Dometic Radome ECU Installation, Operation & Maintenance Manual
Radome Environmental Control Unit
With Passport I/O Compact Digital Display
INSTALLATION, OPERATION & MAINTENANCE MANUAL
Dometic Corporation
Rev. 20170601
L-2283 English
Part Number 297200038
COPYRIGHT © 1997-2017 Dometic Corporation. All Rights Reserved.
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 insure 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.
Table of Contents
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
T
HIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
UNPACKING AND INSPECTION . . . . . . . . . . . . . . . . . . . 1
H
OW IT WORKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
S
AFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . 1
WARNINGS AND NOTICES . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION PROCEDURES . . . . . . . . . . . . . . . . . . 3
INTERNAL UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
EXTERNAL UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
E
LECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
THE DIGITAL CONTROL . . . . . . . . . . . . . . . . . . . . . . . . 3
NDICATORS AND BUTTONS . . . . . . . . . . . . . . . . . . . . 3
I
Cool Mode Indicator . . . . . . . . . . . . . . . . . . . . . 3
Fan Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Heat Mode Indicator . . . . . . . . . . . . . . . . . . . . . 4
Digital Display . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Set Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Air Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Fan Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
M
ODES OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . 5
Off Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
On Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cool Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Heat Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Automatic Mode . . . . . . . . . . . . . . . . . . . . . . . . 5
Moisture Mode . . . . . . . . . . . . . . . . . . . . . . . . . 5
Fan Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Automatic Fan Mode . . . . . . . . . . . . . . . . . 5
Manual Fan Mode. . . . . . . . . . . . . . . . . . . . 5
Fan-Only Mode. . . . . . . . . . . . . . . . . . . . . . 5
Cycled or Continuous Fan Operation . . . . . 5
Program Mode . . . . . . . . . . . . . . . . . . . . . . . . . 5
Important Programming Notes To Installer
and End User . . . . . . . . . . . . . . . . . . . . . . . 6
Using Program Mode . . . . . . . . . . . . . . . . . 6
Programming . . . . . . . . . . . . . . . . . . . . . . . 7
Programmable Parameters . . . . . . . . . . . . 7
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TROUBLESHOOTING GUIDELINES . . . . . . . . . . . . . . 11
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
C
ONDENSER COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
R
ETURN-AIR FILTERS . . . . . . . . . . . . . . . . . . . . . . . . 12
DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
W
IRING & PRODUCT DIAGRAMS . . . . . . . . . . . . . . . . . 12
T
EMPLATE FOR INTERIOR UNIT . . . . . . . . . . . . . . . . . 16
MOUNTING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . 17
L-2283 ENGLISH
Radome Environmental Control Un it INTRODUCTION
INTRODUCTION
Congratulations on the purchase of your Radome Environmental Control Unit (ECU) air conditioning system. The Radome
ECU is a self-contained direct-expansion air conditioner designed for custom applications and features:
• High-efficiency rotary compressor
• Raised lance fin evaporator coil
• Pre-charged and pre-wired systems for easy connections
• ChargeGuard® ensured environmental protection and system integrity
The Passport I/O Compact microprocessor-based digital control included with this unit offers the most technologically advance
design and is specifically made for the unique requirements of the Radome ECU system. The control features:
• Non-volatile memory
• Low voltage display panel
• Faceplate air sensor for accurate temperatu re co ntrol
• LED temperature displayed in Fahrenheit or Celsius
• Compressor pressure protection
THIS MANUAL
This manual is intended to provide the information necessary to ensure proper installation, operation, and maintenance of the
unit. Improper installation or misunderstood operating procedures can result in unsatisfactory performance and/or premature
failure of the unit. Before proceeding, read this manual completely.
The Radome ECU is covered under the warranty policy contained in this manual. In the interest of product improvement,
specifications and designs herein are subject to change without prior notice.
UNPACKING AND INSPECTION
When you receive the equipment, carefully check all items against the packing list to ensure all cartons were received. Move
units in the normal “up” orientation as indicated by the arrows on each carton. Examine cartons for shipping damage, removing
the units from the cartons if necessary. If the unit is damaged, the carrier should make the proper notation on the delivery receipt
acknowledging the damage.
HOW IT WORKS
The Radome ECU consists of four main components and a refrigerant gas circulating through the system. The blower draws
warm interior air across the fins of the evaporator where the heat from the air is transferred to the refrigerant in the evaporator
coil. As the refrigerant absorbs heat from the warm air, it evaporates from a liquid into a gas. The compressor then compresses
the refrigerant gas and pumps it through the outer tube in the condenser coil. The heat from the refrigerant is exchanged to the
condenser and discharged out of the dome. The liquid refrigerant is then passed through the evaporator coil and the cycle
repeats.
