joule Cyclone series, Installation & Maintenance Manual

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8
Water Supply
The performance of any unvented system is only as good as the mains water supply available. To
this e ect the maximum possible water demand should be assessed, with the knowledge that the
mains supplies both hot and cold services simultaneously. The water heater itself operates at a
pressure of 3bar, controlled by the inlet control set, and is capable of delivering over 50 litres per minute.
The high quality inlet control set has been designed to make the most of the low rates available.
The water supply should be checked to ensure it can meet these requirements. If necessary, consult
the local water authority regarding the likely pressure and flow rate availability.
Consideration should be given to upgrading existing 1⁄2” (15mm) cold mains pipework to a larger
size if the recommended minimum pressure / flow rate is not being achieved. JOULE recommend
that primary pipework used has a minimum diameter of 22mm to ensure low pressure loss.
A high static (no flow) mains pressure is no guarantee of good flow availability. In a
domestic installation 1.5bar and 25ltr/min should be regarded as the minimum. The
maximum mains pressure that the inlet control set can cope with is 10bar.
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 war-
ranty. 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. We recommend not to
use water softener, however if it is used the water is required to be kept at potable standards. This
water heater should only be connected to a water supply which complies with these guidelines for
the JOULE warranty to apply.
Introduction