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Posted by Bubba on March 16, 2007, 3:34 pm
>
>> Hi all,
>>
>> My house is heated with hot water baseboard radiators. The hot water
>> is supplied by a boiler furnace with circulation pump. The furnace
>> has an automatic fill valve that is kept in the off position unless
>> the system needs water. It is them manually opened until proper
>> pressure is achieved. The burner comes on at about 150 degrees and
>> goes out at 160 degrees. I try to maintain about 18psi at 160 degrees
>> system pressure. The safety blow valve is set to blow at 35psi. It
>> has an air purge valve at the top of furnace just below the floor
>> above it (about 10 feet from basement floor).
>> The air purge valve is new and so is the expansion tank. The
>> expansion tank pressure seems to match the boiler pressure.
>>
>> Here's the problem. Every couple of days the system pressure has
>> dropped to about 10 or 11 psi at 160 degrees. This effects the
>> efficiency of both the radiator heat as well as the potable hot water
>> (which is heated bythe boiler).
>> I open the fill valve, purge the air and close it all back up at 18psi
>> at 160 degrees. All is well for another couple of days until the
>> pressure if back down and I repeat the process.
>>
>> I don't see any leaks, no water dripping from ceilings or pooling
>> anywhere that I can see. One room of the house is a concrete slab
>> floor (converted carport). It has heating pipe within the concrete
>> slab.
>>
>> I keep adding water and purging. What could cause the pressure to
>> keep dropping?
>> I'm out of ideas.
>>
>> Thanks in advance,
>
>
>Are you serious, you add water and then pressure goes down, then you add
>more water and pressure goes down, then you add more water and the pressure
>STILL goes down...
>
>And you DON'T know what's happening????
>
>Here is you answer:
>Your water is contracting till it disappears... try filling the unit to 16
>P.S.I. not 18, this will make the water more stable.
>
>Also remember, if your car tire will not hold the proper air pressure, try 2
>P.S.I. less.
>
KJ, you may be right about that but just incase............he needs to
replace the thermostat if that doesnt work. Its almost always the
thermostat.
Bubba
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>You believe me, RIGHT? :-)
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