Taco®, ZVC404-4, Zone Valve Control Module, 4, 120 V, DPDT

Taco ZVC404-4 Four-Zone Valve Control Panel – Centralized 24V Management for Hydronic Systems

The Taco ZVC404-4 is a four-zone control panel designed for use in hydronic heating systems utilizing 2-, 3-, or 4-wire zone valves. This panel consolidates zone management into a single enclosure and includes integrated 24V power output, isolated end switches, and LED diagnostics for streamlined operation and serviceability.

Developed with contractor efficiency in mind, the ZVC404-4 includes a clearly labeled terminal layout, screw connections, and fuse protection for each zone output. It also features a built-in priority setting—commonly used for domestic hot water control—to override space heating zones during priority calls.

Core Features

• Four Independent Zones: Supports up to four 2-, 3-, or 4-wire zone valves
• Dual Isolated End Switches: Enables boiler and circulator control from a single panel
• LED Indicators: Provide zone-by-zone status visibility for fast diagnostics
• Built-in Priority Operation: Assign one zone as priority with automatic override timeout
• 24V Transformer: Integrated and field replaceable, powers thermostats and zone valves
• Fuse Protected Outputs: Each zone output protected to prevent short circuit damage
• Contractor-Friendly Layout: Clear labeling minimizes wiring errors during installation
• UL and CSA Listed: Meets applicable safety and performance standards

Technical Specifications

• Model: ZVC404-4
• Zones: 4
• Input Voltage: 120 VAC
• Output Voltage: 24 VAC (internal transformer)
• End Switch Rating: 24 VAC dry contacts
• Dimensions: Approximately 10-5/8" W x 6-1/4" H x 2-3/4" D
• Mounting: Wall-mount enclosure with hinged access

Installation Considerations

The Taco ZVC404-4 is designed for fast field installation and service. The PC board layout and labeled terminals simplify wiring of thermostats, zone valves, and end switches. Professional installation is strongly recommended to ensure proper integration with boilers and compliance with electrical codes.

Application Notes

Commonly used in residential and light commercial hydronic heating systems, the ZVC404-4 is compatible with both normally closed and normally open zone valves. It interfaces directly with 24V thermostats and is often used in conjunction with indirect water heaters, baseboard zones, and radiant loops requiring individual zone control.