Most large ac units have internal relays/contactors operated via a 24v coil. You may want to look at a relay that will also switch the control 24v coil in parallel to operate the main relays/contactors.
Most large ac units have internal relays/contactors operated via a 24v coil. You may want to look at a relay that will also switch the control 24v coil in parallel to operate the main relays/contactors.