Hi, does anyone have an installation manual for this back boiler or any
technical knowledge of it - basically what the three 22mm pipes going
into the heat exchanger are??? I need to replace it with a combi but
need to identify these pipes first

"vinnylfc"  wrote in news:1127332290.860093.158950
@g14g2000cwa.googlegroups.com:


> Hi, does anyone have an installation manual for this back boiler or any
> technical knowledge of it - basically what the three 22mm pipes going
> into the heat exchanger are??? I need to replace it with a combi but
> need to identify these pipes first
> 

I've got a baxi573, it may be similar.

It has a flow and return for pumped C/H, the lower outlet is return.

The top outlets are a flow for the C/H, and a flow for gravity indirect hot 
water, this is blanked for a fully pumped system.

According to a diagram, the return from the hot water circuit is tee'd in 
to the C/H return before it enters the boiler, hence only 3 connections.

HTH

mike

On 21 Sep 2005 21:59:47 GMT, mike ring
 wrote:


>"vinnylfc"  wrote in news:1127332290.860093.158950
>@g14g2000cwa.googlegroups.com:
>
>> Hi, does anyone have an installation manual for this back boiler or any
>> technical knowledge of it - basically what the three 22mm pipes going
>> into the heat exchanger are??? I need to replace it with a combi but
>> need to identify these pipes first
>> 
>I've got a baxi573, it may be similar.
>
>It has a flow and return for pumped C/H, the lower outlet is return.
>
>The top outlets are a flow for the C/H, and a flow for gravity indirect hot 
>water, this is blanked for a fully pumped system.
>
>According to a diagram, the return from the hot water circuit is tee'd in 
>to the C/H return before it enters the boiler, hence only 3 connections.
>


Yes that's correct. The flow of the pumped circuit across the injector
tee "sucks" the gravity fed hot water circuit.

The hot water circuit returns to the branch of the tee which should be
at the bottom. 

Baxi used to send out paper copies of manuals totally free - obviously
the older manuals are not available on their site as PDFs. Call them
and ask.

Mr F.