Collector Flush, Leak Check And Fill Procedure - oventrop OVSOL System 5 Manual

Collector Flush, Leak Check and Fill Procedure

Before proceeding with the instructions outlined in this section, the solar storage tank should be
filled with water. The collector loop then should be leak checked, flushed, and filled. A Regusol
"fill and flush" valve should be installed for system charge-up. Filling or "charging up" a solar
closed loop incorporates a 1/2 HP utility pump available through most Oventrop Dealers.
Leak Check and Flush
1. To assure there are no leaks, air test the system to approximately 60 PSI. Check and repair
any leaks. When the solar loop is leak-free, release air and flush system with tap water.
2. Before filling the collector loop with antifreeze solution, it must be flushed free of any flux,
copper filings, or debris. Straight tap water may be used for this purpose.
3. To perform this step hook up a hose from tap faucet to fill port and run another hose from the
drain port to a drain or outdoors. Close center ball valve on "flush and fill." Open water tap to
begin flushing. Flush the system with tap water for approximately 10 minutes to assure there is
no solder, flux, or debris left within the collector loop piping.
This step may also be used to cool the collectors before filling the system with propylene glycol.
Fill Procedure
Charging the collector loop will
require approximately 3-4
gallons of Oventrop NT-40
antifreeze. It is a premixed
water-propylene glycol solution
of 40% propylene glycol to 60%
water and will provide freeze
o
protection to -6 F. No mixing is
necessary.
If collector loop is to be charged
during the sunlight hours, col-
lectors should be covered for at
least one hour before beginning;
or the collector may be cooled
with water using procedure in
step 3 (above).
Connect pressure side of charge
pump with washing machine
hoses to the fill port. From suc-
tion side of charge pump, attach
another hose to the bucket of
the propylene glycol solution. Attach another hose from the drain port to an empty bucket. If the
system was just flushed with water, drain down the water pressure to prime the charge pump.
Drain water pressure into empty buckets.
Set up for filling with solar heat transfer fluid. Turn center ball valve of "Regusol fill & flush"
perpendicular to have propylene glycol flow throughout solar closed loop.
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