Hi all,
I am after a bit of advice, aftering reading up this is what I want to do.
I have a potterton condensing boiler, megaflow unvented hot water with three 2port valves. Valves are currently for HW, downstairs CH zone and upstairs CH zone. Currently the valves are controlled by CH thermostats, most rads have myson standard TRVs. There is a bypass valve on the system and the pump is controlled by the boiler for pump overrun.
I want to be able to set my boiler cycle amount and run time, as there is an issue with the boiler firing after it has been left for long periods of time. Potterton don't auto cycle, neither does my thermostats.
I want to phase the installation, so my plan is evohome controller, HW pack wiring the brd91 to the HW 2port valve. Disconnect the wiring to the two CH valves and leave them open. Another BDR91 as the boiler relay. I assume I need at least one evohome TRV to get the CH to work, then add more as I get more time.
Is this reasonable?
2 questions spring to my mind,
1) do I leave the wiring for the HW 2 port valve to fire the boiler as it is now? So the contact switch in the HW valve fires the boiler for HW?
2) do I leave the pump power supply as it is currently, running off the boiler for the pump overrun feature?
Thanks in advance for your responses.
Neil
I am after a bit of advice, aftering reading up this is what I want to do.
I have a potterton condensing boiler, megaflow unvented hot water with three 2port valves. Valves are currently for HW, downstairs CH zone and upstairs CH zone. Currently the valves are controlled by CH thermostats, most rads have myson standard TRVs. There is a bypass valve on the system and the pump is controlled by the boiler for pump overrun.
I want to be able to set my boiler cycle amount and run time, as there is an issue with the boiler firing after it has been left for long periods of time. Potterton don't auto cycle, neither does my thermostats.
I want to phase the installation, so my plan is evohome controller, HW pack wiring the brd91 to the HW 2port valve. Disconnect the wiring to the two CH valves and leave them open. Another BDR91 as the boiler relay. I assume I need at least one evohome TRV to get the CH to work, then add more as I get more time.
Is this reasonable?
2 questions spring to my mind,
1) do I leave the wiring for the HW 2 port valve to fire the boiler as it is now? So the contact switch in the HW valve fires the boiler for HW?
2) do I leave the pump power supply as it is currently, running off the boiler for the pump overrun feature?
Thanks in advance for your responses.
Neil
Comment