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6.0 Installing pipework Good pipework gives a safe, efficient and reliable installation that will help the heat pump system perform properly. Too many joints, bends and long lengths can reduce efficiency as it requires more energy for the compressor to pump the refrigerant around the system. Many system failures occur due to poor workmanship of pipework installation. To reduce the likelihood of problems: • pipes must be clean and moisture-free • use pipe sizes recommended by the manufacturer • design pipelines for the shortest runs and minimum number of bends to limit internal friction: – floorconsolesmaynothaveaminimumpiperunandcanbeinstalledbacktoback – high wall units have a minimum pipe run, typically 2.5-3.0 m – check the manufacturer’s instructions for specific run lengths • insulate and protect all pipework • slope pipes towards the compressor to allow any oil that gets into the pipes to drain back to the compressor sump – some compressor oil will get into the pipeline in any system, and if it remains there it will de-rate the system’s pressure and hence its efficiency • install pipelines to allow for seismic, wind and thermal movement • pipes must be rated for the refrigerant pressure being used in the system. 6.1 Pipework installation Good-quality pipework involves the following steps: 1. Selecting suitable pipework and jointing (see Sections 6.1.1 and 6.1.2). 2. Ensuring pipework is clean (see Section 6.1.3). 3. Making bends properly (see Section 6.1.4). 4. Creating flared joints properly (see Section 6.1.5). 5. Ensuring pipework is well-supported (see Section 6.1.6). 6. Insulating refrigerant pipework (see Section 6.1.7). 7. Positioning and connecting the condensate drainage pipe properly (see Section 6.1.8). 6.1.1 Types of pipework Figure 6.1 Twin-insulated and dehydrated pipe Copper pipework forms the closed-coil system through which refrigerant flows. Copper may be hard-drawn or soft-drawn – while hard-drawn is recommended as best practice for pipe diameters of 20 mm and more, soft-drawn is commonly used because it is easier to work with. Use twin-insulated and dehydrated pipe, which is easier to install in trunking and ceiling spaces (Figure 6.1). 27PDF Image | Heat pump installation Good Practice Guide
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