Originally posted by thepook
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My evohome system at home is application type 4 in the appendix with a boiler relay and single hot water valve
This retains the ability to set the parameters of cycle rate and minimum run time, a fail safe on the heating if the comms are lost (see pic above), it also allows you to set the hot water temperature, differential and overun
On your 'sundial' system the operation is that evo opens the relay according to the demand and if the comms are lost on the hot water sensor the hot water relay will not switch on. There is no fail safe setting to run the hot water on a purely timed basis for obvious reasons.
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