Passport I/O Control Operations Manual Programming
L-2231 ENGLISH 9
evaporator temperature (standard). For more extreme installations, set this parameter to “2” to assume the display
sensor may be reading the room temperature as much as 7°F (3.9°C) greater than the actual evaporator temperature.
The setting of “2” should only be used if a setting of “1” does not prevent evaporator ice from forming.
P-9: Optional Pump Sentry
The control can be equipped with an optional temperature sensor that is used to monitor the condenser coil temperature. The
sensor is plugged into the “SERVICE/H20” sensor jack and parameter P-9 programmed for a temperature between 100 and
150°F (37.8 and 65.6°C), depending on seawater temperature and the system type. (Note that setting increments are in °F even
when the control is set to display °C.) Connect the water sensor to the condenser coil outlet and insulate it. When the coil
temperature rises above the programmed value, the pump and compressor are shut down and “PLF” flashes in the display.
P-10: Display Brightness Control
The display brightness can be adjusted from 4 to 13, with 4 being the dimmest and 13 the brightest. Typically a dark cabin will
require a setting of 4 or 5. A very bright cabin will require a setting of 10 to 13.
P-11: Fahrenheit or Celsius Selection
The default setting is °F. Select °C for Celsius. (Celsius readings are displayed in tenths, for example 22.2°).
P-12: Cycle Pump With Compressor
To increase pump life and conserve electricity the pump can be programmed to cycle on and off with the compressor. The pump
can also be programmed to operate continuously whenever the system is on. To program the pump for continuous operation,
set P-12 to “con”.
P-13: Reverse Automatic Fan Speeds During Heating
The automatic fan speeds can be reversed during Heat Mode to improve heat output in cooler climates. The fan will speed up
as the set point is approached. Lowering the fan speed when the cabin is cold increases head pressure and helps raise supply
temperature. Increasing the fan speed as the set point is approached also reduces unnecessary high pressure faults. The fan
switches to low speed when the set point is satisfied and the heating cycle terminates. The fan can be programmed to operate
the 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 system is on, or allow it to cycle with the compressor. The default is “con”
for continuous fan. To cycle the fan with the compressor, select “CYC”.
P-15: Reverse-Cycle or Electric
Units not equipped with reverse-cycle heat may have an electric heater added. Set to “ELE” for the electric heat option.
• For software revision A12 and older: When this parameter is programmed for electric heat, only the electric-heater
relay located toward the middle of the circuit board is energized during a heating cycle (see “SAMPLE WIRING
DIAGRAMS” on page 19).
• For software revision A13 and newer: When programmed for electric heat, both the electric-heater relay and the
valve relay areis energized. This change supports newer circuit board revisions without the electric-heater relay.
Therefore, circuit boards that do not have electric-heater relays require a display with software revision A13 or newer
to properly energize the valve relay. Also, sSince the valve-relay output only supports a maximum of 15 amps at
115VAC or 10 amps at 230VAC (PPIO circuit boards revision F and newer) of resistive load, when installing an optional
electric heater that exceeds this load, it is necessary to install an additional contactor that is rated to handle the full
load of the electric heater. Please consult with Dometic Customer Service or with an authorized service technician for
assistance.
P-16: Fan Motor Selection
The “SC” (Split Capacitor) default setting is correct for air conditioning units with high-velocity blowers. Only change the setting
to “SP” if your unit has a Shaded Pole fan motor, recognizable by a blower-motor overhang. The SC motor of a high-velocity unit
is inside the blower, and the unit has “VTD” or “HV” in the model number.
P-17: Reset Memorized Defaults
To reset all programming parameters set this parameter to “rSt”. This restores all programmable parameters to the
last saved
default values. Once new values are entered and memorized the factory defaults are overwritten, and the new parameters
become the default values. To restore the original factory default parameters manually, refer to Table 2, page 10.
IMPORTANT
When used with optional electric heat, the fan remains on for four minutes after the heater cycles off even if fan is set
to cycled operation.
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