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25
as this will adversely impact the relative heat transfer
efciency of the solution.
Generally, for an extended margin of protection, you
should select a temperature that is at least 5°F lower
than the expected lowest ambient temperature. These
gures are examples only and should not be regarded
as specications. As conditions are not within our
control, neither Rheem nor Dow Chemical guarantees
that freeze damage may not occur at temperatures
other than shown.
Water used to dilute the HTF must meet certain
minimum standards for purity. Impurities in the
dilution water can increase metal corrosion, reduce the
effectiveness of corrosion inhibitors, increase inhibitor
P.12
and fill the collector loop with water. The isola-
tion ball valve (No. 10) remains closed at this
point. While the hose is still connected to the
upper charge valve and the water is running,
open the lower purge/drain valve (No. 11) and let
the water run out until it is free of impurities or
debris that might have entered the piping as the
components were plumbed. Run the water long
enough to eliminate any air bubbles that may be
trapped in the system.
Close the lower purge/drain valve. The collector
loop now has been subjected to city pressure and
the pressure gauge should read somewhere in
the range of 50 - 75 PSI in most cases (No. 7).
Make a final inspection of the collector plumbing
connections to ensure that there are no leaks
anywhere in the collector loop piping.
4.12.3 After you have determined the integrity
of the entire piping system turn on the circulat-
ing pump. Do this by setting the manual switch
within the controller to the “on” position. Run
the pump for a full five minutes and carefully
check to ensure there is proper fluid flow and
that all the air has been purged from the solar
fig.19
ELECTRICAL COMPONENTS