Looking to repair or replace your CV450 relay board assembly? The NuTone 147 Relay is the correct part for your CV450.
You can change your central vacuum relay without calling a professional. We always recommend our customers tackle this DIY project themselves. The CV450 relay is no different.
First: Unplug your 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 one wire at a time. By doing this, there will be no confusion regarding which wire gets connected where.
Finally: Remove the old defective relay and install the new relay.