NuTone 0521B-000 Central Vacuum Relay Repair Kit for 352, CV350, CV352, CV353, CV550, CV553, CV353W CV400 CV400C CV450W, CV-450W etc

This genuine Nutone Central vacuum relay fits the models: 352, CV350, CV352, CV353, CV550, CV553, CV353W CV400 CV400C CV450W, CV-450W. Part #0521B000, 0521B-000, S0521B000, 44277 Relay Board Assembly

KIT REPLACES:
TWIN RELAY ON CV400 & CV450
BLUE WIRE IS NOW WHITE
RED WIRE IS NOW YELLOW
IF 5 WIRE-CAP OFF EXTRA 2 WIRES WITH WIRE NUTS
BEFORE MAY 1997, SHOULD BE 5 WIRE