CSA Group's 2025 Gas Trade materials reference the Red Seal Occupational Standard (RSOS) for your preparation to become a nationally recognized gasfitter. Please visit the Red Seal Program's website for more details.
Overview
Controls are mechanical, electro-mechanical, or electrical components that determine when and how a controlled device will operate or stop operating. A control, in its simplest form, is a mechanical device that is manually operated (e.g., a manual shut-off valve).
Simple automatic controls can also be mechanical (e.g., a pressure relief valve) or electro-mechanical (e.g., a bi-metal thermostat).
Electrical controls determine when and how power will be delivered to an electrical load. An electrical control, at its most basic, applies or removes voltage to a single load. In more complex systems, the activation of one control can influence another control which, in turn, manages a load.
Learning Objectives
At the end of this Unit, you will be able to
- Describe the basic functions of controls;
- Define common control terms;
- List the function and selection criteria for mechanical controls;
- List the function and selection criteria for electrical controls;
- Describe the interaction of mechanical and electrical control devices;
- Describe troubleshooting procedures for control systems;
- State the propane and natural gas code requirements for controls on appliances over 400 000 Btu/h (120 kW); and
- Review a control system application to ensure that manufacturer and code requirements are met.
Revision Summary:
The 8th edition of the Gas trade training includes the following changes.
- Edits to content and assignment questions to improve clarity, readability, and consistency
- Improvements to 80+ images (additions, deletions, edits, replacements, etc.)
- Alignment with major work activities and tasks from the updated (2024) Red Seal Occupational Standard (RSOS); Gasfitter – Class BÂ
- Updates to information relevant to the revised 2022 Workplace Hazardous Materials Information System (WHMIS).
- Updates to content related to the CSA B149 Codes and other referenced codes
