The two wires from the old thermostat has only 12 volts. 24 volts combined. Its the R A W WIRES. There is a transformer 12V at the HVAC with 2 wires. Each wire has 12 V. Combined they have 24V.
My 3M-30 gets only 12V. How do i wire to get 24V, to make ir work.
Really need to know what you are attempting to hook the thermostat up to. Please post model# & manufacturer of the appliance that you want to hook the thermostat to. Also RTCOA the manufacturer of the thermostat has a forum at http://forums.radiothermostat.com/vi...e1215621c547d3 that may already have the answer to your question.