TCHAIN Rain Test: Ensuring IP67 Waterproof Performance for Global Bus Fleets

At TCHAIN (Foshan Shunde Taichang Vehicle Technology Co., Ltd.), quality is engineered into every bus air conditioner we build. As a 39-year industry leader and designated supplier to Yutong, King Long, BYD and CRRC, we never compromise on reliability. Our dedicated Rain Test Room is a core part of our ISO 9001:2015 certified quality control process, designed to validate the waterproof integrity of every unit before it leaves our factory.

Our purpose-built Rain Test Room simulates real-world rainfall conditions to guarantee long-term durability

Why Waterproof Testing Is Non-Negotiable for Bus ACs

Installed on bus roofs, air conditioning systems are constantly exposed to heavy rain, driving storms, road splash and high humidity. Even a small water leak can cause:

• Electrical failures in ECUs, wiring harnesses and control panels

• Corrosion of compressors, heat exchangers and metal components

• Increased maintenance costs and unexpected fleet downtime

• Safety hazards for passengers and drivers

Our rain test aligns with international IP (Ingress Protection) standards, specifically validating the IP67 waterproof rating featured on our flagship electric bus AC series. This ensures our units perform flawlessly in tropical monsoon regions, coastal areas and high-humidity climates across Southeast Asia, the Middle East, Europe and the Americas.

TCHAIN’s 6-Step Standardized Rain Test Process

Our Rain Test Room is equipped with precision-controlled spray systems that replicate static and dynamic driving conditions. Every unit undergoes this rigorous process:

Step 1: Real-World Mounting Preparation

The fully assembled AC unit is mounted on a test platform exactly as it would be installed on a bus roof. All brackets, seals and connection points match field installation standards to eliminate test discrepancies.

Step 2: Climate-Specific Parameter Calibration

Technicians calibrate the spray system to match your market’s conditions:

• Rainfall intensity: Light rain (1-3 mm/min) to severe storms (10-15 mm/min)

• Spray angle: Vertical (static rain) and 0-45° (driving rain at highway speeds)

• Water pressure: Replicates real-world impact forces

Step 3: Continuous Multi-Condition Testing

Units are subjected to:

• Standard test: 1 hour of heavy rain simulation

• Enhanced test: 2-3 hours of continuous storm simulation for extreme climate markets

• Dynamic test: Platform tilting and vibration to simulate uneven road conditions

Step 4: Immediate Internal Inspection

Right after the spray cycle, engineers disassemble critical components to check for any water ingress:

• Electrical compartments and junction boxes

• Compressor and motor housings

• Heat exchanger cavities and seal joints

Step 5: Full Functional Performance Verification

We power on the unit and run complete tests to confirm:

• Cooling and heating output meets specifications

• Fan speed and electronic controls operate normally

• Refrigeration system remains fully sealed

Step 6: Documentation & Final Approval

All test data is recorded in a detailed report. Only units that pass every stage proceed to packaging and shipment. Any unit with water ingress is sent back for design refinement and retesting.

Our Commitment to Quality

Unlike manufacturers that only test sample units, 100% of TCHAIN bus air conditioners undergo rain testing. Our protocols exceed industry standards and comply with CE, ISO and global certification requirements. This is why our units deliver up to 10+ years of reliable service in the harshest environments.

Explore Our Reliable Bus AC Solutions

Browse our full range of rigorously tested bus air conditioners:

• 6-7M Electric Bus Air Conditioner TCD07A

• 8-8.5M Electric Bus Air Conditioner TCD08D

• 12-13M Double-Decker Bus AC TC45N2

• Bus Air Conditioner Spare Parts

To learn more about our testing processes or request a customized quote for your fleet, contact our global team at export02@sdtaichang.com. We are ready to provide engineered climate control solutions for your buses.