Technical data

41
TEMPERATURE CONTROL
HOTTER WATER INCREASES THE RISK OF SCALD INJURY.
This water heater can deliver water at temperatures which can cause scalding.
It is necessary and we recommend that a temperature limiting device be fitted between the water heater and
the hot water outlets in any ablution and public areas such as bathrooms, ensuites or public amenities, to
reduce the risk of scalding. The installing plumber may have a legal obligation to ensure the installation of
this water heater meets the delivery water temperature requirements of AS/NZS 3500.4 so that scalding
water temperatures are not delivered to a bathroom, ensuite, or other ablution or public area.
RECIRCULATION SYSTEM
Where the installation involves close temperature control for
any purpose, or the installation is providing water above
80°C, it is essential to install a circulating pump. All valves
and associated equipment must be suitable for safe operation
up to the maximum thermal discharge temperature of the
temperature pressure relief valve, i.e. 99°C.
Where water is required at a sanitising temperature of 82°C
for dishwashing or air conditioning applications, the following
installation is strongly recommended:
1. A recirculation pump must be fitted.
2. The pump must be capable of withstanding working pressures greater than 1000 kPa and be
constructed of materials corrosion resistant to hot water.
3. The pump should be installed with a full flow service valve on each side of it.
4. A non-return valve should be fitted in the recirculation line to prevent back flow of hot or cold water.
5. Length of branch lines off the main recirculation line should be kept to a minimum.
6. The installation of gas, electric and water services must comply with all relevant local Authorities‟
regulations.
7. The cold water supply pressure or the setting of the pressure limiting valve must not exceed the working
pressure of the pump.