I have recently bought a Honeywell rth9580 programmable WiFi thermostat. Unfortunately I have old electric heating/cooling system probably from 70's. The system is based on two relays (I guess heating and cooling). Since transformer doesn't have 3rd wire (C?) by default I would like to make one by connecting extra wire to transformer chassis. Having terminal C I would like to connect wire G to terminal C and jump terminal G with Y. I measured the voltage between transformer chassis and Rh wire: idle 34VAC, calling for heating/cooling 24VAC. Here are my questions: 1) Is this setup will work? 2) Is it safe to connect thermostat since voltage on idle is a bit higher than it supposed to? 3) Am I right to assume that transformer won't overheat because thermostat will try to drain to many amps?
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