Evaporator, condenser and dry cooler testing

At HOS BV we’re committed to delivering used refrigeration equipment you can rely on. Our evaporators, condensers, and dry coolers meet the highest standards of reliability and efficiency. For all types of refrigeration equipment, HOS BV uses various test protocols and quality standards. We also provide detailed insights into our compressor and chiller testing procedures. Keep reading to get a glimpse into how we maintain our high-quality benchmarks across all evaporators, condensers and dry coolers we offer.

How we test evaporators

How we test evaporators, condensers and dry coolers:

  • Visual examination of the unit
  • Weld or seal the pipes closed from the coil in order to test
  • The coil is pressurized to test for leakage
    • with nitrogen for freon and ammonia units
    • with compressed air for glycol units
  • Electric measurement (Megger) testing of the fans, and if installed, the defrost elements
  • Voltage is applied to the fans / defrost elements
  • Fans are mechanically tested and worn bearings are replaced if necessary
  • Industrial cleaning
  • Visual touch-ups if necessary or if requested by the client
  • Machine gets packaged for safe transport

Visual inspection

First, we thoroughly examine the unit to identify any visible signs of wear and tear. This step helps assess the overall condition of the unit.

Seal pipes

After the visual inspection, we ensure that all connected pipes are securely sealed. For freon and ammonia units we weld the pipes shut. For glycol coolers and dry coolers, we close them with a sealing flange. This prevents any potential leaks during the testing process and helps maintain the system's integrity.

Pressurize coil

Then we pressurize the coil. We use nitrogen for freon and ammonia units to pressurize the coil and check for leaks. For glycol units, compressed air is used instead. This procedure ensures the gas tightness of the coil.

Pressurize coil
Electrical testing

Electrical testing

We perform a Megger test. The Megger device is used to test electrical resistance and insulation. Meggers use a high-voltage, low-current DC charge that measures the resistance within wires and motor windings to identify current leakage and faulty or damaged insulation. If present, the defrost elements also get a Megger test.

Apply voltage to fans and defrost elements

The next step is to energize the fans with the appropriate voltage. This step verifies the functionality of these components and ensures they operate as intended. We replace worn bearings on the fans if necessary to prevent future issues and maintain the unit's efficiency.

The final steps

When a machine passes all the quality checks, it gets sent to our washing station to get an industrial cleaning. If necessary or when requested by the client, we perform visual touch-ups on the unit to enhance its appearance. When the evaporator, condenser, or dry cooler looks how the client wants it to look, it is packaged for safe transport.