Question: how many amps can a 40 va transformer handle?
Answer: 40 Watts / 24 Volts = 1.66 Amps. This 1.66 Amps is the amount of current that can safely be drawn on the 24volt R or C control circuit wire. Place an Ammeter on the R or C wire of a 40 VA transformer that has been replaced. Turn the Tstat to the “fan on” position • If the amperage is below the 1.66 try “cool and 60”.