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INSTALLATION
TANK WATER SUPPLY
If the water heater is supplied with water from a tank supply and a pressure pump
system is not installed, then the bottom of the supply tank must be at least 1 m
above the highest point of the hot water plumbing system, including the water
heater. Care must be taken to avoid air locks. The cold water line to the water
heater should be adequately sized and fitted with a full flow gate valve or ball
valve.
HOT WATER DELIVERY
This water heater can deliver hot water at temperatures up to 70°C depending
upon the thermostat setting, sufficiently hot to cause severe scalding. Water at
this temperature may be plumbed to fixtures where water hotter than 55°C is
allowed, such as the kitchen and laundry.
The installing plumber may have a legal obligation to ensure the installation of
this water heater meets the water temperature delivery requirements of Clause
G12 of the New Zealand Building Code so that heated water delivered to sanitary
fixtures and appliances used primarily for personal hygiene is at a temperature
which is unlikely to scald.
It is necessary and we recommend that a temperature limiting device be fitted
between a Rheem 312025 model water heater and the fixtures and appliances
used primarily for personal hygiene such as in a bathroom, ensuite, public
amenities or other ablution areas, to reduce the risk of scalding.
Where a temperature limiting device is installed adjacent to the water heater, the
cold water line to the temperature limiting device can be branched off the cold
water line either before or after the isolation valve and pressure limiting valve,
but must branch off before the non-return valve to the water heater. The
expansion control valve must always be installed after the non-return valve and
be the last valve prior to the water heater.
Two Temperature Zones Using a Temperature Limiting Device
26
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