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30 November 2020
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Welcome To

Open Trade Training Centre

Open Trade Training Centre (OTTC) is a leading training provider of commercial and industrial refrigeration. Also air-conditioning as well as Ammonia in South Africa. OTTC Refrigeration is known in many neighboring countries as well as and including all of South Africa.

Peter an Isolde Döbelin

Peter and Isolde Döbelin founded OTTC in 1992.

Their dream was to address the shortage of vocational skills training in the South African refrigeration and air-conditioning industry.

Therefore OTTC’s mission is to transfer relevant technical knowledge and work skills to workers and practitioners also entrepreneurs and employers alike.

Today OTTC is renowned for its training excellence locally as well as internationally and also in the neighboring countries.

Over five thousand participants have attended our popular industrial refrigeration and air-conditioning training centre in Springs, Gauteng, South Africa.

German Standards

For many years now German international standards are renowned to be of the highest in the world.

We at OTTC have chosen to support these values and standards and therefore have implemented them in our curriculum. 

We have also redesigned the Refrigeration Diploma Course according to these standards.

An OTTC refrigeration course is the first step in furthering your education.

Our training also caters for the National South African Trade Test and NQF Standards which will be included into these programs.

We would also like to start a pilot program with unemployed young engineers and school leavers.

Part of this program is the OTTC Ammonia Diploma course to upgrade unemployed engineers for the OTTC Ammonia Technician. 

Giving them a chance to find employment immediately.

Theoretical and Practical

The OTTC refrigeration courses are specialized for theoretical as well as practical training.

Refrigeration courses as well as ammonia courses at OTTC are presented with the highest quality learning material as well as the best lecturers.

We also have the best tailored air-conditioning training for air-conditioning services as well as duct cleaning and installation.

For more information please email us at

The OTTC team led by Isolde Döbelin would like to say thank you for your generous sponsorships.

With your contribution we have built a German-standard CO2 refrigeration training plant.

Open Trade Training Centre

Students learning and enjoying it!

Sponsor Companies

This and the OTTC lecturer’s expertise has enabled us to teach German-standard technology to our students.

You have helped bring the OTTC training centre to the next level.
Thank you.

OTTC Students and Staff
ammonia plant design

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

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

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

The outcome is for supervisors and company owners as well as designers, designing their own plants for special applications on commercial and industrial refrigeration

Ammonia course

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

ammonia plant design

The outcome of the ammonia plant design course is for a comprehensive study in ammonia plant design, designing a full ammonia plant on a theoretical bases.

ammonia plant design

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

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

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

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

Ammonia course

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

ammonia plant design

The outcome of the ammonia plant design is during your training at OTTC we will teach you how to design various complete refrigeration and cooling plants.

Sanitized and is safe from covid-19 to start training.

Sanitize Certificate

Enroll now!!

Isolde Dobelin(Owner/Director) Social Profiles

As of Monday the 1st of June we are open for training…

You can reach us via phone: 011 816 2580 or 011 366 1219

Email: or

Contact us page:

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Our Courses

Our courses offer a good compromise between practical and theoretical.

Workshop with plants

OTTC – Practical Diploma


Ask us for a quote now by clicking here or go to the contact us page. Click here to scroll to course pdf description


OTTC – Technical Diploma


Ask us for a quote now by clicking here or go to the contact us page. Click here to scroll to course pdf description

We work hard to prepare every student for their professional life

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

OTTC's great Ammonia courses

Kurt SH Class
Kurt Had a Full Safe Handling Class
Kurt SH Ammonia Plant
The Students Performed Excellently
Student in SH Class
Really Applying Themselves
Cascading CO2 Plant
Isolde Loves Refrigeration
Gidion's Practical Diploma
Full Workshop
Excellence Through Training


Developing our skills together

Our family of educators encourages each student to team up to enjoy project work as we want all our students to walk away proud.

To have learned and achieved the goals we set out together.

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.

Contact us now by clicking HERE:

Please follow our course pdf's here for info.

We Want To Say "Thank you!"

This “thank you” follows all of our students home and abroad and sends you the best of wishes – you have been both aspiring students and good people.

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