As some thieving renter has AGAIN switched on pool heat (this time my CCTV got 'em!) I want to install 2 very simple relays to allow me to control the pump and the heater. I don’t need to monitor temperature or anything fancy because the pump is only single speed and the heater is getting on in years so I will at some point replace the lot by which time I hope someone has a decent ST compatible pool controller!
What I’m thinking is
Nutone NFS20Z which is only 20 Amps but can be wired as what appears to be called “dry contact wiring” in the USA (the contacts are open/closed but the main power supply powering the relay is not switched through to the contacts). This would allow me to use this relay to break the “call for heat” line to the heater which would prevent its use.
The pump is 30 Amps but the Aeon Labs ZW078-A will cope up to 40A so should be OK
Any comments or suggestions/alternatives welcome