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MAINTENANCE
MAINTENANCE
S
C
YSTEM
OMPONENTS
R
EVERSING
Reverse-cycle (cooling and heating) units have a reversing valve that must be energized periodically to keep the internal parts
moving freely. To do this, switch the air conditioner unit into Heat Mode for a few seconds once a month.
S
EAWATER
Ensure your pump receives adequate seawater flow by regularly cleaning the strainer basket. Periodically check the overboard
discharge for a steady stream of water. Check seawater intake speed scoop for obstructions. Make sure hoses are not looped,
kinked or crushed.
C
ONDENSER
A marine-growth-fouled coil reduces efficiency, raising total system pressure and decreasing its ability to produce cold air.
1.
With the system turned off at the circuit breaker on the ship's panel, disconnect the inlet and outlet connections of the
condenser coil.
2.
Use chemical-resistant hoses (white PVC 5/8" I.D., etc.) to connect the inlet of the condenser coil to the outlet of a
chemical resistant, submersible pump (P-500 pump, etc.) and let the hose connected to the coil outlet flow freely into
the container mentioned below.
3.
Place a strainer or piece of screen over the inlet of the pump and submerse the pump into a container filled with a 5%
solution of muriatic or hydrochloric acid and fresh water or use a premixed over-the-counter solution. Use as large a
container as possible to hold the solution (5-25 gal [19-95 liters]).
4.
Power the pump and circulate the solution through the condenser coil for 15-45 minutes depending upon the size of
the coils and the extent of the contamination. Visual inspection of the solution in the container should indicate when the
contamination removal has stopped.
5.
Circulate fresh water through the coil to flush any residual acid from the system.
6.
Restart the system and check operational parameters to ensure thorough cleaning has taken place. Additional
cleaning may be necessary with extreme contamination.
R
-A
ETURN
IR
Check the return-air filter about once a month and clean as necessary. To clean the filter, remove it from the unit, rinse with
water, air dry and reinstall.
W
INTERIZATION
There are several methods of winterization, some of which work better than others. Any method that causes the antifreeze
solution to flow downward is the method of choice. By this means, the antifreeze solution displaces any trapped water and
eliminates the possibility of it freezing in hidden areas.
Choose the method that works best for you. In the following methods, the first two use a 50/50 nonpolluting biodegradable
antifreeze/water solution:
•
Pump antifreeze solution into the overboard thru-hull fitting, and discharge through the intake thru-hull fitting.
•
Use the seawater pump to pump antifreeze solution through the system and discharge through the overboard thru-hull
fitting: Close seacock, remove hose from strainer discharge, raise hose above pump (so pump does not lose its prime)
and pour in antifreeze solution. Pump solution through system. The strainer and hose to seacock need to be drained of
water.
•
Use pressurized air injected at the overboard discharge fitting to force system water through the seawater intake fitting,
thus expelling any trapped water from the system.
CAUTION
Avoid spilling or splashing the solution. Follow all warnings and recommendations given by the
manufacturer of any acids or premixed solutions.
NOTE: For the purpose of protecting the environment, dispose of any contaminated acid solutions in accordance with
federal, state and/or local regulations.
36
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SYSTEMS ONLY
Smart Touch Cabin Control Installation & Operations Manual
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L-3380 ENGLISH
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