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General installation information
Pipe sizing
Refer 'Connections and Fittings' for appliance gas consumption. If the gas pipe sizing is
insufficient the customer will not get the full performance benefit. Gas pipe sizing must
consider the gas input to this appliance as well as all the other gas appliances in the
premises. The gas meter and regulator must be specified for this gas rate. An approved
sizing chart such as the one in NZS 5261 should be used.
Water pipe sizing and layout should be performed in accordance with AS/NZS3500. All hot
water pipe work should be insulated to optimise performance and energy efficiency.
Water delivery temperature
Local regulations and/or requirements of AS/NZS3500.4 must be considered regarding
the temperature limitations of hot water supplied to areas used primarily for personal
hygiene. The temperature of these areas may be limited to 55 °C or less.
If the appliance is to deliver water primarily for the purposes of personal hygiene in an
early childhood centre, school, nursing home or similar facility as defined in AS/NZ3500.4 a
Temperature Limiting Device (TLD), such as a Tempering Valve may be required (even if the
appliance is set to 55 °C or less). For these types of applications contact Rinnai.
Requirements for Rinnai Continuous Flow Units Installed Without Controllers
55 °C
Diagram 1 - 55 °C Appliance
When the continuous flow unit is set to deliver water at a temperature higher than 55 °C, it will
be necessary to fit a Temperature Limiting Device for delivery to areas used for the purposes of
personal hygiene. Refer Department of Building and Housing G12.
Water supply
Refer 'Connections and Fittings' for applicable water pressures. Approved pressure
limiting valves may be required if the stated maximum rated water supply pressures
are exceeded. To achieve the rated flow, the stated minimum water supply
pressures must be supplied. The water heaters will operate at lower pressures but
will not achieve the rated flow.
Water chemistry and impurity limits are stated in our detailed warranty statement. Most
metropolitan water supplies fall within these requirements. If you are unsure about the quality
of the water, please contact Rinnai and we will provide you with the details of an authorised
agency who are able to test your water for compliance to Rinnai standards. If sludge or foreign
matter is present in the water supply, a suitable filter or strainer should be incorporated in the
water supply to the water heater.
Rinnai New Zealand Ltd.
> 55 °C
> 55 °C
< 55 °C
Diagram 2 - Not a 55 °C Appliance
(TLD = Temperature Limiting Device)
Continuous Flow Water Heater Installation Manual:
7
< 55 °C
03-11
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