View Single Post
  #7   Report Post  
Posted to uk.d-i-y
Keefiedee Keefiedee is offline
external usenet poster
 
Posts: 104
Default Wiring diagram for fully pumped Honeywell S plan

On Oct 14, 2:14*pm, "PM" wrote:
Keefiedee wrote:
On Oct 13, 7:11 am, Keefiedee wrote:


I think I've got it. *The pumps don't go between the thermostats and
the motorised valves, but are fed from the thermostats rather than fed
from the switches in the motorised valves.


Will someone please confirm?


Keith


Why do you want two pumps?

You have two valves which are opened /closed by the room stat and tank stat.
If either valve is open, the boiler fires and the pump runs.


Because the HW and CH have separate pipework coming out of the boiler,
and the HW was only heated by gravity before I fitted the pump. I
know a pump isn't absolutely necessary, but I wanted a more efficient
system.