INSTALLATION
27
Installing the Water Heater as a Pre-Heater
This water heater can be used as a pre-heater to a new or existing in-series booster water heater provided:
• The in-series booster water heater is;
◼ thermostatically-controlled, and
◼ suitable to be used as an in-series booster water heater for a solar water heater.
• The operating pressures of the two water heaters are compatible or reduced to the lower rated of the two
water heaters
• The in-series booster water heater has sufficient thermal capacity to supply the hot water requirements of
the application during periods of low or no solar gain.
• A temperature-operated bypass valve is installed prior to the in-series water heater if this water heater
has either an over temperature energy cut-out which can be permanently disabled by high temperature
hot water or a maximum recommended inlet supply temperature less than the temperature of water which
can be supplied by this solar water heater.
It will be necessary to check with the manufacturer of the in-series water heater as to its suitability for use as
an in-series booster to this solar water heater.
FREEZE PROTECTION
The 52H series systems are suitable for installation in areas subject to frost or freeze conditions and is
protected against these conditions by its closed circuit fluid. The closed circuit fluid concentrate is used to
lower the freezing temperature of the closed circuit fluid and provides protection against freezing. Freeze
conditions occur below 6°C. Only closed circuit fluid concentrate supplied by Rheem is permitted to be used
in the closed circuit system.
The 52H series systems are supplied with Coolblend heat transfer fluid concentrate. During installation and
commissioning the Coolblend concentrate is blended with water in the appropriate proportion to achieve the
required frost protection. The table on page 65 lists the percentage of Coolblend concentrate fluid in the closed
circuit of each system and the recommended minimum ambient temperature for the system, for the number of
bottles supplied with each system If a lower temperature protection is required, additional Coolblend
concentrate will be needed. It is recommended the storage cylinder be filled with water before charging the
closed circuit with closed circuit fluid. Refer to “Closed Circuit Fluid” on page 65.
The system has NO WARRANTY for freeze damage if non Rheem approved closed circuit fluid has been used
or if the closed circuit fluid has been incorrectly mixed (refer to “Terms of the Rheem Warranty” on page 4).
Note: The 52L series systems do not have freeze protection. These systems are not suitable for installation in
areas subject to frost or freeze conditions. Freeze conditions occur below 6°C. The system has NO
WARRANTY for freeze damage (refer to “Terms of the Rheem Warranty” on page 4).
SOLAR WATER HEATER STORAGE TANK LOCATION
The solar storage tank is designed to be installed on the roof directly coupled to the solar collectors. The solar
water heater should be installed close to the most frequently used outlet and its position chosen with safety
and service in mind. The solar water heater should be installed with a north facing aspect (refer to “Solar
Collector Location” on page 40).
The solar water heater must not be installed with an inclination of less
than 10° or greater than 45°. The water heater may not thermosiphon
or will not perform efficiently.
Clearance must be allowed for servicing of the solar storage tank.
Make sure the temperature pressure relief valve lever is accessible
and the side cover, thermostat and booster heating unit can be
removed for service. You must be able to read the information on the
rating plate.
Remember you may have to remove the entire solar storage tank later
for servicing. The solar storage tank must be capable of being
removed without structural alteration to the building or major
alteration to the piping.
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