VAV (Variable Air Volume)
VAV (Variable Air Volume) is a type of air conditioning system commonly used in commercial buildings to control indoor temperature. Think of it like a smart air distribution system that can adjust how much cool or warm air goes to different areas of a building based on need. Unlike older systems that can only be turned on or off, VAV systems can vary the amount of air flowing to different spaces, making them more energy-efficient and comfortable. It's similar to having a dimmer switch instead of just an on/off switch - you can adjust the level to exactly what you need.
Examples in Resumes
Maintained and serviced VAV boxes and Variable Air Volume systems in 15+ commercial buildings
Supervised installation of 50+ VAV units in a new office complex
Performed troubleshooting and calibration of Variable Air Volume controllers and sensors
Typical job title: "VAV Technicians"
Also try searching for:
Where to Find VAV Technicians
Professional Organizations
Online Communities
Job Resources
Example Interview Questions
Senior Level Questions
Q: How would you approach troubleshooting a VAV system that's causing temperature complaints across multiple zones?
Expected Answer: A senior technician should describe a systematic approach: checking the building automation system for alerts, verifying airflow sensors and thermostats, examining VAV box operations, and checking the main air handler. They should also mention the importance of reviewing trending data and maintenance history.
Q: How do you plan and manage a large VAV system replacement project?
Expected Answer: Should discuss coordination with building owners, creating detailed schedules to minimize disruption, ensuring proper equipment sizing, managing contractors, and implementing proper testing and commissioning procedures.
Mid Level Questions
Q: What are the common maintenance requirements for VAV systems?
Expected Answer: Should describe regular checks of dampers, actuators, and sensors, calibration procedures, filter changes, and the importance of keeping controls properly programmed and calibrated.
Q: How do you balance a VAV system?
Expected Answer: Should explain the process of measuring and adjusting airflow to ensure each zone gets the right amount of air, using testing and balancing equipment, and making necessary adjustments to dampers and controls.
Junior Level Questions
Q: What are the basic components of a VAV box?
Expected Answer: Should identify main parts like the damper, actuator, thermostat, and flow sensor, and explain their basic functions in simple terms.
Q: What safety procedures do you follow when working on VAV systems?
Expected Answer: Should mention basic safety practices like proper lockout/tagout procedures, using personal protective equipment, and following electrical safety guidelines.
Experience Level Indicators
Junior (0-2 years)
- Basic VAV box maintenance
- Reading building blueprints
- Using basic testing equipment
- Following safety procedures
Mid (2-5 years)
- Troubleshooting complex VAV issues
- Working with building automation systems
- System balancing and calibration
- Preventive maintenance planning
Senior (5+ years)
- Project management
- System design and optimization
- Energy efficiency analysis
- Team leadership and training
Red Flags to Watch For
- No knowledge of basic HVAC principles
- Lack of proper certifications or licenses
- No experience with building automation systems
- Poor understanding of safety protocols
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