Popular Questions
Top HVAC controls engineering questions asked by our community
50 total Q&A entries
🆕 Top 10 Latest
What is ASHRAE Guideline 36 and how does it improve HVAC control sequences?
Standards
#ASHRAE-36#sequences#energy-efficiency
How do I select an actuator for airfoil vs. standard damper blades?
Air-side
#airfoil#damper#actuator
How do I measure pump efficiency using BAS data?
Hydronic
#pump-efficiency#measurement#BAS
What is the difference between fail-safe and non-fail-safe actuators?
Actuators
#fail-safe#spring-return#safety
How do I troubleshoot a hunting control valve?
Hydronic
#hunting#control-valve#troubleshooting
What are the minimum outdoor air damper leakage requirements in ASHRAE 90.1?
Standards
#ASHRAE-90.1#damper-leakage#outdoor-air
How do I select damper blade and frame material for corrosive environments?
Air-side
#damper#materials#corrosion
What is the optimal placement for a chilled water differential pressure sensor?
Hydronic
#differential-pressure#sensor-placement#pump-control
How does a differential pressure transmitter differ from a flow meter?
Hydronic
#DP-transmitter#flow-meter#measurement
What are the AMCA damper leakage classes?
Air-side
#AMCA-511#leakage#damper
📅 Top 10 This Month
BACnet vs Modbus — which protocol should I choose for building automation?
Controls
#BACnet#Modbus#protocol
What does ASHRAE 90.1 require for HVAC controls?
Standards
#ASHRAE-90.1#energy-code#compliance
What ventilation rates does ASHRAE 62.1 prescribe?
Standards
#ASHRAE-62.1#ventilation#IAQ
How do I calculate required outdoor air for a VAV multi-zone system?
Air-side
#VAV#ventilation#ASHRAE-62.1
What is a freeze-stat and where should it be placed?
Air-side
#freeze-stat#safety#coil-protection
Where should duct static pressure sensors be placed in a VAV system?
Air-side
#sensor-placement#static-pressure#VAV
How do I size an actuator for a large outdoor air damper?
Air-side
#damper#actuator#outdoor-air
What is the difference between Cv and Kv in control valves?
Hydronic
#Cv#Kv#control-valve
How does a series fan-powered VAV box work vs a parallel type?
Air-side
#VAV#fan-powered#terminal-unit
What temperature sensors should I specify for an AHU?
Controls
#sensor-placement#AHU#temperature
🏆 Top 10 All Time
How do I select the right damper actuator torque?
Air-side
#damper#actuator#sizing
What's the difference between parallel-blade and opposed-blade dampers?
Air-side
#damper#blade-type#selection
How do I size a control valve Cv for a chilled water coil?
Hydronic
#control-valve#Cv#sizing
What is valve authority and why does it matter?
Hydronic
#valve-authority#controllability#sizing
What is damper authority and how is it calculated?
Air-side
#damper-authority#controllability#sizing
When should I use a spring-return actuator vs a non-spring-return?
Actuators
#spring-return#fail-safe#safety
What is the difference between pressure-independent and pressure-dependent valves?
Hydronic
#PICV#pressure-independent#balancing
What flow sensor types are used in HVAC hydronic systems?
Hydronic
#flow-sensor#metering#measurement
How do I select a VAV terminal unit for a zone?
Air-side
#VAV#terminal-unit#sizing
BACnet vs Modbus — which protocol should I choose for building automation?
Controls
#BACnet#Modbus#protocol