Replace Number : 6536A3351, 6536-3451, 6535-3451, 6759B3451 w/ 7330-3401 Sub Base，6759B3451 w/ 7330-3411 Sub Base. The thermostat body consists of a 9 pin plugthrough and a 3 pin plugthrough. The 9 pinplugthrough is connected to the heat pump and the 3 pin plugthrough is connected to the socket.
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