Vent pipe T in attic to pump?

[mikegm]

This is similar to an earlier post. About 5 or 6 years ago the guy who fitted our bathroom (before I qualified) used the vent (previously been 'T'd) just as it emergies into the attic (so just off the attic floor). There had already been a 22mm pipe coming from the vent, but had been capped off. He then reduced to 15mm to feed pump. Never had any problems. If I needed to do this for a customer, is this the correct way, or at least OK to do this?

 

[seco services]

not really should come straight off the hw cylinder.
seen many that have worked and many that have caused starvation.

 

[mikegm]

Thanks for that. Maybe I should point out that the pump itself is about 6 feet away in the attic. An Aqualisa shower. Two pipes into pump (H&C), but only 1 pipe out into riser rail. As I am new to all this, what is the process, how do I go about taking a feed direct from HW cylinder? ie after draining cylinder down what 'Bits' do I need?

 

[kevplumb]

View media item 14782
surrey flange

View media item 14781
essex flange

surrey is easier

 

[seco services]

An Aqualisa shower. Two pipes into pump (H&C), but only 1 pipe out into riser rail.

something tells me this is not the twin pump that we was thinking but an aqualisa digital shower is that true ?

 

[mikegm]

Not sure by 'Digital' One button for on, surrounded by temp dial. Bottom half has booster button. As I say 2 pipes into pump, (H&C) 1 pipe out into riser.
With the Surrey or Essex flange, roughly where would these be placed on the cylinder?

 

[seco services]

this is one of the digital showers.

the surrey flange go's in the top of the cylinder.
the shower supply comes out the side of the flange and the existing pipe comes out the top.
as in diagram.

aqualisa do also allow a connection to the horizontal pipe from the cylinder as well for this shower.

 

[mikegm]

Thanks for all that info. Sorry I've only just seen it! I'll print it all out for future ref.