Through this heat-transfer process, heat is removed from the interior dome and its temperature decreases. The cooled air blows
into the dome out of the supply-air grille which is mounted on the unit.
If heating is needed in the dome instead of cooling, the electric heater option must be installed and the system programmed
accordingly (see “Heat Mode” on page 5).
SAFETY CONSIDERATIONS
Installation and servicing of this system can be hazardous due to system pressure and electrical components. When working on
this equipment:
• Always observe precautions described in the literature and on tags and labels attached to the unit.
• Follow all safety codes.
• Wear safety glasses and work gloves and place a fire extinguisher close to the work area.
L-2283 ENGLISH 1
INTRODUCTION Radome Environmental Control Unit
WARNINGS AND NOTICES
WARNING
This manual contains essential safety information concerning the safe and proper installation, operation, and
maintenance of your Radome ECU. It is very important that you read and understand the contents of this manual
thoroughly before installing or using the equipment. You should keep this manual on your boat for future reference.
Failure to follow Dometic approved installation, start-up, operation, and troubleshooting procedures will void the
warranty. If there are any statements in this manual that you do not understand, contact your local dealer for
assistance or the Dometic Marine Service Department:
• Phone: +1 804-746-1313 or +1 954-973-2477 (8AM - 5PM US Eastern Time)
• Fax: +1 804-746-7248 or +1 954-979-4414
• Email: sales@dometic.com
DANGER
ELECTRICAL SHOCK HAZARD. DISCONNECT VOLTAGE AT MAIN PANEL OR POWER SOURCE BEFORE OPENING
ANY COVER. FAILURE TO COMPLY MAY RESULT IN INJURY OR DEATH.
DANGER
The equipment referenced in this manual operates with compressed refrigerant at high pressures. Proper care must
be taken during installation, operation, and servicing to prevent injury or loss of life due to improper procedures.
DANGER
This equipment is not ignition protected per CFR 183.410 and may not be installed in areas that may be exposed to
flammable gases. Do not install in spaces containing gasoline engines, tanks, LPG/CPG cylinders, regulators, valves
or fuel line fittings. Failure to comply may result in injury or death.
WARNING
T o minimize the hazard of electrical shock and personal injury , this component must be effectively grounded. Refer to
the installation gu ide li n es for further information.
NOTICE
Some equipment may be shipped with specific installation sheets or wiring diagrams that may supersede the
information located in this manual. Dometic reserves the right to update or change any information located herein at
any time and without prior notice.
NOTICE
Contains R-417A fluorinated greenhouse gas in hermetically sealed equipment. Refer to the conden sing unit's product
data plate label for quantity of refrigerant shown in weight, global warming potential (GWP), and equivalent tonnes of
CO2 (tCO2e). Any refrigerant added should be noted on unit label.
2 L-2283 ENGLISH
Radome Environmental Control Un it INSTALLATION PROCEDURES
INSTALLATION PROCEDURES
This section covers the installation procedures for internal and external Radome ECU systems. Read the manual completely
before attempting to install any equipment.
INTERNAL UNITS
1. If you are installing an internal Radome ECU, select a location in the dome that will not interfere with the antenna.
2. Internal units must be accessible and have a clear area below the dome for condenser openings. There must be
adequate space for air flow underneath the dome pedestal.
3. Use cutout template (see “Template For Interior Unit” on page 16) to mark and then cut openings in dome floor. Drill
holes for mounting as per template.
4. Ensure that intake and discharge condenser air streams are separated with a divider so that air does not short-cycle
from exhaust to intake.
5. Position the Radome ECU over openings and fasten unit using hardware provided. Ensure foam seals are tight
between ECU and mounting surface and there are no leaks from outside.
6. Make electrical connections as described in “Electrical” below.
7. Use a diverter to position cool-air discharge away from the antenna.
EXTERNAL UNITS
1. If you are installing an external Radome ECU, select a location near the dome to keep evaporator ducting as short and
straight as possible. Ensure that condenser openings can be clear from obstacles.
2. Mount unit to deck using hardware provided.
3. Install evaporator return and supply ducting to dome. Ensure that ducting is taught, secure, and as straight as possible
to minimize bends. Use insulated ducting to reduce heat gain to dome.
