Compressed air dryer service and repair

Refrigerant and desiccant dryers - the differences and typical faults

• Refrigerant dryers

  Dew point of about +3 degrees C, the standard in typical pneumatics. Most common faults: the refrigeration circuit (refrigeration compressor, refrigerant, fan), a non-working condensate drain and a fouled or leaking heat exchanger.

• Desiccant dryers

  Dew point of minus 40 degrees C or lower, for processes that need very dry air. Most common faults: worn desiccant, the column switching valves and the regeneration cycle control.

Desiccant dryers - classified by how the desiccant bed is regenerated

• Cold-regenerated (heatless)

  The desiccant bed is regenerated with part of the already dried compressed air, typically a low double-digit percentage of the flow. A simple and reliable design, typical for smaller and medium flows. Most common faults: switching valves, exhaust silencers, worn desiccant and the cycle controller.

• Heat-regenerated (with a heater, possibly with a blower)

  The desiccant bed is regenerated with hot air, so the compressed air used for regeneration is much lower, a cost-effective solution at larger flows. Most common faults: the heater, the blower, temperature sensors, valves and cycle control.

We service both types: regeneration cycle diagnostics, desiccant replacement, heater and valve repair and dew point verification after service. We also size new units, including Hertz HRD and HDA dryers from the Hertz Kompressoren range, for which we are an authorized distributor, as well as BEKO Technologies DRYPOINT RA and AC dryers.

What we do

• Dryer diagnostics and repair: measuring operating parameters, checking the refrigeration circuit, controls and switching valves.
• Periodic inspections combined with the compressor inspection, so one visit covers the whole compressor room.
• Desiccant replacement in desiccant dryers and regeneration cycle adjustment, to reduce the air used for purging.
• Heat exchanger cleaning and condensate drain repair, the most common cause of water in the line in a dryer that looks fine at first glance.
• Sizing a new dryer to the flow, pressure and required dew point when repair is not cost-effective, for both refrigerant and desiccant dryers.
• We complete the system with the right compressed air filtration and treatment because a dryer without proper filtration and separation cannot maintain the required air quality class.

For BEKO Technologies DRYPOINT dryers, we use original parts: BEKOMAT drains, dew point sensors, desiccant and CLEARPOINT filter elements. Parts for other manufacturers are selected by the equipment designation. See the full range of spare parts.