General Layout Of System - Rinnai Demand Duo Installation Manual

General layout of system

The system layout below, depicting the DD400 system, highlights components
provided by Rinnai and components that are required to be supplied by the installer.
Cold water inlet
32 mm fitting on the left hand side of the cylinder, approximately 280 mm above the ground. For
ease of draining it is advisable to fit a 'tee' piece with a capped valve or drain line between the
cold water isolation valve and cold water inlet connection on the Demand Duo cylinder.
Hot water outlet
32 mm fitting on the left hand side of the cylinder. Ensure adequate insulation/lagging is fitted to
the hot water pipe to minimise heat loss. Pipe sizing must be sized to allow sufficient water flow
to the hot water fixtures.
Pressure limiting valve
500 kPa.
Cylinder thermostat setting
To meet the New Zealand Building code requirement
the cylinder thermostat has been set to 65 °C.
1 Clause G12.3.9, Acceptable Solution G12/AS1 6.14.3
2 Legionella is a bacterium that can cause Legionnaires' disease―a severe form of pneumonia
8 | Demand Duo CFHW with storage backup installation guide: 12583-B
Pipe and fittings
by Rinnai
Pipe and fittings
by installer
Pipe and fittings
by Rinnai
Pipe and fittings
by Rinnai
CM5-2 SS316 pump
1 to disinfect water for legionella bacteria
Alphastat
controller
2 ,