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7.3 Installing the outdoor unit Figure 7.14 Unobstructed gap under outdoor unit fixed on concrete pad cast in place Install the outdoor unit so that: • it sits level • it cannot fall over • the weight is fully supported • it has an unobstructed gap under it (Figure 7.14) • it creates no vibration • there is a suitable clearance (about 100mm) underneath to allow for hosing and clearing of leaves and dirt • fixings used are corrosion-resistant – typically requires stainless steel. The outdoor unit can be fixed on: • a concrete pad cast in place or a single piece pre-cast slab at least 40 mm thick (see Section 7.3.1) • a concrete patio or balcony (see Section 7.3.2) • a timber slatted deck with anti-vibration mounts (see Section 7.3.3) • brackets fixed to a foundation or wall (see Section 7.3.4) • the roof where the installation has been specifically designed (engineered) to accommodate live loads and wind forces acting on the roof, and it incorporates anti-vibration mounts (see Section 7.3.5). • a specified base in accordance with manufacturers instructions Proprietary mounting systems for roofs and walls are available and should be installed in accordance with the supplier’s instructions. Do not fix the unit onto a waterproof deck or a membrane roofing system as the fixings will penetrate and compromise the waterproofing. 7.3.1 Installing an outdoor unit on a concrete pad Figure 7.15 Concrete pad construction • Construct the pad as shown in Figure 7.15 (check construction if done by others) or place and level a single unit 950 x 450 x 50 mm thick pre-cast concrete slab. • Fix proprietary mounting rails, where supplied, or hot-dip, galvanised mounting rails at centres to suit the unit. • Securely fix the mounting rails to the concrete with 316 stainless steel masonry anchors or screw bolts using two fixings per rail. • Check that rails are level before tightening – pack with plastic shims as necessary to level. • Fix the unit to the rails and tighten fixing bolts/anchors. proprietary footings to provide clearance under unit 50 mm fix at centres to suit unit concrete pad 50 mm 50 mm 70 mm min. (100 mm) better 38 50 mm 7.3.2 Installing an outdoor unit on a concrete balcony or patio • Fix proprietary mounting rails (where supplied) or hot-dip galvanised mounting rails over anti-vibration mounts, at centres to suit the unit. • Securely fix the mounting rails to the concrete with 316 stainless steel masonry anchors or screw bolts with two fixings per rail. • Check that rails are level before tightening – pack with plastic shims as necessary to level. • Fix the unit to the rails and tighten fixing bolts. Note: Units must not be fixed to waterproof concrete or timber framed decks.PDF Image | Heat pump installation Good Practice Guide
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