Rheem Guardian Warm Water Owner's Manual And Installation Instructions page 18

CONNECTION SIZES

Cold water connection: DN 40 copper

Hot water connection: DN 40 copper

Warm water flow connection: DN 50 copper

Warm water return connection: DN 25 copper

UV inlet and outlet connections: 2" BSP male
COLD WATER CONNECTION DETAIL
The main cold water supply is fed to the cold water inlet of both the water heating plant and the warm water unit.
Refer to the cold water connection details below. The cold water supply to the warm water unit is branched from
the main cold supply after the main isolating valve, non-return valve and pressure limiting valve (if required).
A DN 50 check valve suitable for use with hot water is supplied with the warm water unit. This is to be fitted
horizontally in the cold water line, after the cold water supply take-off to the warm water unit, and before any
expansion control valve (if fitted). If a HOT water return line is fitted it must enter between the DN 50 check valve
and the cold water inlet to the water heating plant. The pipe work must be cleared of foreign matter before
connection.
Where solar preheat forms a part of the system particular attention needs to be given to the cold water supply
and warm water return lines to the warm water unit. Refer to the diagrams on pages 15 and 16
INLET CONNECTIONS
Connections can be made directly to the warm water unit without the need for disconnection unions.
Note: It is recommended to install a full-flow gate or ball valve in the cold and hot water lines to the warm water
unit to facilitate cleaning of the line strainers.
IMPORTANT: A 'loose jumper' type isolating valve MUST NOT be installed in the cold water supply line to the
warm water unit. This line is utilised to divert part of the building warm water return back to the main water
heating plant for re-heating. A loose jumper can act as a non-return valve which will interfere with the correct
operation of this function
Connect the cold supply to the pipe marked COLD on the warm water unit. Connect the hot water line from the
water heating plant to the pipe marked HOT on the warm water unit.
INSTALLATION
SUPPLIED
COLD WATER CONNECTION DETAILS
18