As the core equipment of a centralized air handling system, the construction quality of modular air conditioning units directly affects the stability, energy efficiency, and indoor air quality of the system.
To ensure that the unit meets design performance requirements after installation, relevant standards and technical specifications must be strictly followed during construction, covering aspects such as foundation acceptance, equipment placement, piping connection, electrical wiring, and commissioning.
Before construction, a comprehensive acceptance inspection of the civil engineering conditions of the equipment room should be conducted. The foundation dimensions, elevation, and levelness should meet the requirements of the design drawings, and the concrete strength must meet the equipment installation standards. The foundation surface should be flat and free of cracks, and the pre-drilled anchor bolt holes should be accurately positioned to ensure stable installation of the unit. Simultaneously, the equipment model and specifications should be verified to match the packing list, and any transportation damage should be checked to ensure that all accessories and documentation are complete.
Equipment placement is a crucial step in construction. Appropriate lifting equipment should be used to place the unit stably on the foundation, aligning it with the anchor bolts according to the design orientation. After initial fixing, levelness and verticality should be adjusted using shims, with errors controlled within the allowable range specified in the standards. Vibration isolators or rubber pads should be installed between the unit and the foundation to reduce the transmission of operational vibrations to the building structure. After leveling and alignment, anchor bolts can be tightened and secondary grouting performed.
Pipe connections must ensure tightness and continuous insulation. When connecting hot and cold water pipes, steam pipes, and condensate pipes to the unit interface, impurities and burrs should be removed. Flanges or threaded connections should be used, and suitable sealing materials should be used to prevent leaks. Flexible joints should be used for connections between air ducts and the unit's air inlet and outlet to avoid vibration transmission and noise coupling. All insulation layers should be continuously and completely constructed, with waterproof and moisture-proof treatment at joints to prevent heat loss and condensation.
Electrical wiring must comply with current electrical installation specifications. Power lines and control lines should be correctly connected according to the wiring diagram, with conductor cross-sectional area matching the protective device, and reliable grounding. Wiring inside the control cabinet should be neat and clearly labeled, with strong and weak current lines laid separately to avoid electromagnetic interference. After wiring is completed, insulation resistance testing and phase sequence verification should be performed to ensure correct motor rotation.
System commissioning and acceptance are the final quality control steps in construction. The operational status of each functional section needs to be checked, and the accuracy of airflow, air pressure, temperature and humidity control, and automatic control logic tested. The reliability of safety protection devices must be verified. During commissioning, operating parameters should be recorded and compared with design requirements; any deviations should be adjusted promptly. Only after all tests are passed can handover procedures be completed, and as-built documentation and an operation and maintenance manual compiled.
During construction, a quality responsibility system must be adhered to. Each completed process must be inspected and accepted by the supervisor or owner's representative, and key milestones should be documented with photographic evidence and inspection records. Strict adherence to construction standards can minimize rework and operational failures, laying a solid foundation for the long-term, efficient operation of the combined air conditioning unit.
