Rheem Guardian Warm Water Owner's Manual And Installation Instructions page 8

MINIMUM COLD WATER TEMPERATURE: 1°C
Maximum Hot Water Temperature: 70°C*
Minimum Hot Water Supply Temperature: Blend water temperature plus 15°C
Maximum Cold Water Supply Temperature: Blend water temperature less 15°C
Thermostatic Control Range: approximately 25°C - 60°C
Optimum Thermostatic Control Range: 35°C - 50°C
*Note! For optimum performance reasons it is recommended that the maximum hot water temperature is limited
to 65°C.
Caution! During thermal disinfection the mixing valve can operate up to 85°C for short periods. Ensure safety
precautions are followed during discharge. Chemical disinfection agents e.g.chlorine/chloramines combined with
higher temperatures will affect the life of the product adversely and could detrimentally affect the thermostatic
performance.
WATER SUPPLIES
SATURATION INDEX
The saturation index is used as a measure of the water's corrosive or scaling properties.
In a corrosive water supply, the water can attack copper parts and cause them to fail.
Where the saturation index is less than –1.0, the water is very corrosive and the Rheem warranty does not apply
to a Guardian Warm Water system.
In a scaling water supply calcium carbonate is deposited out of the water onto any hot metallic surface.
Where the saturation index exceeds +0.40, the water is very scaling. An expansion control valve must be fitted
on the cold water line after the non-return valve to protect and for the Rheem warranty to apply to the
temperature pressure relief valve and cylinder of the water heater connected to the warm water system.
Where the saturation index exceeds +0.80, the Rheem warranty does not apply to a Guardian Warm Water
system.
Water which is scaling may be treated with a water softening device to reduce the saturation index of the water.
Contact Rheem Service or their nearest Accredited Service Agent if a replacement warm water system is
required.
Refer to the Saturation Index chart on page 8Error! Bookmark not defined..
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