In shortIn freeze drying the product is frozen and its ice is removed under vacuum by sublimation. The vapour is captured on an ice condenser kept very cold, typically between −50 °C and −85 °C. The refrigeration system cools both the shelves and the condenser, so most units have two-stage or cascade circuits.
Role of refrigeration
- Freezing: cooling the shelf heat transfer fluid.
- Primary drying: keeping the condenser cold enough to capture vapour as ice.
- Secondary drying: controlled shelf heating while the condenser stays cold.
- Defrost: hot gas or water defrost of the condenser.
Common problems
- Condenser not reaching temperature (leak, cascade stage failure, dirty condenser)
- Vacuum not pulling down (vapour reaching the vacuum pump)
- Shelf temperature drifting (circulation pump, expansion valve, control)
- Oil return problems at low temperature
In GMP environments every intervention is documented, and qualification work is coordinated with the site quality team.
Maintenance, repair, installation and projects
- Scheduled maintenance: condenser and evaporator cleaning, compressor and oil checks, pressure and temperature measurements, safety device tests, measured report.
- Fault diagnosis and repair: not reaching set temperature, slow pull-down, high/low pressure alarms, compressor failure, leaks, control and sensor faults.
- Installation and projects: load calculation, system and refrigerant selection, compressor and heat exchanger selection, installation, commissioning and documentation.
- Retrofit and modernisation: conversion to new refrigerants, compressor overhaul, control upgrades, energy efficiency improvements.
We work brand-independent; refrigerant handling is done by F-gas certified technicians.
Our base is in Ankara Etimesgut. We work daily in Ankara and on a project and contract basis across Türkiye. Türkçe sayfa.
Frequently asked questions
Which brands do you service?
We work brand-independent, using the nameplate, circuit diagram and fault records for diagnosis.
Do you work outside Ankara?
Yes. We are based in Ankara and work across Türkiye on a project, contract and scheduled service basis.
Do you also design and install new systems?
Yes. We calculate loads, select the system and refrigerant, install and commission.