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| Demand Rapid owner & installer guide 12949-B 02-19
General installation information
Cold water inlet
32 mm fitting on the left hand side of the cylinder, approximately 285 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 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.
The Demand Rapid will deliver 75 °C water to the
plumbing system. Ensure the system components are
designed to operate continuously at this temperature.
For installations where the hot water supply temperature
must be lower, one of the following plumbing
modifications are required.
1. Install a tempering valve between the inlet and outlet
of the storage water heater to reduce the temperature.
2. Re-plumb the INFINITY gas water heater to the hot
water return connection as shown. This will
reduce the hot water temperature being delivered to
approximately 70 °C.
Pressure limiting valve
500 kPa maximum
Cold water expansion valve
700 kPa maximum
Cylinder thermostat setting
To meet the New Zealand Building code requirement
1
to disinfect water for legionella bacteria
2
, 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
WARNING
Delivery temperatures
Sanitary fixture delivery temperatures
Water temperatures over 55 °C can cause severe scalds. Local regulations must be considered
regarding temperature limitations of hot water supplied to areas used primarily for personal
hygiene. The temperature is limited to 45 °C for early childhood centres, schools, nursing
homes or similar facilities, and 55 °C for all other buildings. To comply with these requirements a
temperature limiting device, such as a tempering or thermostatic mixing valve will be required on
all installations.
