This valve replaces multiple legacy part numbers

Using it with a 240V supply will result in immediate component failure and poses a fire risk

Key Benefits: Heavy-Duty Construction: Zinc die-cast housing provides superior protection against dust and mechanical impact compared to standard actuators

use a multimeter set to ohms

Which humidifier models use the Aprilaire 4403

Resideo VC7934ZZ31 Modulating Actuator 320074-702 This valve replaces multiple legacyThe Resideo VC7934ZZ31 is a high performance modulating valve actuator designed for precise flow control in commercial hydronic systems. Operating on a 24 Vac power supply, this unit utilizes a 0 2 10 Vdc control signal to provide linear positioning for VC series valves. Unlike spring return models, this actuator fails in place upon loss of signal or power, maintaining the current valve position to prevent sudden system shifts. Engineering for high