Danfoss Randall FP715SI Heating Programmer

Product Information

The terminals used will depend on the design of plumbing system that it is controlling. Yours is commensurate with very many in the UK. Some do have a connection to terminal 1 others, like yours don't need it. None, (with a few very rare exceptions, normally old installations) have a connection to terminal 2. I got it wrong, so trying to stop you making same mistake, I selected Energenie as was told they worked with Nest, but that is not the case. There is a guide here which also says Energenie works with Nest, seems they did until Google took them over. The Danfoss FP720 (replacing the FP715Si) two-channel full programmer has separate heating and hot water outputs operating on completely independent time bases for maximum flexibility. The FP715 Si two-channel full programmer has separate heating and hot water outputs operating on completely independent time bases for maximum flexibility.

replacing a danfoss fp715 with a fp720 - DIYnot replacing a danfoss fp715 with a fp720 - DIYnot

It seems the Drayton Wiser TRV head is about the best, with algorithms to work out how long it takes to heat a room without over shooting, and the base has the option to work with OpenTherm with an add on module. Since I use oil OpenTherm does not interest me. The Danfoss FP715Si is a thermostat that offers precise temperature control for residential heating systems. Designed with functionality in mind, this thermostat allows users to easily adjust and maintain their desired indoor temperature. In terms of installation, the FP715Si offers flexibility. It can be hardwired or configured for battery operation, depending on the user's preferences and needs. This ensures compatibility with a wide range of heating systems. The wallplate used follows the industry standard pattern, as used by many of the other time control manufacturers. This allows for direct replacement often without the need for re-wiring. There is a 230 volt and 24 volt model it seems, this is the instructions. https://www.plumbase.co.uk/link/1/h002877_20563_t.pdf

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So, from what I am gathering, I can buy pretty much buy any 2-channel CH/HW controller, but need to get a good sparky in to do the necessary wiring and installation. Can I confirm if you all agree that this is correct and a sensible approach? Additional features such as service interval timer, convenient user overrides, built-in ready-to-use programmes, a day programme copy facility as well as a stylish, compact design and easy to read display make the FP715 Si the simple answer to all heating and hot water requirements. The FP715Si features a user-friendly interface and a clear digital display, making it simple to program and operate. With its intuitive navigation, users can easily set up specific heating schedules and temperature levels for different times of the day.

DANFOSS FP715 SI PROG 7DAY/5-2DAY/24HR | Wolseley

Relieved to see that this programmer is still available but thanks to coronavirus getting a tradesman to fit one could be a problem as we are in isolation due to age. But the Hive is much simpler and cheaper, no option for Opentherm, and no cleaver algorithms, and the base stops taking a demand for heat after 22ºC so the base unit really designed to be in a room normally kept cool, like the hall. I apologise that this has turned into a bit of an essay, but any expert help you could pass on to me would be greatly appreciated. If however as likely it switches 230 volt, then you can fit a system which can link to TRV's in the future allowing you to control each room independently.Although your likely not considering swapping all TRV heads to linked heads now, before selecting a replacement you need to consider what you may want to do in the future. the Motorised Valves (HPA2) or your Circulating pump - its not always the timers fault but your electrician will be able to diagnose the fault for you before you buy. An additional range of accessories allow the FP715 Si to be used in other upgrade situations where the unit being replaced is larger than the new unit and a decoration scar would normally have been left.