Domestic to Commercial Changeover Course

What's included?

CODNCO1 + appliances, ACS – LOGIC Accredited
Duration: up to 5 days
Cost: £1350+VAT


This course is designed for Domestic Gas Engineers with a current ACS qualification who wish to work on non-domestic gas installations and commercial heating and hot water appliances.

Proof of initial Domestic Gas qualifications (CCN1) must be provided in order to undertake this course.

CODNCO1 is a suitable changeover and  is required for any operative wishing to work on non-domestic gas installations and commercial heating and hot water appliances. In addition, the operative must hold the relevant appliance element to the work they wish to undertake.

CODNCN1 - Domestic to Commercial Changeover

The course includes training on the following:

  • Installation requirements for commercial gas pipework
  • Commercial chimney requirements and Clean Air Act
  • Ventilation requirements for commercial appliances in different locations
  • Combustion analysis including NOx and SOx
  • Operation of forced draught burners
  • Commercial appliance and pipework controls
  • Strength testing, tightness testing and purging of commercial gas pipework

Which appliance modules are included?

The assessment includes practical taks and multiple choice question papers on the following modules:

  • ICPN1 Installation First Fix on Commercial Pipework
  • CIGA1 Indirect Fired Commercial Appliances
  • CDGA1 Direct Fired Commercial Appliances
  • CORT1 Overhead Radiant Tube & Radiant Plaque Heaters
  • TPCP1a Tightness Testing & Direct Purging of Pipework not exceeding 1m³ in volume or 6″ in diameter

For more details on the individual modules click here.

How will you be assessed?

Assessment is carried out using a variety of methods, including multiple choice, short written response, scenario questions and observed practical assessment.

What happens next?

The CODNCO1 core commercial gas safety certificate has an equivalence to a Level 3 qualification and satisfies the same criteria leading to a certificate of competence recognised by the Gas Safe Register.