There are two different types of PV installations that can be performed by your installer. To identify your current installation the easiest method is to look at the transmitter
A Type 1 Henley Block installation will have two sensor cables in ports 1 and 2
A Type 2 Consumer Unit installation will have a Y Cable connected to the transmitter as shown below -please note other cables not shown for simplicity two sensor leads are then connected to the Y Cable and a 3rd sensor cable to port 2 of the transmitter
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