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4.7 Step 5: Locate the units Correct location of both outdoor and indoor units is essential for optimum performance, as many of the problems that are experienced with heat pumps are due to poor location of units. 4.7.1 Outdoor units Locate outdoor units: • to allow unimpeded air flow around the unit • in a position that gets full sun in winter • in accordance with the manufacturer’s recommendations for distances to obstructions. If the manufacturer’s recommendations are not given, provide the following minimum distances from obstructions: – 500 mm between air inlet and outlet faces – 600 mm above the unit – 150 mm to other faces (Figure 4.6). Locate the units: • to minimise refrigerant pipe run lengths and bends • to give minimum pipe runs in accordance with the unit manufacturer’s instructions • where condensate can easily be drained away • to allow access for service (minimum 600 mm) (Figure 4.7) • where any blockage (such as from leaves or snow) is quickly seen. Locate the units: • to be protected from the sea spray in coastal areas, sheltered from frost and strong wind (strong wind can cause the condenser fan to spin in reverse and burn out the motor, which is a particular problem when a unit is located on a roof) • where condensation can be appropriately drained away (see 6.1.8 Condensate drainage pipe) condensation will always be produced during heating and must be able to be drained safely • for inverter systems, at least 6.0 m from television aerials to avoid signal interference • in a well ventilated area, and at a safe distance from any gas sources or appliances. e.g. 1.5 m from a LPG bottle. 0.5 m from an instantaneous Gas water heater. Figure 4.6 Outdoor unit clearances 150 mm 500 mm 600 mm 150 mm 600 mm service access Figure 4.7 Service access Figure 4.8 Exchange cylinders, adequately ventilated, in storage or in use. 500 mm 1500 mm = Zone 2 microclimate that will reduce the ambient temperature around the unit • below a window where the unit has a vertical discharge • so that multiple units are competing against each other for air • where the air outlet is directed to where people pass, such as across an accessway • in a garage or enclosed space such as a roof space. Do not locate the unit: • where noise can cause a disturbance to home occupants or to adjacent properties (see Section 4.7.1.1 for more information) • under the house or a deck, or any location that may impede airflow or create a Within space 0.5 m above and 0.5 m laterally from any cylinder valve, extending 1.5 m laterally at the base of the cylinder. 23 500 mmPDF Image | Heat pump installation Good Practice Guide
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