blueroomelectronics
Well-Known Member
I've noticed simple*wall thermostats have a single relay with fan & AC/heat done with a pair of switches. So it seems that as few as three relays could automatically control a typical homes AC & furnace.*
On the other hand I've seen high end HVAC thermostats with as many as six relays to run zoned systems and/or heat pumps...
So the question is would a four relay be enough for most people or would a six relay device offer much more flexibility?
Also how much current? All the thermostats I've had a look at use 2A relays is there any advantage to a 5A relay?
Lastly how many SPST relays vs SPDT, I was thinking 4 SPST & 2 SPDT would be about right.
On the other hand I've seen high end HVAC thermostats with as many as six relays to run zoned systems and/or heat pumps...
So the question is would a four relay be enough for most people or would a six relay device offer much more flexibility?
Also how much current? All the thermostats I've had a look at use 2A relays is there any advantage to a 5A relay?
Lastly how many SPST relays vs SPDT, I was thinking 4 SPST & 2 SPDT would be about right.