Dometic Passport I/O Compact User Manual

Passport I/O Control Operations Manual System Components
L-2231 ENGLISH 15
MAINTENANCE
SYSTEM COMPONENTS
REVERSING VALVE
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.
SEAWATER STRAINER
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.
CONDENSER COIL
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.
"ASF" is displayed.
(Air Sensor Failure)
1. Indicates failed face plate air sensor, alternate air sensor or display cable.
Unplug alternate air sensor if installed or plug in alternate air sensor if not installed.
Try another display cable.
2. Damaged jack/socket in display head or on circuit board. Visually check to see
that pins inside socket are not bent or corroded. Repair or replace display or circuit
board if needed.
"FIL" is flashing
(Filter Reminder)
Filter needs to be cleaned or replaced. Clean or replace filter, and reset P-21 to "00”.
"HPF" is displayed.
(High Refrigerant Pressure)
1. High-pressure switch is open (in cooling) due to improper seawater flow.
Strainer or intake may be plugged, seacock may be closed. Check seawater hose for
kinks or collapses. Verify pump operation; check pump circuit breaker if applicable.
2. High-pressure switch open (in heating) due to improper airflow. Remove
obstructions in return air stream. Clean air filter and grille. Check for crushed or
restricted ducting. Ducting must be as straight, smooth and taut as possible.
If problem persists, reprogram Low Fan Speed Limit for maximum value. Set P-3 to
64, and set the reverse fan speeds during Heating Mode parameter P-13 to “rEF", or
manually set fan speed to high.
"LAC" is displayed.
(Low AC Voltage)
1. Supply voltage is too low. Verify power to unit with multimeter.
2. Voltage is improperly calibrated. Verify that P-22 matches voltage reading to unit
with a multimeter. Adjust P-22 if necessary.
"LPF" is displayed.
(Low Refrigerant Pressure)
1. Low-pressure switch is open due to low seawater and/or low return air
temperatures. Try restarting the air conditioning unit, the optional low pressure
switch has a ten minute shutdown time delay that may be in effect.
2. Low pressure switch is open due to loss of refrigerant. Check air conditioning unit
for refrigerant oil leakage, call service technician.
"PLF" is displayed.
(Low Pump Flow)
1. Condenser coil is too hot. Verify that unit is getting water flow, and that condenser is
not fouled.
2. Thermistor is damaged. Unplug water sensor if installed. Try another if it is
available.
3. Damaged jack/socket on circuit board. Visually check to see that pins inside
socket are not bent or corroded. Repair or replace circuit board if needed.
Table 4: Digital-Controls Troubleshooting (continued)
PROBLEM POSSIBLE REASON/SOLUTION

Dometic Passport I/O Compact Specifications

General

Brand	Dometic
Model	Passport I/O Compact
Category	Control Unit
Language	English