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View Full Version : What does a relay do on a Trane XL-80

Crazyg999
Aug 6, 2010, 05:38 PM
Mh
Stratmando
Aug 6, 2010, 05:43 PM
It allows Large Current/Voltage to be controlled by small low voltage wires from thermostat.
In most AC's, the relays/contactors are controlled by 24 volts AC.