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This beginners course will establish your strong understanding of the basics

This Diploma will qualify you to be an invaluable practitioner in your industry

This Diploma will establish a great foundation in management as a Technician

  • Air Conditioning Diploma
  • Ammonia Certication
  • Ammonia Diploma

Welcome To


Open Trade Training Center

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 to the next level. Thank you.

Project Building

Fully Equipped


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.

Our Courses

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.

OTTC Practical Diploma Plants 2019

OTTC – Practical Diploma


Precondition: OTTC Beginners Program for Refrigeration & AC or equivalent to prior learning.For the perfect Technician for commercial refrigeration to do:New installations

OTTC – Technical Diploma


Preconditioning: OTTC Practical Diploma, or equivalent.For the supervisors, plant operators and plant designer.Including commercial and industrial refrigeration, secondary cooling and CO2 plants

OTTC Ammonia Training Plant

OTTC – Ammonia Diploma


OTTC Ammonia Diploma Specialized program: for people working in ammonia, technician, supervisor, operator, and designer. Ammonia Industrial Plants are used for

Courses are being updated


The courses are being updated. Click on our "CONTACT" tab for us to send you the updated info as it happens

Upcoming Events

  Keep updated with these events from our Calendar ……..

World Skills – USA

Skills USA – National Leadership and Skills Conference 24-28 June 2019 Kentucky Exposition Center, Louisville, United States of America www.skillsusa.org    
Read More

June 24

Our Teachers

Our teachers are not only passionate about their job, they are also well qualified with a proven record in their ability to train and equip each student. They are purposed to assist you in achieving the qualification that will set you apart from your peers.


What's People Say?

Don’t take our word for it …

We had been struggling with getting some good Air conditioning technicians but OTTC has help to satisfy our need supplying us with some of the best placements we have ever had

Des Van Zyl

Managing Director

As a student I will always feel indebted to OTTC for their in depth knowledge that has catapulted me into the industry above my peers – in fact today I have joined OTTC as a teacher

Christian Richter

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.