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Dometic Passport I/O Legacy - User Manual

Dometic Passport I/O Legacy
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MARINE
CONTROL UNITS
L-5508 | Form No. 341205 20210420 | ©2021 Dometic Corporation
WARNING
Cancer and Reproductive Harm
www.P65Warnings.ca.gov
Passport I/O Legacy, Passport I/O Compact,
AH-Passport I/O Legacy, AH-Passport I/O Compact
EN
Passport I/O Digital Controls
Installation and Operation Manual ........2

Table of Contents

Questions and Answers

  • L
    Lauren HallAug 17, 2025
    Why Dometic Passport I/O Legacy Marine Equipment system does not power up?
    • A
      amanda89Aug 17, 2025
      If your Dometic Marine Equipment system isn't powering up, there are several potential causes: * The air conditioning unit’s circuit breaker might be off. Turn it on at the ship’s panel. * The display might not be turned on. Ensure the display is on. * The terminal strip could be miswired. Check the wiring diagram and correct if necessary. * The input-line voltage may be insufficient. Check the power source for proper voltage and verify the wiring and terminals. Use a voltmeter to confirm the power at the unit matches the power source. * An electrical component might have failed. A technician should inspect the display, cable, and circuit board, looking for a red light on the circuit board.
  • V
    vsandersAug 19, 2025
    What to do if Dometic Marine Equipment unit does not cool?
    • A
      Alyssa RandallAug 19, 2025
      If your Dometic Marine Equipment unit is not cooling, consider these potential causes: * The display might be set to heat-only. Change the parameters on the display or press the Mode button to set COOL or AUTOMATIC mode. * The seawater temperature could be too high. Remember, this air conditioning unit can effectively cool your boat in water temperatures up to 90 °F (32 °C). * There might be a loss of refrigerant gas. Check the air conditioning unit for a refrigerant oil leak and call for service. * (For CW systems only) The chilled-water loop might be inadequately cooled, or the chiller system is not in the proper mode of operation. Be sure the chiller is in COOL mode.
  • T
    Tony HendersonAug 28, 2025
    Why is there a lack of airflow in Dometic Passport I/O Legacy Marine Equipment?
    • M
      Michael AndersonAug 28, 2025
      If you're experiencing a lack of airflow in your Dometic Marine Equipment, consider the following: * The airflow might be blocked or restricted. Remove any obstructions in the return-air stream. Clean the return-air filter and grille. Check for crushed or restricted ducting. * The fan speed might be set to manual low. If the fan speed is set to manual low, raise the speed to a higher setting or set to AUTOMATIC mode. Or, increase the minimum low speed in the program parameters. * The fan coil may be iced. See “The fan coil is iced” in this table.
  • E
    ericrichardsAug 30, 2025
    What to do if Dometic Passport I/O Legacy Marine Equipment pump does not shut off?
    • E
      Elizabeth RamirezAug 30, 2025
      If the pump in your Dometic Marine Equipment system does not shut off, here are a couple of potential causes: * The circuit board might be shorted. Call service to verify if a relay on the circuit board is shorted or if the pump relay board is defective, if applicable. * The pump parameter on the display could be set for the pump to run continuously. Change the parameter on the display so the pump cycles with the compressor.
  • M
    Michelle FrazierSep 2, 2025
    Why Dometic Passport I/O Legacy condenser coil is iced in heat mode?
    • M
      Michael AdamsSep 2, 2025
      If the condenser coil in your Dometic Marine Equipment is iced while in heat mode, it could be because the seawater temperature is below 40 °F (4 °C). If this is the case, shut down the system to prevent damage to the condenser and allow the coil to defrost.
  • T
    Tracy HawkinsSep 5, 2025
    What to do if Dometic Passport I/O Legacy Marine Equipment air conditioning unit does not respond to display changes?
    • M
      Matthew BookerSep 5, 2025
      If your Dometic Marine Equipment air conditioning unit isn't responding to changes entered on the display, consider these possibilities: * The display may be experiencing a power interruption, voltage frequency fluctuation, electromagnetic interference from other equipment, or similar power-related issue. Perform a factory reset of the display. * The display-cable plugs might not be making contact. With the power off at the circuit breaker, remove the connector and inspect it. * The display buttons may not function because the display is locked. Unlock the display.
  • R
    Rachel ShieldsSep 7, 2025
    Why Dometic Passport I/O Legacy fan coil is iced?
    • D
      danny48Sep 7, 2025
      If your Dometic Marine Equipment fan coil is iced, here are a couple of possible reasons: * The humidity level might be set too high. Close the hatches and doors. * The supply air could be short-cycling. Redirect the supply air so that is not blowing in or near the return-air stream. Seal any air leaks on the duct.
  • S
    Steven ProctorSep 12, 2025
    Why Dometic Passport I/O Legacy display does not show the correct room temperature?
    • J
      Jonathan MyersSep 12, 2025
      If the display on your Dometic Marine Equipment isn't showing the correct room temperature, here are some potential causes: * The display might be showing a code for a faulty air sensor. Replace the air temperature sensor. * If the temperature displayed is too high (within 50 °F above the actual temperature), use calibration parameter 4 to adjust. * If the temperature displayed is too low (within 50 °F below the actual temperature), use calibration parameter 4 to adjust.
  • I
    iacevedoSep 13, 2025
    What is the Dometic Passport I/O Legacy filter reminder?
    • B
      Brian Hall MDSep 13, 2025
      The filter reminder on your Dometic Marine Equipment indicates that the timer setting to clean or replace the filter has been reached. Clean or replace the filter and reset the filter hours.
  • C
    corey31Nov 21, 2025
    What to do if Dometic Passport I/O Legacy Marine Equipment system runs continuously?
    • E
      Eric HenryNov 21, 2025
      If your Dometic Marine Equipment system is running continuously, consider the following possible causes: * The unit may not be able to reach the set point. Close all port holes and hatches. Adjust the set point so it is not too low for cooling or too high for heating. * The seawater temperature might be too high for cooling or too low for heating. This air conditioning unit can effectively cool your boat in water temperatures up to 90 °F (32 °C) and heat in water as low as 40 °F (4 °C). * The alternate air temperature sensor may not be located properly. Verify the display location with the criteria found in the installation section of this manual. Install an alternate air temperature sensor if necessary. If an alternate air temperature sensor is already installed in the air stream, ...

