6
– MAINTENANCE (ROUTINE AND SPECIAL)
COD.
30Z12/24.B.2021
EN
THE PRESENT MANUAL BELONGS TO -
Schenker Italia
- ALL RIGHTS RESERVED
40
6.6 Antifreeze procedure (Winterizing procedure in cold climate - under 5°C)
It is recommended to first perform the normal shutdown procedure by using SC1
in order to prevent the system
from the creation of organic and inorganic sediments, as well as inhibit the growth of bacteria that could reduce
the reverse osmosis membranes efficiency.
After this operation, the system must be flushed and filled with an antifreeze.
The recommended antifreeze product is a solution of
propylene glycol and unchlorinated water
.
The ideal concentration of propylene glycol is
-
45% (for temperatures down to - 20°)
-
55% (for temperatures down to - 30°).
ATTENTION
Do not use ethylene glycol as this substance is toxic and not-degradable.
The total volume of the solution must be about 15 litres.
The procedure is similar to the one used for chemical washing with SC1 and SC2 products:
1.
Prepare the solution carefully by mixing the propylene
glycol with 15 litres of unchlorinated water
and by
following the concentration suggested above.
2.
Disconnect the drain hose and the pumps suction hose.
3.
Connect two hose pieces to the drain and to the pump
suction.
4.
Insert the end side of the hoses into the bucket,
verifying that the hoses have been properly
dipped in the solution and that they do not inhale air.
5.
Open the depressurization valve.
6.
Start the watermaker.
7.
Leave the unit running for approx. 5 minutes.
8.
Stop the unit and connect the original hoses. The
antifreeze solution must stay in the system. Take care
to not leave the system empty when reconnecting the
hoses.
HYDRAULIC SCHEME FOR
WINTERIZING PROCEDURE
FIG. 6-2
ATTENTION
Before proceeding with any kind of service, it is strongly recommended to read carefully the
instructions contained in this manual.