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Installing Thermostat without a C Wire
Power Extender Kit (PEK)
If your system does not have a C wire, you must install the power extender kit (PEK). The PEK connects to your thermostat
wires to create a circuit that provides power to your thermostat.
The PEK has 4 terminals on one side and 5 terminals on the other side.
• The side with 4 terminals is not pre-wired. Connect the thermostat wires to the terminals.
• The side with 5 terminals is pre-wired to connect to your HVAC control board.
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