Install, commission and handover heat pumps _non-refrigerant circuits_
This subtopic equips learners with the practical skills and knowledge to safely and competently install, commission, and hand over air and ground source heat pump systems, focusing exclusively on non-refrigerant circuits. It covers planning and preparation, the physical installation of heat pump units, system testing and commissioning, and final customer handover procedures, ensuring compliance with industry standards and manufacturer instructions.
Assessment criteria
Topic Overview
The City & Guilds Level 3 Award in the Installation and Maintenance of Heat Pump Systems (Non-refrigerant Circuits) is a specialised qualification for experienced heating and plumbing professionals. It focuses on the non-refrigerant aspects of heat pump systems, including the design, installation, commissioning, and maintenance of the water and air sides of the system. This award is essential for those looking to expand their skills into renewable heating technologies, as heat pumps are a key component of the UK's net-zero strategy.
The course covers heat pump types (air source, ground source, and water source), system components, pipework, controls, and the principles of heat transfer. It also addresses regulatory requirements, building regulations, and standards such as MCS (Microgeneration Certification Scheme) and Part L of the Building Regulations. By mastering these topics, students can confidently install and maintain heat pump systems that are efficient, safe, and compliant with current legislation.
This qualification sits within the broader context of low-carbon heating and the transition away from fossil fuels. As the UK government phases out gas boilers in new homes, heat pump installation skills are in high demand. This award provides a solid foundation for further study, such as the full Level 3 Heat Pump qualification that includes refrigerant handling, or progression into other renewable technologies like solar thermal.
Key Concepts
Core ideas you must understand for this topic
- →Heat pump types and their applications: air source (ASHP), ground source (GSHP), and water source (WSHP). Understand the efficiency differences (COP and SCOP) and typical installation scenarios.
- →System components: evaporator, condenser, compressor, expansion valve (refrigerant circuit), plus non-refrigerant parts like buffer tanks, expansion vessels, circulating pumps, and controls.
- →Heat distribution systems: underfloor heating, radiators, and fan coil units. Know how to size and design systems for low-temperature operation (typically 35-45°C flow temperature).
- →Commissioning and testing: flow rates, pressure drops, temperature differentials, and system balancing. Understand the importance of correct flow rates for heat pump efficiency.
- →Regulatory compliance: MCS standards, Part L of Building Regulations (conservation of fuel and power), and the Renewable Heat Incentive (RHI) requirements for domestic installations.
Learning Objectives
What you need to know and understand
- Plan and prepare for the installation of heat pumps (non-refrigerant circuits), Install air and ground source heat pump units (non-refrigerant circuits), Test and commission a ground source heat pump installation (non-refrigerant circuits), Test and commission an air source heat pump installation (non-refrigerant circuits), Handover an air or ground source heat pump installation
Assessment Criteria
Key criteria assessors look for in your portfolio
- Award credit for demonstrating correct interpretation of manufacturer’s installation instructions and site-specific plans during preparation.
- Expect evidence of proper positioning, secure fixing, and adequate provision for service access of heat pump units.
- Credit for correct selection and connection of hydraulic components (pipes, valves, strainers, expansion vessels) with reference to system design.
- Look for verification that electrical supplies are isolated, correctly rated, and safely connected in line with IET Wiring Regulations.
- Award marks for thorough flushing and filling of the heat transfer fluid circuit, including appropriate antifreeze concentration and system pressure.
- Credit for systematic commissioning checks, including flow rate adjustment, pump operation, controller programming, and absence of leaks.
- Expect clear evidence of user instruction covering system operation, energy efficiency settings, and basic fault recognition.
- Mark for completion of all required handover documentation, including commissioning records, user manuals, and notification to relevant bodies.
Assessment Guidance
Guidance for achieving higher grades
- 💡Always refer to the manufacturer’s specific installation and commissioning literature; answers should reflect compliance with these documents.
- 💡Use a systematic, step-by-step approach when describing commissioning tasks—this mirrors how an assessor would observe your practical work.
- 💡Emphasise safety procedures, particularly electrical isolation and handling of antifreeze, as these are key assessment criteria.
- 💡In the handover section, mention the importance of demonstrating the controls to the customer and confirming their understanding through questioning.
- 💡Remember that high-quality photographic evidence and detailed annotations in your portfolio can significantly strengthen your assessment submission.
- 💡Always reference current regulations: In exam answers, mention specific parts of Building Regulations (e.g., Part L, Part F) and MCS standards. This shows you understand the legal framework and can apply it to installations.
- 💡Use correct terminology: Distinguish between 'heat pump unit' and 'heat pump system'. The system includes all ancillary components (buffer tank, expansion vessel, etc.). Examiners look for precise language.
- 💡Show calculations: For commissioning questions, demonstrate how to calculate flow rate using the formula: Flow rate (l/s) = Heat output (kW) / (4.18 × ΔT). Show each step and include units. This secures method marks even if the final answer is slightly off.
Common Mistakes
Common errors to avoid in your coursework
- Failing to isolate the electrical supply before making connections, posing a safety risk.
- Overlooking the need to adequately purge air from the heat transfer fluid circuit, leading to reduced performance and noise.
- Incorrectly sizing or selecting expansion vessels, causing frequent pressure losses or system shutdowns.
- Neglecting to check and adjust flow rates to match design specifications during commissioning.
- Omitting to complete the Benchmark commissioning checklist or equivalent handover records, which is a regulatory requirement.
- Misconception: Heat pumps work like boilers and can simply replace them. Correction: Heat pumps operate at lower flow temperatures and require larger heat emitters (e.g., oversized radiators or underfloor heating) to deliver the same heat output. A direct swap without system redesign leads to poor performance.
- Misconception: Ground source heat pumps always have higher efficiency than air source. Correction: While GSHP typically has higher COP, the installation cost is significantly higher due to ground loop drilling. Modern ASHPs can achieve SCOP >3.5 in well-designed systems, making them cost-effective in many UK homes.
- Misconception: The heat pump's COP is constant. Correction: COP varies with outdoor temperature and system design. For example, an ASHP's COP drops in cold weather. Proper sizing and controls (e.g., weather compensation) are crucial to maintain efficiency year-round.
Frequently Asked Questions
Common questions students ask about this topic
Pass / Merit / Distinction Evidence Checklist
How your portfolio evidence is graded for CITY AND GUILDS OF LONDON INSTITUTE Install, commission and handover heat pumps _non-refrigerant circuits_
Every vocational unit is marked against named criteria rather than an exam percentage. Your tutor's brief lists the exact codes for this unit — here is what each band is asking you to do.
Demonstrate baseline knowledge, accurate terminology, and core practical application.
Provide detailed analysis, structured explanations, and clear workplace reasoning.
Deliver thorough evaluation, original problem solving, and fully justified recommendations.
Before You Start
Prior knowledge that will help with this topic
- •Level 2 or equivalent qualification in plumbing or heating engineering, covering basic pipework, soldering, and system design.
- •Understanding of central heating systems: components, controls, and basic hydronic principles (flow, pressure, temperature).
- •Familiarity with UK building regulations and safe working practices (e.g., Gas Safe or equivalent registration is beneficial but not mandatory).
Coursework AI Review
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Key Terminology
Essential terms to know
- Plan and prepare for the installation of heat pumps (non-refrigerant circuits), Install air and ground source heat pump units (non-refrigerant circuits), Test and commission a ground source heat pump installation (non-refrigerant circuits), Test and commission an air source heat pump installation (non-refrigerant circuits), Handover an air or ground source heat pump installation
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