The central air conditioning unit in the office occasionally experiences a leakage issue during operation.

Leaking is actually a common issue, primarily caused by five categories: installation, insulation, drainage, equipment, and environment. Specific reasons and impacts are as follows:

One,Central Air Conditioning in the OfficeInstallation and Construction Issues (accounting for approximately)50%）

Insufficient Slope in Condensate Drain Pipe

- The standard slope should be ≥1%. Insufficient slope or excessive pipe length can lead to condensate backflow and accumulation, eventually causing overflow.

- Typical Indicators: Severe leakage in areas away from the main server room, with localized ceiling ponding.

2. Indoor Unit Misalignment or Tilt

During installation, the unit was not leveled properly (horizontal deviation > 1°), resulting in condensate in the water collection tray not being able to flow smoothly into the drain pipe.

- Case: Fixed panel loose and shifted, drainage pipe elevated on one side, creating a reverse slope.

Pipe connections are not sealed

- The clamp at the connection between the drain pipe and indoor unit is not tightened properly, or the joint is not sealed with adhesive, resulting in condensate seeping out through the gap.

Two,Central Air Conditioning in the OfficeInsulation System Defects (accounting for approximately)30%）

Insufficient insulation on copper piping

Insulation around copper pipes is not fully wrapped (especially at bends and valves), or low-quality/thin materials (thickness < 15mm) are used, leading to condensation on the low-temperature copper pipes when exposed to air.

- Impact: Ceiling displays pinpoint or linear water leakage stains.

Insulation Missing on Drain Pipe

- The condensate pipe temperature is low; if left exposed, the pipe walls will condense water droplets that may drip. Some projects omit this step to save costs.

Insulation damage at the wall penetration area

Insulation material was compressed and damaged during the pipeline wall penetration, resulting in a loss of coldness and condensation formation.

ThreeCentral Air Conditioning in the OfficeDrainage system blockage (accounting for approximately)15%）

Condensation pipe clogged with dust and algae, restricting water flow, causing overflow of the water collection dish.

2. Drain outlets clogged with debris, a common issue in fan coil unit drip trays

3. Drain pipes without vent holes, air blockage in long pipes (＞8m) leading to backflow

FourCentral Air Conditioning in the OfficeEquipment aging or failure (accounting for approximately)5%）

The drip pan is damaged.

- Plastic aging and cracking, or being stepped on during installation, can cause condensate to leak directly.

Refrigerant Leak

Deficiency of refrigerant caused the evaporator to freeze, resulting in a sudden increase in condensate water during defrosting, which overflowed due to insufficient drainage.

Filter Screen Long Overdue for Cleaning

Dust accumulation hinders airflow, causing the evaporator surface temperature to drop excessively, leading to increased condensation beyond the drainage capacity.

Five.OfficeEnvironmental and Usage Factors

High humidity levels

During the southern plum rain season or when the office is crowded, condensation may form on the air outlet (not a fault, adjust the air temperature upwards).

2. Poor Window and Door Sealing

Outdoor humid air influx increases the air conditioning load and enhances the risk of condensation.

3. Human Error Adjustments

- Low air supply temperature settings (e.g., <18℃) or insufficient air velocity can exacerbate condensation.