18
Maintenance
Winterization
There are several methods of winterization, some of which work better than others. The four
various methods employed are:
1. Use of pressurized air to force water to be discharged through the overboard thru-hull fitting.
2. Use of the seawater pump to pump anti-freeze solution through the system and discharging
through the overboard thru-hull fitting.
3. Use of pressurized air injected at the overboard discharge fitting and the water being
discharged through the seawater intake fitting.
4. Pumping of anti-freeze solution into the overboard thru-hull fitting, and discharging through
the intake thru-hull fitting.
Since our systems are designed to be self-purging, a method which causes the anti-freeze solution
to flow downward is the method of choice. By this means, the anti-freeze solution will displace
any water trapped and eliminate the possibility of freezing in hidden areas. In addition, when the
system is utilizing a magnetically driven impeller, the impeller should be removed from the wet
end assembly, wiped with an alcohol solution, and stored in a warm, dry area until
commissioning takes place.
For the purpose of protecting the environment, collect all discharged liquids via a suitable
containment vessel. Recycle the anti-freeze solution after having tested and it is determined that
it meets the freeze protection parameters required in your specific area for freeze protection.
Dispose of unusable anti-freeze properly.
Seawater Strainer
Marine Air Systems recommends the use of a suitable seawater strainer in all seawater circuits.
This seawater strainer, when installed before the seawater circulation pump protects the pump
from contaminants and premature failure from these contaminants. Insure that your seawater
pump receives adequate seawater by periodically cleaning the sea strainer basket. Seawater
systems installed without a seawater strainer device of the proper size or no seawater strainer, are
not in compliance with Marine Air Systems’ recommended installation practices. This non-
compliance will void the warranty on the Marine Air Systems’ components installed in that
particular application.
Return Air Filters
The purpose of the return air filter is to remove debris from the air prior to the air being drawn
across the evaporator coil and fins. Dust and lint can clog and reduce air flow across the
evaporator coil and result in poor performance of the air conditioning unit. Restricted air flow
may cause head pressures to rise and even cause excessively higher amperage, which may
ultimately result in activation of the protection device which will prevent further damage. To
clean the filter, remove the filter from the return air grill, rinse with water, air dry, and reinstall.
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