Know the requirements to inspect, service and maintain heat pump system installations _non-refrigerant circuits_ — City and Guilds of London Institute Vocationally-Related Qualification Construction & Building Services Revision

    This element covers the routine inspection, servicing, and maintenance of non-refrigerant circuit components in heat pump installations, including hydronic

    Topic Synopsis

    This element covers the routine inspection, servicing, and maintenance of non-refrigerant circuit components in heat pump installations, including hydronic distribution systems, circulator pumps, strainers, expansion vessels, and control interfaces. It ensures learners can perform scheduled maintenance tasks, diagnose common faults such as flow irregularities or sensor failures, and rectify issues safely to maintain system efficiency and compliance with manufacturers’ specifications and industry standards.

    Key Concepts & Core Principles

    Exam Tips & Revision Strategies

    Common Misconceptions & Mistakes to Avoid

    Examiner Marking Points

    Know the requirements to inspect, service and maintain heat pump system installations _non-refrigerant circuits_

    CITY AND GUILDS OF LONDON INSTITUTE
    vocational

    This element covers the routine inspection, servicing, and maintenance of non-refrigerant circuit components in heat pump installations, including hydronic distribution systems, circulator pumps, strainers, expansion vessels, and control interfaces. It ensures learners can perform scheduled maintenance tasks, diagnose common faults such as flow irregularities or sensor failures, and rectify issues safely to maintain system efficiency and compliance with manufacturers’ specifications and industry standards.

    1
    Learning Outcomes
    3
    Assessment Guidance
    3
    Key Skills
    1
    Key Terms
    4
    Assessment Criteria

    Assessment criteria

    City & Guilds Level 3 Award In The Installation and Maintenance of Heat Pumps Systems (Non-refrigerant Circuits) (QCF)

    Topic Overview

    This qualification covers the installation and maintenance of heat pump systems that do not involve refrigerant circuits, focusing on air source and ground source heat pumps. You will learn how to safely install, commission, and maintain these systems, including pipework, controls, and electrical connections. The course emphasizes energy efficiency, environmental impact, and compliance with UK building regulations and standards such as MCS (Microgeneration Certification Scheme).

    Heat pumps are a key technology for reducing carbon emissions in heating, making this qualification highly relevant for the UK's net-zero targets. You will develop practical skills in system design, component selection, fault finding, and performance testing. The course also covers health and safety, risk assessment, and customer communication, preparing you for real-world installation scenarios.

    This award is part of the wider City & Guilds suite for heat pump systems and is often taken alongside other qualifications in plumbing, heating, or electrical installation. It provides a solid foundation for careers in renewable energy, heating engineering, or building services. Mastery of this topic ensures you can deliver efficient, reliable heat pump installations that meet industry standards.

    Key Concepts

    Core ideas you must understand for this topic

    • →Heat pump principles: Understand the refrigeration cycle (without refrigerant handling) and how heat is transferred from the outside air or ground to the heating system.
    • →System components: Identify and explain the function of key parts such as the evaporator, condenser, compressor, expansion valve, and controls (thermostats, flow meters, pumps).
    • →Installation procedures: Follow correct methods for mounting indoor and outdoor units, connecting pipework (flow and return), and integrating with existing heating systems (e.g., radiators, underfloor heating).
    • →Commissioning and testing: Perform checks on water flow rates, pressure, temperature differentials, and electrical safety (e.g., earth bonding, RCD testing).
    • →Maintenance and fault finding: Carry out routine servicing (cleaning filters, checking refrigerant charge via gauges – though not handling refrigerant), and diagnose common issues like low flow, air locks, or control failures.

    Learning Objectives

    What you need to know and understand

    • Know the requirements for the non-refrigerant circuit routine service and maintenance of heat pump system installations, Know how to diagnose faults in heat pump system installations, Know how to rectify non-refrigerant circuit faults in heat pump system installations

    Assessment Criteria

    Key criteria assessors look for in your portfolio

    • Award credit for demonstrating correct isolation procedures (electrical and hydronic) before any service or maintenance task.
    • Award credit for accurately recording service checks, including system pressures, flow rates, and component condition, on a service report or log.
    • Award credit for applying a logical fault-finding sequence that prioritises non-invasive checks (e.g., visual inspection, controller fault codes) before invasive testing.
    • Award credit for correctly identifying and replacing common faulty components in the non-refrigerant circuit, such as pump cartridges or blocked filters, while confirming operation post-repair.

    Assessment Guidance

    Guidance for achieving higher grades

    • 💡Always consult the manufacturer’s installation and maintenance manual specific to the heat pump model, as requirements for non-refrigerant circuits can vary significantly.
    • 💡Use a systematic diagnostic approach: check simple, external components (e.g., fuses, isolators, and user settings) before moving to complex controls or wiring.
    • 💡Document all findings and actions thoroughly; incomplete or inaccurate service records are a common reason for assessment penalties in practical assignments.
    • 💡Always reference current regulations: In exam answers, mention specific standards like BS 7671 (IET Wiring Regulations), Building Regulations Part L (conservation of fuel and power), and MCS 023 (heat pump installation). This shows you understand the legal framework.
    • 💡Show your working: For calculations (e.g., heat loss, flow rate, COP), write down each step clearly. Even if the final answer is wrong, you can gain marks for correct method and formula use.
    • 💡Use diagrams: In written answers, sketch simple system layouts (e.g., showing flow and return pipes, buffer tank, expansion vessel). Label components and explain their function. This demonstrates practical understanding.

    Common Mistakes

    Common errors to avoid in your coursework

    • Overlooking the correct procedure for bleeding air from the system after maintenance, leading to pump cavitation or circulation issues.
    • Confusing symptoms of a faulty circulator pump (e.g., no flow, noisy operation) with those of a blocked filter or closed isolation valve.
    • Failing to verify system filling pressure and expansion vessel charge before diagnosing electrical faults, which can waste time on incorrect diagnostics.
    • Misconception: Heat pumps work like boilers and produce high-temperature water instantly. Correction: Heat pumps operate at lower flow temperatures (typically 35-45°C) and work best with underfloor heating or oversized radiators. They heat water gradually and maintain steady temperatures.
    • Misconception: You can install a heat pump without considering the property's insulation. Correction: Heat pumps are most efficient in well-insulated homes. Poor insulation leads to high running costs and inadequate heating. Always assess the building's heat loss before installation.
    • Misconception: Ground source heat pumps always require deep boreholes. Correction: Ground source systems can use horizontal loops in trenches (if enough land is available) or vertical boreholes. The choice depends on site conditions and available space.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •Basic understanding of heating systems (e.g., central heating, radiators, hot water cylinders).
    • •Fundamental electrical knowledge (e.g., voltage, current, wiring, safety).
    • •Familiarity with plumbing principles (pipework, fittings, water pressure).

    Key Terminology

    Essential terms to know

    • Know the requirements for the non-refrigerant circuit routine service and maintenance of heat pump system installations, Know how to diagnose faults in heat pump system installations, Know how to rectify non-refrigerant circuit faults in heat pump system installations

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