Nest Wiring Diagram Heatlink. Connect to the thermostat wires skip to the next step if youre installing the nest thermostat on the stand and are using the usb cable for power. Does your diagram have any of these labels for the common wire.
Nest heatlink wiring to combi boiler. Megaflow wiring diagram. The nest wiring diagram shows that ot1 from the nest heatlink connects to ot1 on the boiler ot2 connects to ot2.
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In addition to these terminals you can also see the ot1 and ot2 terminals which are used for opentherm. Pre fabricated megaflo unvented hot water cylinders. Theres a little wiring diagram for y plan included in the nest installation guide page 25 that you can follow. See installation diagrams on page 32 installation step by step install in a new spot 25.