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Wikimedia Commons has media related to Fan coil units. Circuit Sentry Cartridge A It is part of an HVAC system found in residential, commercial, and industrial buildings. If this is the case, you'll want to make the connections as follows: This communication provides access to our Privacy Notice. FCUs can either just recirculate internal air, in which case a separate ventilation system is required, or may introduce s proportion of fresh air that is mixed with the recirculated air.
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Coil return line options. Coil supply line options. I'm trying to upgrade to a new line voltage thermostat. The new thermostat has many more connections, including three fan speeds.
My current system has a manual fan switch on the wall so all I need the thermostat to do is allow power to flow to the fan coil unit. This diagram tries to show how the system is wired and a proposed new wiring.
I propose this because I've tried attaching the heat and cool and neutral from the new thermostat to the R, and the black to the black. The white wire is capped at the thermostat and junction box ends, but I'm proposing to use that as the neutral connection at the thermostat and add it to the W to W current connection in the junction box. Any advice on whether this would work?
Not sure what model equipment you're using, but it seems like the new thermostat requires a neutral connection. If this is the case, you'll want to make the connections as follows:. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Home Questions Tags Users Unanswered.
Fan coil wiring problem with new thermostat Ask Question. Mike Mike 1 1. The whites in the junction box should be pigtailed together regardless of what else you do.