Rinnai HJ COOPER LC Series Owner And Installer Manual page 11

Plumbing setup for a low pressure copper cylinder with a wetback
Hot water to kitchen and laundry
Tempered hot water to bathroom
Isolation and non-return valve
The hot flow pipe from the wetback shall have a minimum slope of 1:20 at any point, and
an average slope of not less than 1:7.
Base requirements
Tanks should be installed on a flat level base of sufficient strength to support the weight of the
water heater when full.
The water heater must also be suitably restrained against seismic activity, 'G12/AS1 Figure 14'
details an acceptable method of restraint.
Drip tray/catch pan (MUST be fitted)
The Rinnai warranty does not cover any consequential loss from leaks to the cylinder, so it's important
a suitably drained drip tray/catch pan is fitted as per AS/NZS 3500.4:2015 5.4 and G12/AS1 6.11.3
Pipe work
It is the installer's responsibility to adequately size the distribution pipe work in a property to
ensure sufficient performance from all outlet fittings. Water pipe sizing should be performed
in accordance with AS/NZS 3500.4 and/or G12 AS1. Pipe sizing and valve selection must be
performed to allow for the water supply pressure.
A drain off tap or line must be fitted to the inlet of the water heater.
All hot water pipe work should be insulated with polythene foam or equivalent insulation to
optimise performance and energy efficiency.
To prevent damage to the water heater when attaching pipe clips or saddles to the jacket, it is
recommended that self drilling screws with a maximum length of 12 mm are used. If drilling is
required take extreme care not to penetrate the inner cylinder.
Tempering
Pressure reducing valve
Isolation
Line strainer
valve
Drip tray
Return pipe
Vent pipe terminating
outside building
The vent pipe of low pressure water
heaters shall have an internal diameter
of at least 20 mm.
valve
Riser tube
Hot flow pipe
Low pressure indoor copper cylinders: Owner and installer guide: 20733-D 04-18 | 11