EWC Controls

EWC Controls, Inc. is an HVAC zone control manufacturer founded in 1961, pivoting to HVAC zone control in 1988 with the Ultra-Zone forced-air zoning system. The Ultra-Zone platform supports up to 30 zones from a single air handler. Products are distributed through wholesale channels including SupplyHouse.

EWC Controls Product Lines

• Ultra-Zone Control Panels: Multi-zone panels supporting two-stage cooling and four-stage heat.
• Motorized Zone Dampers: Round and rectangular 24VAC dampers in standard duct sizes.
• Zone Thermostats: 24VAC thermostats for individual zone temperature control.
• Bypass Dampers: Barometric and motorized bypass dampers to protect the air handler.
• Wireless Zone Controls: Wireless accessories for retrofit zoning.

Why Contractors Specify EWC Controls

Ultra-Zone supports up to 30 zones from one system with built-in bypass control logic, covering two-stage cooling and four-stage heat for heat pump and conventional systems.

How to Choose an EWC Controls Product

Select the UZC-series panel based on zone count and equipment staging. Match damper size to duct diameter at each branch takeoff. Install a bypass damper sized to the supply trunk.

Frequently Asked Questions

• Maximum zones? Up to 30 from one air handler.
• Heat pump compatible? Yes, with auxiliary heat staging and defrost override.
• Separate damper power? No, runs on 24VAC from the zone panel.
• Smart thermostat compatible? Yes, with standard 24VAC wiring.
• Bypass damper included? No, ordered separately.