Description
The Honeywell AQ25042B is a 4-zone boiler control panel engineered for reliable, precise hydronic heating management in residential and light commercial applications. Designed for use with AQ1000 2-wire thermostats, this panel simplifies multi-zone wiring and commissioning while delivering robust boiler sequencing and protection features.
Key Features
- 4-zone boiler control with intuitive dip switch configuration
- Compatible with AQ1000 2-wire thermostats for simplified low-voltage wiring
- 30-second boiler heat post-purge cycle for improved efficiency and equipment protection
- 24 Vac R-C thermostat input for standard compatibility
- Low-voltage B-B communication bus terminals for easy system integration
- Low-voltage zone module thermostat input
- 120–240 Vac ZR-Z power input for broad voltage compatibility
System Compatibility & Design
The AQ25042B integrates seamlessly into hydronic heating systems using the AQ1000 2-wire thermostat platform, reducing installation complexity and minimizing field wiring. The dip switch configuration allows technicians to quickly set zone parameters without additional programming tools, making commissioning fast and straightforward.
Post-Purge & Boiler Protection
The built-in 30-second boiler heat post-purge function helps dissipate residual heat after a call for heat ends, protecting the boiler from short-cycling and thermal stress while improving overall system efficiency.
Electrical Specifications
- Thermostat Input Voltage: 24 Vac (R-C)
- Zone Power Input: 120–240 Vac (ZR-Z terminals)
- Communication: Low-voltage B-B bus terminals
- Zone Thermostat Input: Low-voltage zone module
- Number of Zones: 4
Applications
- Residential and light commercial hydronic boiler systems
- Multi-zone hot water heating installations
- Retrofit and new construction boiler zoning projects
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