Johnson Controls VAV Boxes
Johnson Controls VAV terminal units deliver precise airflow control, efficient operation, and advanced digital integration capabilities for optimized zone comfort in commercial buildings.
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Popular Models
Technical Specifications
Capacity & Efficiency
Airflow & Pressure
Dimensions
Power Requirements
Common Issues & Solutions
Controller communication loss
Symptoms:
VAV box offline in BAS, local control only, default operation mode, error indicators on controller
Solution:
Verify network wiring polarity and connections, check addressing and baud rate settings, inspect for network wiring damage or interference, test communication voltages, replace network interface module if faulty.
Damper binding/sticking
Symptoms:
Inconsistent airflow control, noise at certain positions, actuator strain, poor response to setpoint changes
Solution:
Inspect damper shaft and bearings for binding, lubricate moving parts if applicable, check for obstructions in damper path, verify proper actuator mounting and linkage, adjust mechanical stops if necessary.
Terminal temperature sensor failure
Symptoms:
Erratic temperature readings, constant calls for heating/cooling, comfort complaints, sensor error codes
Solution:
Verify sensor resistance against temperature curve, check wiring for shorts or breaks, confirm proper location away from drafts or heat sources, replace sensor and recalibrate system if readings are inconsistent.
Cost Information
| Service | Average Cost | Cost Factors |
|---|---|---|
| Controls retrofit on existing box | $1,200-$2,800 | Controller type, integration requirements, existing controls removal, commissioning scope |
| Fan assembly replacement (fan-powered VAV) | $900-$2,000 | Motor type (ECM/PSC), fan size, accessibility, control requirements, balancing needs |
| Site survey and balancing | $200-$500 per box | Testing points, documentation requirements, adjustments needed, verification scope |
| New VAV installation with controls | $2,500-$6,000 | Box type/size, reheat option, control package, installation complexity, commissioning |
Frequently Asked Questions
What distinguishes Johnson Controls VAV boxes in the market?
Johnson Controls VAVs feature patented AccuValve technology with linear flow characteristics, maintenance-free mechanical components, digital controllers with advanced diagnostics, multiple configuration options for retrofits, and industry-leading turndown ratios allowing precise control from 5-100% of maximum flow.
How do Johnson Controls VAV boxes enhance energy efficiency?
Johnson Controls VAVs improve efficiency through precise flow control that reduces reheat energy, patented 'Continuous Commissioning' algorithms that detect and correct issues, low-pressure drop designs, ECM motors in fan-powered models, and advanced sequences compatible with demand-based pressure reset strategies.
What control options are available with Johnson Controls VAV terminals?
Johnson Controls offers several control options including factory-mounted VAV controllers (Metasys, HVAC PRO), BACnet MS/TP or IP communication, wireless options with SA bus, field-selectable applications, programmable sequences, and seamless integration with Metasys building automation for system-wide optimization.
How are Johnson Controls VAV boxes designed for improved installation and maintenance?
Johnson Controls VAVs feature snap-in control modules for quick replacement, tool-free access panels, universal mounting brackets, clearly labeled wiring terminations, removable reheat coil assemblies, multiple actuator mounting positions, and factory-commissioned controllers that minimize startup time.
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