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7.3.5 Installing an outdoor unit onto the roof • Roof installations must be specifically designed. • Screw fix hot-dip, galvanised brackets or a proprietary mounting system into the roof framing to support painted timber base clear of roofing. If mounting on timber base, use painted H3.2 treated timber. • Provide anti-vibration mounts. • Insert ethylene propylene diene M-class (EPDM) rubber washers between the bracket and the roofing. • Check that the brackets are level before tightening. • Seal all fixings as for the rest of the roof fixing; for example, use EPDM or neoprene. • Fix the unit to the timber. Do not: • mount units on concrete or clay tile roofs (tiles are not strong enough to allow mounting and the weight of the installers working on the roof) • mount directly onto metal roofing, as roofing can act as a sound amplifier and direct fixing may cause corrosion of the roofing • let tanalised timber come into direct contact with galvanized steel roofing as it is not compatible. 7.4 Connecting piping to indoor and outdoor units Connection of piping to indoor and outdoor units must be done in the following order: 1. Connect the piping to the indoor unit (see Section 7.4.1). 2. Fix trunking (see Section 7.4.2). 3. Connect the piping to the outdoor unit (see Section 7.4.3). 7.4.1 Connect the piping to the indoor unit Figure 7.19 Bind insulation with vinyl tape • Use twin-insulated and dehydrated copper piping. • Cut and flare the copper pipes for connection to the indoor unit (see 6.1.5 Creating flared joints). • Apply oil to both the flare and the indoor unit, ensuring that the oil is compatible with the refrigerant. • Align and connect the pipes and tighten the flare nut by hand. • Tighten the flare nut connections using two spanners to the correct torque. • Overlap the connection pipe and indoor pipe insulation. • Bind the insulation with vinyl tape (Figure 7.19). • Connect and tape the drainage hose to the drainage outlet (Figure 7.20). Figure 7.20 Tape drainage hose to drainage outlet 40PDF Image | Heat pump installation Good Practice Guide
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