Dear All
Sharing a pet project which might help. I recently renovated our kitchen, wall knock down etc. We had to lose a radiator (out of 2 for the room) and had no where to put one. Only option available to us was to use electric UFH (from http://www.prowarm.com/underwood-heating) . Trouble is I wanted to keep it as part of evohome.
The BDR from Honeywell has a limitation of being only to switch 1000 kw (1500 tops). Most UFH solutions bigger than 10m2 need more than this.
After discussing with some electrical engineers , they suggested using a contactor from https://www.mkelectric.com/en-gb/Pro...s/default.aspx
A contactor is like a relay (don't shoot me here as this is my understanding) - the BDR provides a voltage input which can 'switch' the larger amp rated 'switch' function inside.
The trick is to put the BDR after the UFH Thermostat. This then means the UFH thermostat is set to permanently on but has the safety measure of the UFH sensor to set a floor limit. The BDR then switches the 'post thermostat' current to the floor mat.
I then bound this into the evohome as a zone (as zone valve). Then bound in an external sensor (SZT or you can use DTS92). Hey presto E-UFH controlled by evohome.
Will do some tests but right now seems to work well.
R
Sharing a pet project which might help. I recently renovated our kitchen, wall knock down etc. We had to lose a radiator (out of 2 for the room) and had no where to put one. Only option available to us was to use electric UFH (from http://www.prowarm.com/underwood-heating) . Trouble is I wanted to keep it as part of evohome.
The BDR from Honeywell has a limitation of being only to switch 1000 kw (1500 tops). Most UFH solutions bigger than 10m2 need more than this.
After discussing with some electrical engineers , they suggested using a contactor from https://www.mkelectric.com/en-gb/Pro...s/default.aspx
A contactor is like a relay (don't shoot me here as this is my understanding) - the BDR provides a voltage input which can 'switch' the larger amp rated 'switch' function inside.
The trick is to put the BDR after the UFH Thermostat. This then means the UFH thermostat is set to permanently on but has the safety measure of the UFH sensor to set a floor limit. The BDR then switches the 'post thermostat' current to the floor mat.
I then bound this into the evohome as a zone (as zone valve). Then bound in an external sensor (SZT or you can use DTS92). Hey presto E-UFH controlled by evohome.
Will do some tests but right now seems to work well.
R
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