Taco®, ZVC406-EXP-4, Zone Valve Control Module, 6, 120 V

Taco ZVC406-EXP-4 – Six-Zone Valve Control with Expansion Capability

The Taco ZVC406-EXP-4 is a six-zone valve control panel designed for managing 24V zone valves in hydronic heating systems. This model includes integrated priority functionality and is expandable for up to 20 zones using additional -EXP control panels. Engineered for system flexibility, it supports two-, three-, and four-wire zone valves and offers features that simplify installation, diagnostics, and future upgrades.

Key Product Features

• Six-Zone Capacity: Controls up to six independent heating zones
• EXP Bus Expansion Port: Allows connection to additional Taco EXP panels (up to 20 zones total)
• LED Indicators: Provides clear diagnostics for zone calls and valve actuation status
• Two Isolated End Switches: Independent dry contacts for boiler and system pump activation
• Contractor-Friendly PC Board Layout: Simplifies field wiring and identification
• Switchable Priority Zone: Allows designated zone (e.g., DHW) to override heating zones when required
• Universal Thermostat Compatibility: Works with both mechanical and digital thermostats
• UL Listed and Fuse Protected: Built to meet industry safety and durability standards

Technical Specifications

• Model: ZVC406-EXP-4
• Input Voltage: 120 VAC
• Zone Outputs: Six 24V terminals for zone valve actuation
• Thermostat Inputs: Six low-voltage inputs
• End Switch Outputs: Two isolated dry contacts (24V)
• Transformer: Field-replaceable internal transformer
• Compatibility: 2-, 3-, or 4-wire zone valves
• Expansion: Supports additional ZVC-EXP panels via RJ45 bus connection

Installation Notes

The ZVC406-EXP-4 is designed for wall-mount installation in residential and light commercial hydronic heating systems. It provides simplified wiring for multiple zone valves and streamlines connections to thermostats and boiler end switches. All terminals are clearly labeled, and diagnostic LEDs aid in system setup and troubleshooting.

Application Considerations

This control panel is suitable for baseboard, panel radiator, radiant floor, and other hot water distribution systems requiring multiple zone control. It can be integrated with Taco SR relay panels and zone synchronizing modules to support mixed pump and valve systems or complex zoning strategies.