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Do not: • use flexible drainage piping in internal wall spaces • use flexible ribbed drainage piping for lateral pipe runs, as water may sit in the ribs or low points may occur in the pipe • use electrical conduit. Internal units should be located to avoid the need to install a condensate pump. Where unavoidable, install in accordance with the manufacturer’s specification. Advise the owner of the maintenance requirements of the pump and that it may make noise. 6.1.8.2 From the outdoor unit Discharge condensate: • onto a grassed or planted area • into a stormwater gulley trap • through timber decking to ground below. Do not discharge where it can run over a footpath as it may become slippery or freeze in the winter. 6.2 Pipework pre-installation in new buildings When installing pipework in a new building, it is easiest to do it before wall linings and claddings are put on. Procedure • Unroll and lay out pipe and connection cable to connect indoor and outdoor units. • Tape pipe and connection cable together with vinyl tape at 1-1.5 m spacings. • Establish the location and centre of the indoor unit. • Establish the location of the outdoor unit. • Run taped pipe/cable across the top of the bottom truss chord/ceiling joist between the unit locations (Figure 6.17). • Fix with galvanised mild steel pipe brackets. Figure 6.17 Run pipe/cable across truss chord/ceiling joist Indoor unit location • Notch the top plate and studs (90 x 45 mm) to a maximum depth of 25 mm to insert pipe/cable (Figures 6.18 and 6.19). Figure 6.18 Notch the top plate and studs (A) Figure 6.19 Notch the top plate and studs (B) • Insert pipe/cable into notch and fix galvanised mild steel strap over to hold securely in position (Figure 6.20). Notching and drilling must not exceed the limits given in NZS 3604 – see Figure 4.12. 32PDF Image | Heat pump installation Good Practice Guide
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