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Chapter 4
TYPICAL A/C INSPECTION TIPS
Seawater Strainer
The air conditioner seawater strainer located in the engine
room should be cleaned periodically of debris which can
inhibit or stop the
fresh sea water supply.
Always turn the sea-
cock handle to the
off position (90 de-
grees to the hose t-
ting) before cleaning
a seawater strainer.
Remove the basket by
turning the plastic cap
in a counterclockwise
direction. Set the cap and the O ring aside. Pull the basket
from the unit, rinse with water, air dry and reinstall. Sedi-
ment at the bottom can be removed by just turning the plug
in a counterclockwise direction. Place a container under
the strainer to catch the sediment. Coat the O rings with
waterproof grease containing a silicone or teon base.
Reinstall O rings along with the plug and plastic cap. Turn
on the seacock and check for leaks.
Return Air Filters
Once a month check the return air lter located on the
face of the evaporator. To clean rinse with fresh water, air
dry and reinstall.
PREVENT SEVERE INJURY OR DEATH!
DISCONNECT
ALL ELECTRICAL POWER SOURCES
BEFORE ATTEMPTING
TO OPEN, REPAIR OR REPLACE ANY
AIR CONDITIONING COMPONENTS.
Drain Pans
As noted on an earlier page the AC evaporator/condenser
features a 2” deep drain pan connected by a hose that runs
to a sump pump and eventually exits overboard. Periodi-
cally just like your home AC, the pan needs to be rinsed
clean of debris and possible mold.
You can use a purchased product made specically for
cleaning AC units. Disconnect the outlet hose from the
AC pan and install a made up hose (5/8” ) that will catch
the used solution to ll a small container. Dispose of the
container in accordance with federal, state and local regu-
lations. Pour the solution into the pan and allow time for
it to drain. Reconnect the original drain pan hose when
nished.
Condenser Coil Cleaning
Periodically the condenser coils are recommended to be
cleaned. This procedure should be done by a professional
since an acid solution must be used.
POSSIBLE PROBLEMS/SOLUTIONS (A/C )
1. No or little water is noticed at the thru-
hull ttings and a HPF fault code shows
on the display which means the high pres-
sure switch is open.
The strainer or intake hose may be
clogged, seacock may be closed a hose
may be collapsed or the AC pump may be defective.
Check AC pump breaker to verify pump is energized.
2. Air conditioner will not start. Ensure the proper AC
breaker is activated on the ship’s main control panel.
3. No cooling or heating. Lower or raise set point on ther-
mostat control to offset set point being satised. Check
for obstructed seawater ow. Remove discharge side of
pump hose to purge air (air-lock). Seawater temperature
too high for cooling and too low for heating.
4. Fan coil is iced. Raise or lower control set point. Clean
return air lter. Switch AC to heat until ice melts or as a
last resort use a hair dryer to melt ice as needed.
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