Passport I/O Control Operations Manual Read This Manual Before Proceeding
L-2231 ENGLISH 1
INTRODUCTION
The Passport I/O is a microcontroller-based unit designed for use with direct expansion, reverse-cycle air conditioning systems.
READ THIS MANUAL BEFORE PROCEEDING
Read this manual completely before you proceed with the installation and operation of the Passport I/O. If you have questions or
require assistance with your Passport I/O, call your dealer or the Dometic Marine Service Department at +1 954-973-2477.
The Passport I/O is covered under the Owner’s Limited Warranty Policy. Incorrect installation, neglect and system abuse are not
covered under the Owner’s Limited Warranty Policy.
FEATURES
STANDARD
OPTIONAL
• Outside air-temperature sensor.
• Alternate air-temperature sensor.
• Pump Sentry water sensor.
• Electric heating control capabilities.
• Air Filter Cleaning or Replacement Timer (available in software revision A21 or newer).
• Low-Voltage Monitor (available in software revision A21 or newer).
This manual provides all necessary information for proper installation and operation of the Passport I/O. Poor installation or
misunderstood operating parameters will result in unsatisfactory performance and possible failure.
DESCRIPTION OF CONTROL
See Figure 1 and Table 1 on page 2 to identify all parts of the control.
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.
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.
FAN
Fan-speed operation is automatic, allowing fan speed to decrease as set-point temperature is approached in the Cool Mode.
The fan operates at low speed when set point is satisfied.
Normally the automatic fan speed operation is reversed in the Heating Mode, however, you can program the fan to operate the
same as in the Cooling Mode.
Press the Fan button to select manual fan speeds if you want to override automatic operation. You can program the fan to run
only during a cool or heat cycle, otherwise the fan runs constantly.
MEMORY
The Passport I/O 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 operating as last programmed.
• Universal 115/230 volt, 50/60 Hz AC power supply.
• User-friendly four-button display panel.
• 5V microcontroller located in the display.
• Option to display temperature in degrees F or C.
• Ambient air sensor in face plate.
• Programmable fail-safe modes.
• Programmable parameters.
• Nonvolatile memory requires no backup power.
• Switch inputs for High/Low Refrigerant pressure.
• Humidity Mode control.
• De-icing cycle prevents evaporator icing.
• Programmable fan operation.
• Programmable compressor delays.
• Programmable display brightness.
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