Summary

1 Explanation of Symbols and Safety Instructions

1.1 Recognize Safety Information

Explains the safety alert symbol and its importance for avoiding injury.

1.2 Understand Signal Words

Defines signal words (DANGER, WARNING, CAUTION) to indicate hazard levels.

1.3 Supplemental Directives

Provides essential guidelines and directives for safe installation and operation.

1.4 General Safety Messages

Lists critical safety warnings for electrical shock, fire, and explosion hazards.

2 Intended Use

3 General Information

3.1 Tools and Materials

Lists recommended tools and included/additional parts for installation.

3.2 Display Features

Explains the components and functions of the Passport control displays.

4 Specifications

4.1 Product Dimensions

Provides physical dimensions for display panels and cut-out sizes.

4.2 Cable Length

Lists standard and maximum cable lengths for display and sensor connections.

4.3 Available System Inputs

Outlines the system inputs (sensors, pressure) for DX and CW configurations.

4.4 Operational Specifications

Details operating ranges, accuracy, voltage, and power consumption.

5 Wiring Diagrams

6 Installation

6.1 Choosing a Display Panel Location

Provides criteria for selecting an optimal location for the display panel.

6.2 Preparing the Wall

Guides on cutting the wall opening based on model dimensions for installation.

6.3 Installing an Optional Sensor

Instructions for mounting and connecting optional sensors to the control board.

6.4 Mounting the Display Panel

Details the steps for securely mounting the display panel to the bulkhead.

7 Operation

7.1 Understanding the Heating and Cooling Cycles

Explains how heating and cooling cycles function in different system types.

7.2 Understanding the Service Utility Commands (DX Systems Only)

Covers self-test, hour meter, and service history log features for DX systems.

7.3 Turning on the Passport Control

Details the procedure for powering on the Passport control unit.

7.4 Choosing the Passport Control Operation

Explains how to select and understand different operating modes for the system.

7.5 Using the Passport Control Display Panel

Explains button combinations for activating various functions on the display.

7.3 Programming the Passport Control

7.3.1 Entering Programming Mode

Step-by-step guide on how to access the programming menu.

7.3.2 Setting New Parameter Values

Instructions for adjusting and saving parameter settings.

7.3.3 Restoring Default Parameter Values

Procedures to restore last memorized or factory default settings.

7.3.4 Exiting Programming Mode

Methods for safely exiting the programming menu.

7.3.5 Selecting a Parameter

Lists factory default parameter settings and their ranges for configuration.

7.3.6 Identifying Programming Fault Codes

Explains how to identify and interpret fault codes for system diagnostics.

7.4 Navigation Tree

8 Maintenance

8.1 Testing the Passport Control

Instructions for verifying the Passport control and system functionality.

8.2 Checking the Return-Air Filter

Guide on inspecting and cleaning the unit's air filter.

8.3 Energizing the Reversing Valve Units (DX Systems Only)

Procedure to cycle the reversing valve for system maintenance.

8.4 Checking the Seawater Strainer (DX Systems Only)

Steps to ensure adequate seawater flow and maintain the strainer.

8.5 Cleaning the Condenser Coil (DX Systems Only)

Details methods for cleaning the condenser coil to prevent fouling.

8.6 Winterizing the System (DX Systems Only)

Explains procedures for winterizing the system with antifreeze solution.

9 Troubleshooting

10 Disposal

11 Warranty Information

Dometic Passport I/O Legacy Specifications

General IconGeneral
BrandDometic
ModelPassport I/O Legacy
CategoryMarine Equipment
LanguageEnglish

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