Rheem W2W Series, Owner'S Manual And Installation Instructions

Page: 21 / 72

INSTALLATION
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)
1000 kPa
Expansion control valve setting * 850 kPa
Relief valve setting (SS/RT Series storage tanks) 850kPa
Expansion control valve setting * 700 kPa
Max supply pressure (VE/610 Series storage tanks)
Without expansion control valve 800 kPa
With expansion control valve 680 kPa
Max supply pressure (SS/RT Series storage tanks)
Without expansion control valve 680 kPa
With expansion control valve 550 kPa
* 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.