Rheem 180 Owner's Manual And Installation Instructions page 65

CLOSED CIRCUIT SYSTEMS
The solar collectors and tank heat exchanger are connected together to create a sealed, closed circuit that is
entirely separate from the potable water in the storage cylinder. The circuit is filled with Coolblend heat transfer
fluid concentrate and water. Under no circumstances can any fluids other than provided by Rheem be used as
the heat transfer fluid. Only potable water can be used in conjunction with the heat transfer fluid concentrate.
Only trained and qualified installers are permitted to fill the closed circuit.
Warnings: Before charging the solar heat exchanger and collectors with the closed circuit fluid:
Important: It is recommended the solar storage tank must be filled with water and pressurised.
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The solar collectors must be covered with an opaque material.
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Covering the collectors prevents solar gain and heating from occurring, keeping the collectors and
closed circuit fluid cooler during the commissioning procedure. This will reduce the risk of scalding
and burn injury by preventing the collector surface and closed circuit fluid from becoming very hot.
If not covered with an opaque material, it is possible for the solar collectors to generate enough heat
to close the Over Temperature Protection valve (if one is installed) during the commissioning
procedure. This will create a vapour lock that prevents complete filling of the closed circuit, which will
reduce system performance and lead to customer complaints.
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The Over Temperature Protection valve (if one is installed) must be covered with a cloth soaked in
cold water.
This will assist in keeping the valve as cool as possible, so it remains in the open position during the
commissioning procedure.
Coolblend Heat Transfer Fluid and Concentration
The required quantity of Coolblend heat transfer fluid concentrate must be mixed with the correct quantity of
water to achieve the correct closed circuit fluid for the system. Failure to mix the closed circuit fluid correctly
may void the Rheem warranty.
The Coolblend heat transfer fluid concentrate is supplied at a quantity of 1.5 litres per bottle. The table below
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.
Generally, the concentration of Coolblend concentrate in the closed circuit required for a minimum ambient
temperature of -7°C is 19%, -10°C is 25%, -12°C is 30%, and -17°C is 37%. Coolblend concentrations over
50% become proportionally less thermally efficient and are not recommended.
An additional bottle of Coolblend heat transfer fluid concentrate may need to be purchased and added to the
closed circuit if the installation is in an area which may experience a temperature lower than that shown in the
table below. Failure to mix the correct volume of Coolblend concentrate for the minimum temperature which
may be experienced may void the Rheem warranty.
The Coolblend concentrate can be siphoned into the closed circuit system using a known quantity of fluid.
System
52H180 1 x NPT200, L, CSA2007 collector
52H180 1 x SPA2000 collector
52H300 2 x NPT200, L, CSA2007 collectors
52H300 2 x SPA200 collectors
52H300 3 x NPT200, L, CSA2007 collectors
Closed Coolblend
Circuit Concentrate
Volume Supplied
4 litres 1 x 1.5 litre bottle
6 litres 1 x 1.5 litre bottle
8 litres 1 x 1.5 litre bottle
12 litres 2 x 1.5 litre bottles
10 litres 2 x 1.5 litre bottles
65
COMMISSIONING
Percentage Minimum
Concentrate in Ambient
Closed Circuit Temperature
37% -17°C
25% -10°C
19% -7°C
25% -10°C
30% -12°C