TS 12355

TS 12355 is a service standard that sets out general rules for authorised maintenance services carrying out commissioning, repair and maintenance of gas combustion systems. Its focus is on how a competent technical service should bring such a system into operation, restore it when faults occur, and maintain it over time. Standards of this kind are useful for understanding the minimum organisational and technical order expected from the service provider.

What ‘authorised service’ means in this context

Gas combustion systems are assemblies that produce heat through controlled burning, typically involving burners, control devices, supply lines and related safety components. Commissioning means putting the system into service after installation and verifying that it operates correctly; repair means corrective work after a fault or failure; maintenance means the periodic activities that help preserve performance and continuity of operation. The standard is centred on the general rules for the services themselves, not on detailed design requirements for a specific appliance type.

The common framework provided by the standard

• It addresses the overall organisation of authorised service activities.
• It treats commissioning, repair and maintenance of gas combustion systems together.
• It should be read as a service standard, not as a product or equipment design standard.
• This TS 12355 record is withdrawn, so it serves as a historical reference.

From a general technical perspective, correct installation and setup are fundamental to safe and efficient gas-fired operation. For that reason, commissioning and maintenance are broader than simple fault fixing; they also involve checking, adjustment and continuity of service. TS 12355 should therefore be understood as a framework for the authorised services working in this field.