Rheem Guardian Warm Water Owner's Manual And Installation Instructions page 19

INSTALLATION
UV CHAMBER
Depending on the model, a total minimum dimension of 2,000mm or 2,600mm is required for the installation of
the UV system to facilitate installation and removal of the UV lamp and quartz thimble. (Refer to UV Owners
Guide and Installation Instructions).
The UV system power box must be installed within 1.5 m of the UV chamber. The power box is supplied with a
1.5 metre power cord and requires a 240 V general power outlet (GPO) to be located within this distance.
The UV chamber may be installed in the vertical or horizontal orientation however not upside down, ie with the
25mm lamp opening facing downwards.
Noting the requirements for the positioning of the power box, select a suitable position for the UV chamber and
then mark, drill and mount it on the wall.
OUTLET CONNECTIONS
Connect from the pipe marked WARM WATER on the bottom of the warm water unit to the inlet of the UV
chamber with an isolation valve and disconnection union.
Note: It is recommended a tap be installed on a branch between the outlet of the warm water unit and the inlet of
the UV chamber to facilitate local testing.
Fit a union and isolating valve to the outlet of the UV chamber and connect to the building warm water flow line.
Note: If a UV system is not a part of the installation, an isolating valve MUST be fitted before connecting to the
building flow line.
WARM WATER BY-PASS
To facilitate continuing warm water supply whilst servicing the UV unit, a warm water by-pass should be installed
prior to the isolating valve at the inlet and after the isolating valve at the outlet of the UV unit. It is recommended
to remove the handle from the by-pass isolating valve and place it in the warm water cabinet during normal
operation.
WARM WATER RETURN
Connect the building warm water return line via the circulator to the pipe marked WARM WATER RETURN on
the warm water unit. The circulator must have isolating valves and disconnection unions fitted to facilitate
isolation and removal.
Note: A non-return valve is fitted in the warm water return line within the warm water unit and an additional non-
return valve is not required.
HOT WATER BY-PASS
In the interest of safety a hot water bypass between the water heaters and the warm water outlet should not be
installed. The thermostatic mixing valves can be adjusted to supply high temperature water for sanitisation if
required.
UV POWER BOX
The power supply to the UV unit must not be switched on until the system is filled with water.
REFER TO THE UV OWNERS GUIDE AND INSTALLATION INSTRUCTIONS FOR DETAILS ON
INSTALLING THE UV POWER BOX.
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