I have a customer who has a profile with an airlock on the gravity circuit. The airlock appears to be within the cylinder HE and since my first attempt at sucking the airlock out failed, the customer would prefer to convert to fully pumped rather than pay for an inherent defect to be temporarily fixed, which is fair enough.
The layout is as follows:-
The boiler is in the kitchen with horribly twisted and mangled 28mm gravity primaries behind a bit of studwork which will have to be removed.
The pump is in an adjoining cupboard and is on the return side of the CH. The CH flow is easiliy accessible.
The cold feed and open vent are both in 15mm and are connected to the gravity return and flow respectively. The tappings for the HE are completely inaccessible. The HWC is located in the first floor bathroom.
It would be extemely difficult and disruptive to to extend the cold feed and open vent down to the adjoining cupboard (the proposed location for the new 3PV).
So, my query is as follows:-
It will be easy enough to alter the pump so is is on the flow side, It should also be easy enough to install the motorised valve, new programer, room stat and wiring centre. It would also be easy enough to convert the cold feed and open vent to provide a neutral combined cold feed and open vent on the flow side - which would also allow me to fit a manual vent on the HW return side. The reason why I can't do this though is that when just the heating circuit is on, there will be no open vent accessible since it is located on the HW flow. If I convert it so that the flow and return are on the return side, the open vent will always be there since the return is common but I am concerned about sucking air in.
Could I have your comments and thoughts please?
Regards
The layout is as follows:-
The boiler is in the kitchen with horribly twisted and mangled 28mm gravity primaries behind a bit of studwork which will have to be removed.
The pump is in an adjoining cupboard and is on the return side of the CH. The CH flow is easiliy accessible.
The cold feed and open vent are both in 15mm and are connected to the gravity return and flow respectively. The tappings for the HE are completely inaccessible. The HWC is located in the first floor bathroom.
It would be extemely difficult and disruptive to to extend the cold feed and open vent down to the adjoining cupboard (the proposed location for the new 3PV).
So, my query is as follows:-
It will be easy enough to alter the pump so is is on the flow side, It should also be easy enough to install the motorised valve, new programer, room stat and wiring centre. It would also be easy enough to convert the cold feed and open vent to provide a neutral combined cold feed and open vent on the flow side - which would also allow me to fit a manual vent on the HW return side. The reason why I can't do this though is that when just the heating circuit is on, there will be no open vent accessible since it is located on the HW flow. If I convert it so that the flow and return are on the return side, the open vent will always be there since the return is common but I am concerned about sucking air in.
Could I have your comments and thoughts please?
Regards