Pre-Commissioning Checklist for Air Handling Unit

[Srinivasan]

Pre-Commissioning Checklist for Air Handling Unit

Checklist should have following points in it.

Pre-commissioning documentation required
Ductwork air leakage certificates
VFD startup test report
Fan start-up check sheets
Certified balancing report for chilled water and air for AHU
Certified balancing report for air distribution system without BMS/VAV in to operation
BMS I/O data schedule
BMS sequence of operation (cause & effect)
Controls pre-commissioning test report
Device calibration test sheets
Smoke damper check sheets

Visual Verifications
AHU Clean and free of debris
CHW & HTG coil fins combed
Pre & bag filters clean
Associated valve tags in place
Insulation complete in all respect.
AHU and all associated labeling completed

Functional Verifications
Verify calibration of all sensors and measuring equipments.
Check Manual and motorized damper positions on shutdown.
Check control valve positions on shutdown
Check AHU control panel operations.
Start system using manual & then BMS /Auto command

Hard Wired Safeties
Check operation , fan shutdown and BMS alarm annunciation
Check supply fan low suction and high pressure switches operation, fan shutdown and BMS alarm annunciation
Check fire alarm system smoke detector operation, fan shutdown and BMS alarm annunciation

Soft Wired Safeties
Check operation of bag and panel filter alarms
Check operation of low temp/minimum outside air control over-ride
Check temperature set point deviation alarm

Temperature Control
Verify shutdown mode of operation
Verify warm up mode of operation
Verify cool down mode of operation
Verify occupied mode of operation
Verify return from warm-up mode of operation
Verify enthalpy override
Verify freeze prevention mode of operation
Verify operation of start time optimization

Testing & balancing
Check motor overload setting, amperage each phase and volts Operate fans at design conditions.
Check volume flow rate and static pressure. Plot on curve
Check operation of minimum outside air control sequence. Measure outside air quantities and verify operation of reset schedule
Check CFM at a random 10% of supply, return and exhaust grilles

 

[paxtenhart]

Ensuring a comprehensive pre-commissioning checklist is crucial for AHU performance. Beyond the standard documentation and visual verifications, integrating functional and safety checks early can prevent downtime. Verifying sensor calibration, damper positions, and control valve responses before full operation often reveals issues that might be missed during normal commissioning.

For practical guidance, professional Aircon Servicing teams in Singapore often provide detailed step-by-step support for both documentation and on-site verifications. Their expertise covers everything from VFD startup tests to testing and balancing of airflow, ensuring the AHU operates efficiently and safely. You can visit here to review the type of services and support they provide, which can complement your internal pre-commissioning process.

Adopting this structured approach reduces post-installation adjustments and ensures that safety interlocks both hard and soft wired, function reliably from day one. This method has proven effective in large commercial buildings where maintaining precise air distribution and temperature control is critical.