NuTone Relay Board Assembly for CV450 10941147Genuine NuTone Relay Board. NuTone Relay Assembly for CV450. Designed to fit the top and bottom motor for Nutone Central Vacuum CV450. Part # 10941147, S10941147 Works for NuTone CV400 (prior to 2010) NuTone CV450 Replacing Your NuTone 147 Relay Board: First: Unplug your NuTone central vacuum power unit from the electrical socket. This ensures there is no power going to the unit. Next: Remove one wire at a time and connect that wire to the new relay
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