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zeke

12:40PM | 01/28/01
Member Since: 01/08/01
3 lifetime posts
Bvhvac
The pressure on my boiler is about 12, and the altitude reads 30. The radiators in the attic get slightly warm if I put the heat up very high, roasting us. I have been bleeding the three units in the attic, and very often get air followed by water out of 1 of them, and air followed by no water out of the other 2. One of the radiators on the second floor seems to have no air in it, but really doesn't get all that warm unless the thermostat is set very high.
If we raise the psi, will it raise the altitude? The house is probably higher, from boiler to 3rd floor radiator, than 30 feet.
Could the lack of heat in the second floor radiator have anything to do with the 3rd floor?

Thanks.

HOLLYWOOD

06:31AM | 01/29/01
Member Since: 02/19/00
206 lifetime posts
The pressure on the boiler should be about 10 to 15 lbs. 1 psi will raise the water in your boiler about 2.34 feet. 12 psi therefore will get you aprox. 27 feet. Sounds like you have an air problem. All radiators have to be bled to eliminate all air. You will usually find the most on the highest floor. Boiler temp can be about 160 to 200*f. Try to bleed again and let me know what happened.

HOLLYWOOD.

HOLLYWOOD

06:31AM | 01/29/01
Member Since: 02/19/00
206 lifetime posts
The pressure on the boiler should be about 10 to 15 lbs. 1 psi will raise the water in your boiler about 2.34 feet. 12 psi therefore will get you aprox. 27 feet. Sounds like you have an air problem. All radiators have to be bled to eliminate all air. You will usually find the most on the highest floor. Boiler temp can be about 160 to 200*f. Try to bleed again and let me know what happened.

HOLLYWOOD.

zeke

09:43AM | 01/29/01
Member Since: 01/08/01
3 lifetime posts
I increased the pressure to 15 and let the syste run for a while. The temp got to 180. Radiator 1 - got air and water; radiator 2 got air and water -water for the first time; radiator 3 got only air, as usual. Let the system run some more and repeated it - got both out of radiator 1, and only air out of the others. The thermostat had shut down already, and the pressure read 10, with a temp of 165 - 170. Should I blast the heat for a while to force the air out, or increase the pressure some more, or both, or call a plumber (not an option -too stubborn for that).

Thanks again

HOLLYWOOD

12:53PM | 01/29/01
Member Since: 02/19/00
206 lifetime posts
All you have to do is continue to remove the air. All radiators must be air free. Sometimes this can take a-little while, but it has to be done. The pump will not move water through the radiator until this air is removed. It doenen't matter if the pump is on or off. If you get water and air, continue until it's all water. By cranking up the heat, it will not force the air out. It must be removed. Even system with auto vents have to be bled.

James Welty

05:51AM | 02/10/01
Member Since: 02/09/01
8 lifetime posts
I have been in the HVAC field for 26 years. I have found it best to shut down your boiler and pumps. Set your pressure for approx. 12-15 psi. Bleed all high spots untill you get only water, be carefull not to try and go to fast, your make up water valve could be slow filling. Then make sure you pressures are OK and start your pumps and allow them to run for several min. Then bleed again. When you get no more air, start your boiler and you should only need 160 degree temp.

James Welty

05:52AM | 02/10/01
Member Since: 02/09/01
8 lifetime posts
I have been in the HVAC field for 26 years. I have found it best to shut down your boiler and pumps. Set your pressure for approx. 12-15 psi. Bleed all high spots untill you get only water, be carefull not to try and go to fast, your make up water valve could be slow filling. Then make sure you pressures are OK and start your pumps and allow them to run for several min. Then bleed again. When you get no more air, start your boiler and you should only need 160 degree temp.
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