrade the radiator valves to pressure rated ones 10bar.
The probable cause of the over heating is down to the system being sludged up/cold feed blocked, or possible pump circulating problem?
I would recommend the installation of a magna clean filter to help keep the new boiler clear from system debris.I would definately power flush the system, if the system is a twin two port valve system then a automatic bypass should be fitted, all of this done by a corgi registered gas engineer

Kindly

Richie

Dec 18, 2008 | Protech Systems FasNSeal FSWMKE4 4" Vent...

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