Is the SWT2978 a direct replacement for the SWT02978

Loud humming usually indicates dirt in the magnet assembly or low voltage from the 24V transformer

OEM Precision: Guaranteed direct replacement compatibility for specific York and Johnson Controls equipment

eliminating the need for mounting modifications or wiring adapters

Flexible Voltage Logic: Supports both 115V and 230V configurations

Aprilaire 4330 Scale Control Insert 326058-758 Is the SWT2978 a directThe Aprilaire 4330 Scale Control Insert is a critical component designed to maintain the efficiency and performance of your whole house humidifier. Specifically engineered for use in Aprilaire Model 400, 400A, and 400M units, this high quality humidifier replacement part effectively captures mineral deposits and scale buildup from the water panel. By managing evaporator scale control, the 4330 insert prevents excess mineral accumulation from clogging