In recent weeks, it has become apparent to me that the external temperature sensors on Nibe* heat pumps are very prone to the effects of the Orkney weather. The image to the right shows the internals of a typical Nibe outdoor sensor that is suffering from the ravages of the local Orcadian weather.
These sensors are critical to the correct operation of the heat pump and its failure can cause incorrect operation or total deactivation of the system as a whole.
This project is progressing well. I have been seeking funding channels to get a bunch of pre-production ‘sweet-spot’ units built, along with microprocessor control boards in order to evaluate the ‘sweet spot’ controlling on boilers and heat pumps.
My prototype control circuitry for a cheap proportional hydronic central heating diverter/blender valve is progressing well.
The MkI version worked well with just mechanical switches. Producing a valve which can be set and held in any position of its normal rotational path. This now allows me to produce a CT (Constant Temperature) valve and control unit for well under £100. A significant saving on current units,which sell for several hundred pounds.
Available for pre-order on Amazon Kindle is my latest publication. Regarding the consequences of not dealing with condensing oil and gas boiler condensates. This short and informative publication covers the damage that can occur if the condensate from your condensing boiler is not disposed of correctly, how it should be disposed of and what are the effects of letting this liquid go where it likes.
At the end of last week, I was called to an air source heat pump, that had ceased operation. The obvious failure was a blown fuse on the main PCB. This fuse was so well blown, that the wire was vaporised perfectly on the inside fuse glass. This implies that there was serious short somewhere.