News Center
Your current location：Home > News CenterNews Center
Key points for quality control throughout the entire process of refrigeration machine room construction
2026/8/14
1. Pre-installation preparation and material/equipment acceptance
Technical briefing and drawing review: Verify the design drawings (such as pipeline layout, equipment positioning, electrical configuration, etc.), ensuring there is no conflict with the on-site structure, and clearly define the cooling load calculation and equipment selection to meet the requirements.
Equipment and material acceptance: Strictly check the product performance and technical parameters of the refrigeration equipment and its accessories to ensure they meet the design requirements. They must have product qualification certificates and product performance inspection reports. Inspect the purchased materials and equipment, and return or replace any non-compliant items.
Foundation acceptance and inspection: Conduct quality acceptance and inspection of the concrete foundation of the equipment. It is necessary to test the foundation strength (concrete condition-cured test block strength ≥ design value), dimensional deviation (height error ≤ ±5mm, flatness ≤ 2mm/m), and pre-installed parts position to ensure the surface of the foundation is flat and without cracks.
2. Quality control of core equipment installation
Installation of chiller units and compressors: Before equipment installation, check the position of the foundation and anchor bolt holes. During installation, keep the machine body stable and strictly prohibit exceeding the inclination angle or inversion specified in the equipment technical documents. For equipment fixed with anchor bolts, the position of the shims should be correct and in close contact, with no more than 3 shims per group; bolts must be tightened and anti-loosening measures such as double nuts or spring washers should be taken. The allowable deviation of the longitudinal and transverse levelness of the machine body should be strictly controlled (usually ≤ 1‰ or ≤ 2mm/m).
Installation of pumps and cooling towers: The pump installation should adjust the levelness to align with the centerline of the foundation, and the concentricity of the motor shaft and pump shaft should be ≤ 0.1mm. Pipe connections should be tight without leakage, and the flange surfaces should be flat. The cooling tower should be installed in a well-ventilated location away from heat sources to ensure uniform gaps between the fan blades and the fan housing, a horizontal error of ≤ 1/1000, and the installation accuracy of the water distributor should ensure uniform water distribution and smooth drainage.
Installation of auxiliary equipment and pipelines: The material, diameter, wall thickness, and working pressure of the refrigerant pipeline must meet the design requirements. The liquid pipe should not be installed in an "Ω" shape upward, and the gas pipe should not be installed in an "U" shape downward. When the branch pipe is led out, the liquid should be connected from the bottom or side of the main pipe, and the gas should be connected from the top or side. For horizontal equipment with oil tanks or oil discharge ports, it should slope towards the oil tank or oil discharge port side at a 0.2% gradient. Pipe connections should be made using welding, flanges, or threads to ensure tightness and no leakage. Before connecting the pipeline to the unit, the pipeline must be purged and cleaned.
3. Electrical and automatic control system installation
Power distribution and grounding: The power distribution box installation should be firm and reliable. The internal parts should be equipped with leakage, overload, etc. protection devices. Cable laying should be neat and aesthetically pleasing, avoiding crossing and twisting. The grounding resistance of the grounding system must comply with the regulations (usually ≤ 4Ω) to ensure the safe operation of electrical equipment.
Self-control system: The wiring of the DDC controller should be correct, and temperature and pressure sensors should be installed in the straight pipe sections that meet the requirements. The communication protocol should match the main unit, and the software parameters (such as start-stop logic, temperature difference control) should be set accurately.
4. System commissioning and trial acceptance
Piping test: After the installation of refrigerant and water system pipelines, strength, air tightness, and vacuum tests should be conducted according to the design requirements to ensure no leakage and compliance with pressure resistance standards.
Single machine and joint commissioning: First, conduct single-machine commissioning to check the oil level and refrigerant pressure of the chiller unit, and test the rotation direction of the compressor by manual operation; the pump should run without load for monitoring the bearing temperature rise and current. The water system should be flushed and discharged until there are no impurities in the outlet water, and the water flow balance adjustment (the deviation of each branch flow from the design should be ≤ 10%) should be carried out. During joint debugging, the refrigerant should be quantitatively charged according to the requirements of the unit (strictly prohibiting the direct discharge of excess refrigerant into the atmosphere), and gradually loaded up to 100% load to verify whether the measured cooling capacity and input power ratio (COP) is ≥ 90% of the design value.
Acceptance documents: After the debugging is qualified, complete acceptance documents (including operation data, graphs, pipeline pressure test records, equipment warranty documents, and operation training records) need to be compiled and submitted.
5. Quality Management System for the Entire Process
Establish a sound quality management system to strengthen quality control during the installation process. Conduct on-site supervision for key processes and important parts (such as equipment positioning, pipeline welding, system pressure testing, etc.). At the same time, strengthen technical training and safety management for construction personnel to ensure the safety of the construction process and environmental protection.
