I am servicing a hotel that has an old Delta Controls system in it. It has about 90 rooms in it all with the Delta RTS-406 themostat. Many of the thermostats are failing, plus they are ulgly old things.
Does Delta make another thermostat that will directly replace this antique? Will the DNS-24 line work?
What communication protocol do the RTS-406 thermostats work on?
Thanks for any help