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Rinnai Australia - 9 - HOTFLO Electric Storage Water Heater Operating/Installation Manual
WATER QUALITY
The water quality of most public supplies is suitable for the water heater. Water quality from bore wells is generally
unsuitable. Refer to the ‘Warranty Conditions’ for water quality parameters and how they affect warranty. If in doubt
about water quality, have it checked against the parameters listed in the warranty conditions.
In a scaling water supply, calcium carbonate and possibly other compounds are deposited out of the water onto
any hot metallic surface and form a scale.
Scaling water is defined as having a total hardness in excess of 200 mg/litre (expressed as Calcium Carbonate) or
a Saturation Index in excess of +0.4. Scale deposits may form onto the metallic surfaces of the PTR valve and may
prevent it from operating properly. To prevent this, an expansion control valve (ECV) must be fitted on the cold
water line after the non-return valve in areas of scaling water. ECVs’ must be fitted in South Australia and Western
Australia to comply with local regulations.
Refer to the ‘Warranty Conditions’ for water quality parameters and how they affect warranty. If in doubt about
water quality, have it checked against the parameters listed in the warranty conditions. If sludge or foreign matter
is present in the water supply, a suitable strainer or filter should be incorporated in the water supply to the storage
cylinder.
Connection to a low pressure gravity or cylinder water supply
If the water heater is supplied by a low pressure gravity or cylinder water supply, the bottom of the supply cylinder
must be at least one meter above the highest hot water outlet and care must be taken to avoid air locks. Pipe sizing
and valve selection must be performed to allow for the water supply pressure.
HOT WATER STORAGE AND DELIVERY TEMPERATURES
Storage Temperature
AS/NZS 3500.4 conveys that hot water shall be stored at a minimum temperature of 60°C. The thermostat setting
on the storage water heater has been factory pre-set to 65°C to meet this requirement. The thermostat temperature
setting is adjustable to a maximum temperature setting of 75°C but this usually is not required.
Sanitary Fixtures Delivery Temperature
Water temperatures over 50°C can cause severe scalds. Children, disabled and the elderly are at the highest risk
or being scalded.
Local regulations and/or the requirements of AS/NZS 3500.4 must be considered regarding the temperature
limitations of hot water supplied to areas used primarily for personal hygiene. The temperature of is limited to 45°C
for early childhood centres primary and secondary schools and nursing homes or similar facilities for young, aged,
sick or people with disabilities and 50°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 'new' installations.
Installers should explain to customers the merits of limiting the temperature of water supplied to areas used
primarily for personal hygiene for installations which are not classified as 'new'.
Figures 3 and 5 show the installation examples with Temperature Limiting Devices (TLD's).
Water Pipes
All hot water pipe work should be insulated with Polythene foam or equivalent insulation to optimize performance
and energy efficiency. Such insulation may also be mandatory under local regulations. Insulation must be
weatherproof and UV resistant if exposed.
Water pipe sizing should be performed in accordance with AS/NZS 3500.4.
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 12mm are used. If drilling is required take extreme care not to
penetrate the inner cylinder. Damage to the inner cylinder is not covered under warranty.
• The thermostat settings must only be adjusted by an Electrician or other suitably qualified
trades person.
• The access cover to the element and thermostat must only be removed by an Electrician or
other suitably qualified trades person.
• DANGER: The operation of the thermal cut-out indicates a possibly dangerous situation.
DO NOT reset the thermal cut-out until the water heater has been serviced by a qualified
person.
WARNING
GENERAL INSTALLATION
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