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AC for beginners

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Try a Trade

The outcome is to motivate school leaver and beginners to work in the trade of refrigeration, air conditioning and plumbing learning hand skills and using tools.

AC for beginners

The outcome gives you great understanding being an assistant for first year apprenticeship. 

Practical Diploma

The outcome is an advanced understanding in practical air conditioning and refrigeration

Technical Diploma

The outcome is a perfect technician for installing new plants as well as repairing, faultfinding and maintenance for commercial refrigeration plants

AC Diploma

The outcome is for supevisiors and companey owner as well as designers, designing their own plants for special applications on commercial and industrial refrigeration

Ammonia Diploma

The outcome of the ammonia diploma is for operators, supervisors and designers working in the field of ammonia refrigeration

Try a Trade

Two weeks free training for school leavers to get motivated working as an artisan.

AC for beginners

The program is designed for the first year apprenticeship. The outcome is a perfect assistent working efficiently with the Technician and is an asset to be employed.

Practical Diploma

New installations on cold rooms and refrigeration plants, Servicing maintenance, repair, faultfinding, improvements for energy savings.

Technical Diploma

For the supervisors, plant operators and plant designers. Including commercial and industrial refrigeration, secondary cooling and CO2 plants.

AC Diploma

For technicians, supervisors and designers working in the Air-Conditioning industry for heating and cooling on central Air-Conditioning plants.

Ammonia Diploma

For pleaple working in ammonia. Technicians, supervisors, operators and designers. Ammonia industrial plants are used for cold stores, dairies, breweries.

Welcome To


Open Trade Training Centre

Open Trade Training Centre (OTTC) is a leading training provider of commercial and industrial refrigeration, and air-conditioning training in South Africa. Founded in 1992 by Peter and Isolde Döbelin to address the shortage of vocational skill training in the South African refrigeration and air-conditioning industry, the company’s mission is to transfer relevant technical knowledge and work skills to workers, practitioners, entrepreneurs and employers alike.

Today OTTC is renowned for its training excellence locally, internationally and in the neighboring countries. Close to five thousand participants have attended the popular industrial refrigeration training courses at OTTC in Springs, South Africa.

For many years now the German international standards have been found renowned as some of the highest in the world. We at OTTC have chosen to support these values and standards and implement them into our curriculum.

The OTTC team and Isolde Döbelin would like to say thank you for your generous sponsorships to build a German-standard CO2 refrigeration training plant. With your contribution and Christian Richter’s expertise we can transfer German-standard technology to our students. This has brought the OTTC training centre to the next level. Thank you.


Check out our courses, what do you have to lose?

Please see founder and director Isolde Dobelin on Linkedin and Facebook:

Our Courses

All OTTC courses are practical as well as theoretical.

Our courses offer a good compromise between the continuous academic knowledge and the practical (Technical) application of that knowledge so that our students are well rounded in their understanding. In fact, we have had many students placed in the industry directly because of their acknowledged skills.

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Please feel free to browse around and look at all of OTTC.

We are the best in the business and would like for you to join us.

We hope you have a special and great day.

Please rate our site and leave a review of your experience with OTTC as a whole.


Project Building


Fully Equipped

unique projects

Unique Projects


World Skills

Project based education

Developing our skills together

The OTTC family of educators encourages each student to team up all the while enjoying project work. We want all our students to walk away proudly having learned and achieved the goals we set together.

27 years of OTTC

We work hard to prepare every student for their profession

Our courses offer a knowledgeable and practical  approach  to providing our students the best opportunity to excel in their respective industries. 

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