4. Make electrical connections as described in “Electrical” below.
5. Position the Passport I/O Compact digital display inside the dome in a location that will sense dome temperature. To
avoid short-cycling, do not place near the supply-air stream into dome .
6. Use a diverter to position cool-air discharge away from the antenna.
ELECTRICAL
1. T urn off the A/C’ s power-supply circuit breaker before opening electric box. Each A/C unit requires its own
dedicated circuit breaker. Use the correct size circuit breaker to protect the system as specified on the Radome ECU’s
data plate label.
2. Remove the electric box panel to access the circuit board and the terminal strip mounted on it.
3. The terminal strip is labeled for proper connections of the electrical supply and ground wires (see “Wiring & Product
Diagrams” on page 12). Make these connections. All connections shall be made with solderless terminals.
THE DIGITAL CONTROL
The Passport I/O Compact is a digital control that displays current temperature and operating mode, and is also used for making
programming changes that affect system operation.
The control has nonvolatile memory requiring no batteries or backup power. When power is lost, the operating parameters are
retained indefinitely. When power is restored, the control resumes operation as last programmed.
See Figure 1 and Table 1 on page 4 to identify all parts of the control.
INDICATORS AND BUTTONS
COOL MODE INDICATOR
Lights when the compressor is running in Cool Mode or in Automatic Mode while cooling. Automatic Mode is only used if
optional electric heat is installed.
L-2283 ENGLISH 3
THE DIGITAL CONTROL Radome Environmental Control Unit
123
4
5
67
8
9
FAN INDICATOR
Lights when the fan is running.
HEAT MODE INDICATOR
Lights when the electric heater is running or in Automatic Mode while heating. Automatic Mode is only used if optional electric
heat is installed.
DIGITAL DISPLAY
Shows current temperature and is also used to view and set program parameters.
SET POINT
Press the Up or Down button to set the desired room temperature. To view the set point, momentarily press and release the Up
or Down button. The Radome ECU set point is 85°F.
AIR SENSOR
Dome temperature is detected by the air sensor on the face plate.
FAN BUTTON
Not used on Radome ECU.
POWER
Press the Power button once to engage the system. The display is blank when the system is off and indicates current room
temperature when the system is on.
Figure 1: Passport I/O Compact Display Panel and Indicators
Table 1: Passport I/O Display - Diagram Legend
1
Cool Mode indicator
2
Fan indicator
3
4 L-2283 ENGLISH
Heat Mode indicator (only with electric heat option)
4
Digital display
5
Up button - Raise temperature set point
6
7
8
9
Temperature sensor
Down button - Lower temperature set point
Fan button (Not used on Radome ECU)
Power button
Radome Environmental Control Un it THE DIGITAL CONTROL
MODES OF OPERATION
OFF MODE
When the control is in Off Mode, all control outputs are turned off. Program parameters and user settings are saved in
nonvolatile memory. The Program Mode can only be accessed from the Off Mode.
ON MODE
When the control is in On Mode, power is supplied to the appropriate outputs and the display indicates the current state of
operation. The operating and program parameters resume b ased on those last stored when the unit was operating.
COOL MODE
When Cool Mode is selected, the Cool LED is lit and the cooling system operates as required.
HEAT MODE
Not used on Radome ECU unless electric heater option is installed. See Programming Parameter “P-15: Reverse-Cycle or
Electric Heat” on page 8 for more information.
AUTOMATIC MODE
Automatic Mode is only available if the electric heat option is installed. When Automatic Mode is selected, the system provides
both heating and cooling as required. The Heat LED or Cool LED lights indicate the mode in use. Dome temperature in a given
mode is maintained within 2°F (1.1°C) of set point. If the system was most recently cooling, the dome temperature must drop
below the set point by at least 4°F (2.2°C) in order for the system to switch from cooling to heating. Similarly, if the system was
most recently heating, the dome temperature must exceed the set point by at least 4°F (2.2°C) in order for the system to switch
from heating to cooling. This behavior prevents small temperature overshoots from causing the system to switch between
heating and cooling when it is not necessary. To make the temperature differential between cooling and heating larger, see See
“P-23: Auto Mode Heat Differential” on page 9.
MOISTURE MODE
Not used on Radome ECU.
FAN MODES
Automatic Fan Mode
Not used on Radome ECU.
Manual Fan Mode
Not used on Radome ECU.
Fan-Only Mode
Not used on Radome ECU.
