In a large old house with 22 radiators with pressurized system need to replace the boiler and install controls. Plan on installing Worcester Greenstar 40 CDi or Vaillant ecoTEC plus 438 boiler. Thinking of Danfoss Tp9000Si Programmable Room Thermostat upstairs, Sunvic Select 307XL 3 channel programmer downstairs.
It has Megaflow DHW with its thermostat and pump and due to the layout of the house the only sensible CH zoning will be to have three sub zones off one main heating one using S plan plus.
Plan is separate pump for CH then 2 port valve to all the heating with 3 other 2 port valves separating secondary zones off this. The 1st primary zone can provide general background on ground floor, 2 zones can independently add extra rooms on the ground floor, the 3rd zone add in heating for upstairs.
Plan a 2 channel room stat to control upstairs CH and DHW. Three channel programmer and 1 room stat to control the 3 zones (main background plus the extra rooms). Question is how to wire it to prevent feedback loops to zone valves and allow pump overrun for the correct pump (DHW or CH) while holding open only the correct valve.
None of the programmers seem to have enough sense built in to handle this sort of situation so suggestions on programmers also welcome.
Thanks.
It has Megaflow DHW with its thermostat and pump and due to the layout of the house the only sensible CH zoning will be to have three sub zones off one main heating one using S plan plus.
Plan is separate pump for CH then 2 port valve to all the heating with 3 other 2 port valves separating secondary zones off this. The 1st primary zone can provide general background on ground floor, 2 zones can independently add extra rooms on the ground floor, the 3rd zone add in heating for upstairs.
Plan a 2 channel room stat to control upstairs CH and DHW. Three channel programmer and 1 room stat to control the 3 zones (main background plus the extra rooms). Question is how to wire it to prevent feedback loops to zone valves and allow pump overrun for the correct pump (DHW or CH) while holding open only the correct valve.
None of the programmers seem to have enough sense built in to handle this sort of situation so suggestions on programmers also welcome.
Thanks.