Rheem W2W Series Owner's Manual And Installation Instructions page 21

MAINS WATER SUPPLY
Where the mains water supply pressure exceeds that shown in the table below,
an approved pressure limiting valve is required and should be fitted as shown in
the installation diagram (refer to diagram on page 38).
Relief valve setting (VE/610 Series storage tanks)
Expansion control valve setting *
Relief valve setting (SS/RT Series storage tanks)
Expansion control valve setting *
Max supply pressure (VE/610 Series storage tanks)
Without expansion control valve
With expansion control valve
Max supply pressure (SS/RT Series storage tanks)
Without expansion control valve
With expansion control valve
* Expansion control valve not supplied with the water heater.
TANK WATER SUPPLY
If the storage tank 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 storage
tank. Care must be taken to avoid air locks. The cold water line to the storage
tank should be adequately sized and fitted with a full flow gate valve or ball valve.
HOT WATER DELIVERY
This water heater can deliver water at temperatures which can cause scalding.
It is necessary and we recommend that a temperature limiting device be fitted
between the storage tanks and the hot water outlets in any ablution area such
as a bathroom or ensuite, to reduce the risk of scalding. The installing plumber
may have a legal obligation to ensure the installation of this water heater system
meets the delivery water temperature requirements of AS/NZS 3500.4 so that
scalding water temperatures are not delivered to a bathroom, ensuite or other
ablution area.
Where a temperature limiting device is installed adjacent to the storage tanks,
the cold water line to the temperature limiting device can be branched off the
cold water line either before or after the isolation valve, pressure limiting valve
and non return valve to the water heater system. If an expansion control valve is
required, it must always be installed after the non return valve and be the last
valve prior to the storage tanks.
INSTALLATION
21
1000 kPa
850 kPa
850kPa
700 kPa
800 kPa
680 kPa
680 kPa
550 kPa