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Read through the material below, then test your understanding.
Module Lessons
Central Heating
Introduction to Central Heating & Part L
Heat Emitters: Radiators and Convectors
Radiator Valves: TRVs and Lockshields
System Layouts: One-Pipe and Two-Pipe
System Layouts: Microbore and Manifold
Boiler Types: Regular, System, and Combination
Condensing Boiler Principles
Open Vented Central Heating Systems
Sealed Central Heating Systems
Expansion Vessels and Pressure Relief
Central Heating Pumps and Circulators
System Controls: Programmers and Thermostats
Motorised Valves: 2-Port and 3-Port
Fully Pumped Systems: The Y-Plan
Fully Pumped Systems: The S-Plan
Filling, Venting, and System Balancing
Water Treatment and System Protection
Lesson Overview
A central heating circulator drives heated water from the boiler through the pipework to the heat emitters. Understanding pump operation, correct positioning relative to the cold feed and vent, and safe replacement procedures ensures quiet, efficient performance.
Learning Objectives
Explain the operating principles, speed settings, and water velocity limits of domestic central heating circulators.
Identify the correct position of the circulator relative to the cold feed, open vent, and neutral point to prevent system aeration.
Describe the step-by-step procedure for safely isolating, removing, replacing, and venting a central heating pump.
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