Hello from a Newbie!
Back in '66 my old Dad (God bless his soul
) installed a Drayton Theta electronic proportional controller in my Ma's house. The hot water is gravity fed, controlled by a Cyltrol valve. The central heating is inside/outside control. ie; There is an outside temp sensor and a ch flow temp sensor. The temp of the water to the rads is varied by redirecting the return water back through the rads via a 3 way mixing valve controlled directly from the Theta Controller. This was considered a very Hi-Tech system in it's time. Now my Question. The Theta controller is "ticking" and my Ma seems to think it isn't working as it should. I would assume a new Controller would be rarer than rocking horse doodah. I would like to update the controls to something newer. Obviously just fitting a 5/2 programmer and a room stat is going to require a fair bit of reworking of the pipework. Is there a modern inside/outside controller available? Or would it be worth my while changing out the sensors (They are just thermistors), and maybe having a dabble inside the controller to see if any resistors, etc need replacing? I have a spare controller, but my Dad marked it up as "blows fuses". Sorry for the long winded post. Thought I'd get all the facts down!
TIA!
Back in '66 my old Dad (God bless his soul
) installed a Drayton Theta electronic proportional controller in my Ma's house. The hot water is gravity fed, controlled by a Cyltrol valve. The central heating is inside/outside control. ie; There is an outside temp sensor and a ch flow temp sensor. The temp of the water to the rads is varied by redirecting the return water back through the rads via a 3 way mixing valve controlled directly from the Theta Controller. This was considered a very Hi-Tech system in it's time. Now my Question. The Theta controller is "ticking" and my Ma seems to think it isn't working as it should. I would assume a new Controller would be rarer than rocking horse doodah. I would like to update the controls to something newer. Obviously just fitting a 5/2 programmer and a room stat is going to require a fair bit of reworking of the pipework. Is there a modern inside/outside controller available? Or would it be worth my while changing out the sensors (They are just thermistors), and maybe having a dabble inside the controller to see if any resistors, etc need replacing? I have a spare controller, but my Dad marked it up as "blows fuses". Sorry for the long winded post. Thought I'd get all the facts down!TIA!
