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4.11.4 Mix the Dowfrost HD propylene glycol and
distilled water mixture in accordance with Table 4
and Table 5 in a large clean bucket. You will need a
second empty bucket as well. The charging process
also will require a low ow diaphragm pump (Flojet
or equal) to ll and pressurize the collector loop.
Connect the discharge side of the pressure pump
to the upper charge faucet (No. 9) Place the pump
suction side hose in the glycol solution. Close the
isolation ball valve (No. 10) and connect a second
hose to the lower charge faucet (No. 11). Place the
other end of the hose in the empty bucket.
tank make sure that all the components are
accessible and easy to reach. Provide for clear
access to the storage tank, pump, expansion
tank, mixing valve, time clock and other key com-
ponents. If a component in the potable water
side of the system may require future service or
maintenance make the connections with brass
unions. Use only brass nipples and unions and
copper and brass fittings in plumbing the solar
storage tank and expansion tank. The use of gal-
vanized fittings or nipples, di-electric unions,
CPVC, PVC or other plastic pipe is prohibited.
Hard copper connections to the city cold water
supply line and the home hot water feed lines are
recommended. The gaskets in standard water
heater flex hose connectors can become brittle
and compressed over time and begin leaking on
the water heater. If not detected in a timely
P.9
fig.17
DOUBLE TANK SYSTEM SCHEMATIC