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No part of this publication may be reproduced, translated, stored in a retrieval system, or transmitted in any form or by any means 
electronic, mechanical, photocopying, recording or otherwise without prior written consent by Dometic Corporation. Every precaution 
has been taken in the preparation of this manual to ensure its accuracy. However, Dometic Corporation assumes no responsibility for 
errors and omission. Neither is any liability assumed for damages resulting from the use of this product and information contained 
herein.

Passport I/O Digital Control 
(for Direct Expansion Systems)

O

PERATIONS

 M

ANUAL

Passport I/O Compact

Passport I/O (legacy model)

Dometic Corporation
Rev. 20170816
L-2231 English
Part Number: 297200023

Summary of Contents for Passport I/O

Page 1: ...Corporation Every precaution has been taken in the preparation of this manual to ensure its accuracy However Dometic Corporation assumes no responsibility for errors and omission Neither is any liabil...

Page 2: ...Mode 6 Heat Mode 6 Moisture Mode 6 Fan Modes 6 Program Mode 6 USING PROGRAM MODE 6 Entering Program Mode 6 Exiting Program Mode 6 Changing Parameters 7 Memorizing New Program Parameters 7 Restoring Me...

Page 3: ...once to engage the system The display is blank when the system is off and indicates current room temperature when the system is on SET POINT Press the Up or Down button to set the desired room tempera...

Page 4: ...cators Table 1 Passport I O Display Diagram Legend 1 Cool Mode indicator 6 Temperature sensor 2 Fan indicator 7 Down button Lower temperature set point 3 Heat Mode indicator 8 Fan button 4 Digital dis...

Page 5: ...e when the cabin temperature is below the set point by 2 F 1 1 C and will continue to heat until the temperature equals the set point The cabin temperature must exceed the set point by at least 4 F 2...

Page 6: ...e remote air sensor overrides the display s built in sensor The standard cable length for the remote air sensor is 7 feet 2 1m 1 Mount the remote air sensor in the return air stream behind the opening...

Page 7: ...cting AC power Service History Log With power to the unit disconnected press and hold the Fan button while reconnecting the AC power to view the service history log Press the Power button once to exit...

Page 8: ...operate the fan for air circulation when no cooling or heating is desired From the Off Mode press and release the Fan button to start fan speed 1 Press and release again to increment through the other...

Page 9: ...tings refer to the factory defaults listed in Table 2 on page 10 and reset the parameters manually SOFTWARE IDENTIFICATION The control s software version such as A24 appears in the display for one sec...

Page 10: ...ndling Codes on page 11 for further details on system lockout P 8 De Icing Cycle The de icing cycle prevents ice build up on the evaporator coil during extended periods of cooling operation Installati...

Page 11: ...e same as in cooling by programming P 13 nor which represents normal fan operation during reverse cycle heating P 14 Cycle Fan With Compressor You can program the fan to run continuously when the syst...

Page 12: ...revision A25 and newer This parameter creates a larger temperature differential between cooling and heating operation in Automatic Mode It is adjustable between 4 F and 40 F and is OFF by default Typ...

Page 13: ...isplay Temperatures in Fahrenheit or Celsius F F Fahrenheit Displayed C Celsius Displayed P 12 Cycle Pump With Compressor or Continuous Pump OFF OFF Cycle With Compressor On Continuous Pump P 13 Rever...

Page 14: ...urrent cabin temperature This starts the compressor and seawater pump 7 Check for a steady solid stream of water from the overboard discharge 8 Verify that there is steady airflow out of the supply ai...

Page 15: ...Clean return air filter and grille Check for crushed or restricted ducting ducting must be as straight smooth and taut as possible 12 High pressure switch is open in heating due to high seawater tempe...

Page 16: ...P 14 Note When configured for electric heat after a heat cycle ends the fan will stay on for 4 minutes even if the fan is set to cycled operation Fan is not running but the compressor is Failed triac...

Page 17: ...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...

Page 18: ...h 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 discha...

Page 19: ...the example above the complete Hour Meter reading is 2 163 hours 4 The display returns to its last operating state before power was removed Maximum recordable time is 65 536 hours at which point the...

Page 20: ...perating Temperature 0 F 17 8 C Maximum Ambient Operating Temperature 180 F 82 2 C Maximum Rh Conditions 99 Non Condensing Power Consumption Less Than 5 Watts DIMENSIONS Compact model Display Panel 3...

Page 21: ...2231 ENGLISH 19 SAMPLE WIRING DIAGRAMS Figure 2 Sample Passport I O Digital Control Wiring Diagram IMPORTANT This is a sample diagram Wire colors may vary See unit s specific diagram located in elect...

Page 22: ...System Inputs Passport I O Control Operations Manual 20 L 2231 ENGLISH Figure 3 Sample U Board Passport I O Digital Control Wiring Diagram See Parameter P 15 for more information on Electric Heat...

Page 23: ...NOTES...

Page 24: ...rineSales dometic com 24 7 TECH SUPPORT FOR UNITED STATES AND CANADA 8 00 AM to 5 00 PM Eastern Time 1 800 542 2477 After hours and weekends 1 888 440 4494 INTERNATIONAL SALES AND SERVICE Europe and t...

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