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GENERAL INSTALLATION
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 P&TR 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 tank water supply
If the water heater is supplied by a low pressure gravity or tank water supply, the bottom of the supply
tank 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 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.
•
The thermostat settings must only be adjusted by an Electrician or other
suitably qualified trades person.
WARNING
•
The access cover to the element and thermostat must only be removed by an
Electrician or other suitably qualified trades person.
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.
Rinnai Australia
- 12 -
HOTFLO Electric Storage Tanks Operating/Installation Manual
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