Cycled or Continuous Fan Operation
The fan can be set to run continuously whenever the system is turned on, or it can be set to cycle on and off with the
compressor. When “con” is selected, the setting is continuous fan operation. The default setting for the Radome ECU is “con”.
The cycled setting (“CYC”) is not used on Radome ECU.
PROGRAM MODE
Use Program Mode to adjust operating parameters for your particular needs. Program Mode is also used to fine-tune the
system for the most efficient operation within an installation. (Variables such as ducting, sensor location, and system layout
affect system operation.) The control has factory default settings stored in permanent memory that can be recalled. However,
reprogrammed settings can be saved as the new default, thus overwriting the factory defaults. See “P-17: Reset Memorized
Defaults” on page 8 for details.
NOTE
All program parameter settings are factory configured for normal Radome ECU operation and should only be modified
by qualified service personnel.
L-2283 ENGLISH 5
THE DIGITAL CONTROL Radome Environmental Control Unit
Important Programming Notes To Installer and End User
1. When powering on the control, press and immediately release the Power button so you do not unintentionally enter
Program Mode. You will enter Program Mode if the Power button is pressed and held for more than 5 seconds. If you
enter Program Mode unintentionally, any subsequent presses of the Up or Down buttons will change the P-1
parameter setting since it is the first parameter shown after entering this mode. This will change the operating mode to
Cool Only, Heat Only, or Automatic, which could result in improper system operation. Always use care when in
Program Mode. For further information, refer to “Using Program Mode” on page 6.
2. The Radome ECU is a Cool Only system (it does not have a reversing valve), therefore you must make sure the Cool
Only Mode value “1” is set for parameter P-1 (this is the factory default for Radome ECU systems). DO NOT program
Automatic Mode for a Cool Only unit. If Automatic Mode is selected and the thermostat calls for heat, the compressor
will run. Since there is no reversing valve, the air conditioning unit will supply cool air when heating is desired. Cool
Only units do not heat.
However, if you have the electric heat option installed you CAN program Automatic Mode, which will allow the unit to
switch between cooling and heating as needed based on independent high and low set points. See “Automatic Mode”
on page 5 for details.
See “P-1: Operating Mode” on page 7 for more information on how to set the proper operating mode.
See “P-15: Reverse-Cycle or Electric Heat” on page 8 for more information on how to set the electric heat option.
3. You can restore the last memorized default settings by entering Program Mode and setting P-17 to “rSt”.
Using Program Mode
Entering Program Mode
You can only enter Program Mode from the Off Mode. If necessary, press the Power button to enter Off Mode. Press and hold
the Power button while in the Off Mode until the letter “P” appears in the display. The characters “P1” followed by the P-1
parameter setting appear in the display. The control is now in th e Prog ra m Mo de . If no programming is attempted for one
minute, the control exits Program Mode and returns to Off Mode.
Exiting Program Mode
Press the Power button once to exit Program Mode and return to Off Mode. Or, do not attempt any programming for 50
seconds, then the control exits Program Mode and returns to Off Mode. Any programming changes made while in Program
Mode will be saved and put into operation after exiting Program Mode and returning the control to the On Mode. (If you want the
programming changes to become the new defaults, see “Memorizing New Program Parameters” on page 6.) When you exit
Program Mode the software version number (such as “A24”) appears in the display.
Changing Parameters
While in Program Mode, press and release the Fan button to increment from one program parameter to the next until you reach
the desired parameter number. The programmable parameters range from P-1 through P-22.
When you reach the desired parameter number, use the Up and Down buttons to select the data or set the desired limits for the
parameter being programmed. See Table 2 on page 9 for a list of the parameters, the possible settings for each, and their
factory default settings for the Radome ECU.
Memorizing New Program Parameters
If you want new parameters to be the program defaults, adjust the parameters to the desired settings, then press the Up and
Down buttons simultaneously while in Program Mode. This memorizes the new settings as program defaults and exits the
Programming Mode.
To return to the factory default settings, refer to the factory defaults listed in Table2 on page 9 and reset the parameters
manually.
Restoring Memorized Default Settings
Y ou can restore the last memorized default settings by entering Program Mode and setting P-17 to “rSt”. The memorized default
settings are restored and the control returns to Off Mode. See “P-17: Reset Memorized Defaults” on page 8 for details. T o return
to the factory default settings, refer to the factory defaults listed in Table 2 on page 9 and reset the parameters manually.
Software Identification
The control’s software version (such as “A24”) appears in the display for one second prior to exit from Program Mode, then the
control returns to Off Mode.
6 L-2283 ENGLISH
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