18
Extreme hard water
used as the
operating and make-
up liquid (Lime
content greater than
15 degrees of
hardness)
Soften the water or clean with 10% ethanoic acid on a
periodic basis.
To clean with ethanoic acid:
Drain and clean the system as described in Sections 10.1
and 10.3.3.
Lock out the power to the unit.
Wear protective gloves (10 percent ethanoic acid can
cause severe burns, handle with care).
Disconnect the pipe/hose from the liquid ring pump to the
top of the cooler at the cooler.
Fill the interior of the unit with 10 percent ethanoic acid,
taking all necessary precautions to avoid skin contact with
the acid. Fill the pump by adding the proscribed amount
(see Section 4.2) of ethanoic acid through the
disconnected supply hose using a plastic funnel.
Let the ethanoic acid sit in the pump for 30 minutes. Do
not allow to sit for more than 45 minutes, as the acid can
damage the seals of the pump.
During the 30 minute period, occasionally turn the impeller
by hand (using the cooling fan to turn the impeller).
Drain the ethanoic acid from the pump by removing the
drain plug and collecting the acid in a suitable container.
Reconnect the drain plug, hose and reassemble the
system.
Fill with water and clean as described in Section 10.3.3.
Re-commission the unit as described in Sections 6.9 to
6.13.
Or
Decalcify the entire system using granular citric acid.
If lime build-up is experienced in the entire system, it may
be necessary to de-calcify the entire system. Do so as
follows:
Add the proscribed amount (Section 4.2) of citric acid to
the sump (dissolve first in water and pour the resulting
solution into the operating liquid sump).
Operate the system for approximately 10 hours on the
citric acid solution.
Drain and clean the system as described in Section
10.3.3, taking care to dispose of the resulting citric acid
solution properly.
Re-commission the unit as described in Sections 6.9 to
6.13.
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