unvented hot water cylinders
installation and maintenance instructions
Page 3 / 17
discharge may also stop.
CALL OUT A COMPETENT PLUMBER TO SERVICE THE UNIT.
Tell them you have a fault on an unvented cylinder. We stock all the spare parts they may need and Joule can be contacted via
telephone numbers on back page.
Ensure installer has complied and completed the Benchmark checklist on page 15 – 16 of this installation manual.
CHANGE OF WATER SUPPLY
The changing or alternating from one water supply to another can have a detrimental effect on the operation and / or life
expectation of the water heater storage cylinder, pressure temperature relief valve and heating unit. Where there is a
changeover from one water supply to another, e.g. a rainwater tank supply, bore water supply, desalinated water supply, public
reticulated water supply or water brought in from another supply, then water chemistry information should be sought from the
supplier or it should be tested to ensure the water supply meets the requirements given in these guidelines for the Joule
warranty to apply. Water Chemistry This water heater must be installed in accordance with this advice to be covered by the
Joule warranty. This water heater is manufactured to suit the water conditions of most public reticulated water supplies.
However, there are some known water chemistries which can have detrimental effects on the water heater and its operation
and / or life expectancy. If you are unsure of your water chemistry, you may be able to obtain information from your local water
supply authority. This water heater should only be connected to a water supply which complies with these guidelines for the
Joule warranty to apply.
TOTAL DISSOLVED SOLIDS (TDS)
Some water analysis reports may state the conductivity of the water rather than the level of total dissolved solids. Conductivity,
measured in microsiemens per centimetre (µS / cm), is directly proportional to the TDS content of the water. TDS, in mg/L, is
approximately 70% of the conductivity in µS / cm. The Joule warranty will not cover resultant faults to the storage cylinder if this
water heater is connected at anytime to a water supply where the TDS content of the water exceeds 600 mg/L. 16 In locations
where TDS approaches 600 mg/L, e.g. due to sediment, we strongly recommend fitting an appropriate filter to ensure water
entering or in the water heater does not exceed this level at any time i.e. due to sediment build up.
WATER CHEMISTRY LEVELS AFFECTING WARRANTY
The Joule warranty of this water heater will not cover resultant faults on components including the storage cylinder where
water stored in the storage cylinder exceeds at any time any of the following levels:
Total dissolved solids 600 mg/Litre
Total hardness 250 mg/Litre
Chloride 300 mg/Litre
Magnesium 10 mg/Litre
pH 9.5 and not less than 6.5
Calcium 20 mg/Litre
Sodium 150 mg/Litre
Iron 1 mg/Litre
SCALING WATER
Scaling water is water that contains levels of calcium carbonate (total hardness in excess of 250 mg/Litre at any time when the
water heater is operating). Scaling water can block and prevent the pressure & temperature relief valve from operating
resulting in damage to the water heater storage cylinder and water heater components. An expansion control valve is
mandatory in SA & WA and must be fitted in ALL areas with scaling water to assist in preventing blockage of the pressure and
temperature relief valve. Danger: Failure to install an expansion control valve where scaling water conditions occur may result
in the water heater storage cylinder failing, or under certain circumstances, exploding. To avoid damage to the storage cylinder
and water heater components, Joule strongly recommend scaling water be treated before entering the water heater by fitting
appropriate water filters/conditioners etc. Refer to your Local Water Authority for information on water in your area. A build up
of white sediment on hot water taps or shower roses can be indicative of scaling water. Contact Joule if this condition is
observed.
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