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7.3.3 Installing an outdoor unit on a timber deck Figure 7.16 Fixing unit to a timber deck • Fix hot-dip galvanised mounting rails into the joists with 75 mm long stainless steel screws. Alternatively, fix the mounting rails to 140 x 45 H3.2 treated timber rails laid on flat that are screw- fixed to the decking joists with 115 mm long stainless steel screws (Figure 7.16). Provide anti-vibration mounts or pads. Fix hot-dip galvanised mounting rails through the rails and joists with 75 mm long stainless steel screws. • Check that rails are level before tightening – pack with plastic shims as necessary to level (Figure 7.17). • Fix the unit to the rails and tighten fixing bolts. anti-vibration mounts 190 × 45 H3.2 treated timber rails screw- fixed to joists fix at centres to suit unit timber decking joists Figure 7.17 Pack with plastic shims to level 7.3.4 Installing an outdoor unit on a foundation or wall (concrete/concrete masonry only) Figure 7.18 Wall-mounted unit on brackets – masonry wall • Check the structural integrity of the wall or foundation. • Bolt fix hot-dip, galvanised brackets or proprietary brackets to the wall or foundation using stainless steel masonry anchors or screw bolts (Figure 7.18). • Check that the brackets are level before tightening. • Waterproof around fixings according to the material. • Fix the unit to the brackets. • Anti-vibration pads may be used. • Ensure the ground underneath is stable, compact and level. bracket spacing to suit unit footings galvanised mild steel brackets bolt-fixed to wall with stainless steel masonry anchors maintain minimum distance between unit and wall (manufacturer’s recommendation or 150 mm min.) Note: Outdoor units may be able to be wall-mounted to some lightweight claddings but the connections and weatherproofing details must be specifically designed to maintain the integrity of the weatherproofing. 39PDF Image | Heat pump installation Good Practice Guide
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