Product Short Description

Product Overview

Fully programmable IP-native web-enabled HVAC logic controller under Honeywell MVCWEB building automation product line, certified BACnet B-BC building controller for commercial and light industrial heating, ventilation and air conditioning systems. Equipped with dual Ethernet ports, multi-protocol communication stack and embedded web server for remote browser-based programming, monitoring and fault diagnosis without dedicated proprietary configuration software. Model MVC-WEB-2026B3A features expanded I/O capacity and advanced energy management logic libraries compared to base MVCWEB models.
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Honeywell MVC-WEB-2026B3A
Honeywell MVC-WEB-2026B3A - Image 2

Description

Technical Core Specifications

  • Main Processing Unit: Industrial ARM real-time multitasking CPU
  • Embedded Storage: Flash memory for user control logic programs + backup coin cell real-time clock memory
  • Communication Interfaces

    Dual 10/100Mbps Ethernet RJ45 ports (LAN1 / LAN2)

    RS-485 MS/TP BACnet field bus port with configurable termination bias jumpers

    Native BACnet IP, BACnet MS/TP, LonWorks multi-protocol stack

  • I/O Configuration: Configurable analog input, digital input, relay digital output and analog voltage output terminals for direct HVAC sensor/actuator connection
  • Power Supply Input: 24 VAC 50/60Hz low voltage safety extra low voltage supply
  • Physical Mounting: Standard DIN rail indoor cabinet mounting, wall-mount optional via accessory bracket MVC-80-AC1
  • Operating Ambient Temperature: 0°C ~ +50°C continuous indoor cabinet operation
  • Humidity Tolerance: 5%RH ~ 95%RH non-condensing
  • Pollution Degree Class: Pollution Degree 2 per EN 60730 safety standard
  • Protection Class: Shock Protection Class II, IP30 cabinet installation rating

Functional Features

  1. Embedded lightweight web server enables full controller configuration, real-time data trending, alarm management and program upload/download via standard web browsers
  2. BACnet B-BC official certification supports peer-to-peer communication with all third-party BACnet-compliant HVAC field devices without central server mediation
  3. Pre-programmed standard HVAC control logic libraries including PID temperature regulation, air handling unit economizer control, demand load limiting, night purge ventilation and lighting scheduling
  4. Dual Ethernet port architecture supports redundant network communication or separate IT corporate network and building automation control network segmentation
  5. Configurable RS-485 MS/TP bus for connecting legacy Honeywell VAV terminal controllers, temperature sensors and damper actuators
  6. Built-in historical data trending storage for supply air temperature, return air humidity, fan runtime and chilled water flow metrics
  7. Graded alarm classification system with timestamped fault logging for filter blockage, supply fan failure, low supply air temperature and actuator positioning faults
  8. Backup coin cell maintains real-time clock and scheduled control logic for up to 14 days during 24VAC mains power loss

Material & Structural Composition

  • Outer Enclosure: Lightweight flame-retardant gray ABS plastic DIN rail housing with horizontal ventilation slotted panels
  • Main Circuit PCB: Double-sided industrial printed circuit board with humidity-resistant conformal coating
  • I/O Terminal Blocks: Removable plug-in screw-clamp terminals for sensor and actuator wiring connection
  • Network Interface Section: Shielded RJ45 Ethernet ports with integrated link/activity status LED indicators
  • Mounting Hardware: Standard 35mm DIN rail spring locking clip with anti-slip safety retention latch
  • Internal Power Regulation: Low-noise isolated AC-DC power conversion circuit to supply CPU and communication peripherals

Working Principle

24VAC safety extra low voltage power supplies internal CPU, communication circuits and on-board I/O terminal circuitry. The controller continuously scans all connected analog temperature/humidity sensors and digital equipment status inputs at configurable sampling intervals. Embedded real-time CPU executes user-programmed control logic and pre-built HVAC algorithm libraries to calculate required output signals for fan relays, chilled water valve actuators and air damper positioning drives. Process data, alarm events and real-time operating parameters are cached in onboard flash memory and accessible via the embedded web server over Ethernet IP networks. The integrated multi-protocol communication stack exchanges measurement and control data with upstream Metasys supervisory servers and downstream MS/TP field terminal controllers simultaneously. Jumper-configurable RS-485 bias resistors optimize bus signal integrity for long-distance field wiring runs.

Installation Requirements

  1. Install exclusively inside lockable electrical control cabinets with minimum IP54 environmental protection rating
  2. Vertical DIN rail mounting mandatory; horizontal installation blocks ventilation slots and causes thermal overheating
  3. Reserve minimum 20mm vertical clearance above and below controller housing for natural convection cooling airflow
  4. Separate 24VAC power wiring from RS-485 MS/TP field bus cabling by minimum 8cm distance to reduce electrical noise interference
  5. Use shielded twisted pair CAT5e Ethernet cable for all IP network connections with single-point cabinet earth shielding termination
  6. Adjust RS-485 bus termination jumpers only at the physical two far-end devices on the MS/TP wiring trunk

Application Scenarios

Commercial office building air handling unit control, retail shopping mall VAV zone HVAC regulation, hotel guest room ventilation and temperature control, school campus classroom air conditioning systems, warehouse energy-efficient ventilation management, small data center precision cooling supervision, restaurant kitchen exhaust fan interlock control

Operation & Maintenance Notes

  1. Conduct semi-annual firmware upgrade via embedded web interface to update BACnet protocol compatibility and energy optimization algorithm patches
  2. Clean cabinet ventilation filter screens monthly to prevent dust accumulation blocking controller cooling slots
  3. Avoid mounting within 1 meter of variable frequency fan drives or high-current contactors generating strong electromagnetic noise
  4. Replace internal backup coin cell every 5 years to prevent loss of real-time clock and scheduled control logic during power outages
  5. Export archived historical trend data quarterly via web server to external storage for building energy consumption audit records
  6. Disconnect 24VAC power supply before removing plug-in I/O terminal blocks to eliminate short-circuit wiring hazards

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