23
EN
Passport I/O Digital Controls Maintenance
8 Maintenance
This section describes routine activities to maintain
properly working system components.
WARNING: ACID HAZARD . Failure to obey the
following warnings could result in death or
serious injury .
• Follow all warnings and recommendations given by
the manufacturer of any acids or premixed solutions.
• Dispose of any contaminated acid solutions
in accordance with federal, state and/or local
regulations.
• Avoid spilling or splashing any antifreeze solution.
Monthly
Task
Check the return-air filter.
Energize the reverse-cycle units.
Periodically - DX Only
Task
Check the seawater strainer function.
Clean the condenser coil.
Winterizing - DX Only
Task
Circulate antifreeze in the system.
8 .1 Testing the Passport Control
NOTICE:
For DX units only: do
not
turn the circuit
breaker or power supplied to the unit OFF and then
immediately turn it back ON. Allow at least five minutes
for the refrigerant pressure to equalize. Failure to obey
this notice could result in damage to the product.
1. Open the seawater-intake ball valve (seacock).
2. Turn the display OFF.
3. Turn the air conditioner circuit breaker ON.
I
If the seawater pump is on a separate circuit
breaker, be sure to turn it ON.
4. Turn the Passport control ON.
5. Press the
Fan
button.
6. Verify that the fan is running and that a steady airflow
is coming out of the supply-air grille.
7. Select a temperature set point lower than the current
cabin temperature.
8. Verify that a steady, solid stream of water is coming
out from the overboard discharge.
9. Verify that a steady airflow continues to flow out of the
supply-air grille.
I
If the Passport control is not functioning as
expected, refer to “Troubleshooting” on
page 25.
8 .2 Checking the Return-Air Filter
Check the return-air filter about once a month and clean
as necessary. To clean the filter:
1. Remove the filter from the unit.
2. Rinse with water.
3. Air dry the filter, then reinstall.
8 .3 Energizing the Reversing Valve
Units (DX Systems Only)
Energize the reverse-cycle (cooling and heating) units to
keep the internal parts moving freely.
To energize the reversing valve, switch the air
conditioning unit to HEAT mode for a few seconds every
month.
8 .4 Checking the Seawater Strainer
(DX Systems Only)
Ensure the pump receives adequate seawater flow. To
maintain proper flow:
1. Regularly clean the strainer basket.
2. Periodically check the overboard discharge for a
steady stream of water.
3. Check the seawater intake speed scoop for
blockage.
4. Ensure the hoses are not looped, kinked, or crushed.
