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Open vent issue
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21-06-2012 6:18pm#1
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spireland32 wrote: »If there's no vent pipe there must be a vessel somewhere... Under the floor, under the stairs, in a press could be anywhere. Is there a nrv on the cold supply?
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Billy Bunting wrote: »
what do you not understand?
if theres no vent pipe it must be a closed system and a pressure vessel must be located somewhere in the house.... get me?
Sorry just read that back billy... sound like a w@nker. didnt mean to come across like that0 -
spireland32 wrote: »what do you not understand?
if theres no vent pipe it must be a closed system and a pressure vessel must be located somewhere in the house.... get me?
but does the op understand ???going into detail like this can be a waste of time typical diyer incompetence0 -
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spireland32 wrote: »what do you not understand?
if theres no vent pipe it must be a closed system and a pressure vessel must be located somewhere in the house.... get me?
Sorry, but have you ever heard of a combined cold feed and expansion pipe.0 -
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spireland32 wrote: »Of course... but the OP said there was NO vent pipe in the attic. A common cold feed and expansion would/should be 3/4, as you said, off the top of flow pipe on the coil up into the attic. Spilt 1/2 into the tank for the fill and continue 3/4 up and over the tank for a vent.
So presumably if the 1/2 cold feed was an undersized feed and vent pipe that would mean it may well not be a sealed system.
As i said on post1 the diagram is vaige.
Incidentally, it doesnt need to split and vent over the tank.0 -
Billy Bunting wrote: »spireland32 wrote: »Of course... but the OP said there was NO vent pipe in the attic. A common cold feed and expansion would/should be 3/4, as you said, off the top of flow pipe on the coil up into the attic. Spilt 1/2 into the tank for the fill and continue 3/4 up and over the tank for a vent.
So presumably if the 1/2 cold feed was an undersized feed and vent pipe that would mean it may well not be a sealed system.
As i said on post1 the diagram is vaige.
Incidentally, it doesnt need to split and vent over the tank.
Yes im aware of a combined system but it being a half inch pipe made me think something is wrong. and i am wondering is this safe if it is a combined system and the pipe is half inch..0 -
Billy Bunting wrote: »So presumably if the 1/2 cold feed was an undersized feed and vent pipe that would mean it may well not be a sealed system.
As i said on post1 the diagram is vaige.
Incidentally, it doesnt need to split and vent over the tank.
Suppose it doesnt need to spilt but i have never seen one not. Unlikely not to have a vent up and over IF it is an open system. It could be over the domestic tank seen that loads of times. In fairness it could be anything and we're only guessing at this stage! open, closed, vessel, vent, non return, common cold feed and expansion.... Put the kettle on0 -
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:):)..... Thats a UK way of doing it 
(i am not a racist, i love black people) 
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