Installation Guidelines for Passport I/O Evironmental Control Unit

Each Passprt I/O Environmental Control Unit comprises a display panel, display cable, and a control circuit board assembled into the air conditioning unit's electrical box. Determine the proper location of all components before proceeding with the installation.

Locate and secure the air condidtioning unit in a dry, accessible area with the fasteners provided. Secure remote electrical boxes containing the Passport I/O circuit board with the fittings provided. The central system condensing unit's electrical box can remain factory-installed on top of the unit. Some electrical boxes contain position-sensitve components and require correct mount positioning.

Allow adequate access for all wiring connections. Wiring and circuit breakers must be sized according to marine design standars. Only stranded tinned copper wire should be used. Make sure all components are properly grounded.

Determine the proper location for the display panel in the cabin area(see installation manual) and cut out the bulkhead for mounting (3.375" W x 2.875" H). Properly route and secure the display cable between the control circuit board and the display panel.

Note: In central system applications, the display cable could be routed with the refrigerant line set from the condensing unit to the evaporator / blower assembly. Leave a few inches of extra cable at each end for ease of installing or removing components.

Do not stretch or pull a cable. Do not use staples to secure any cable. Plug the display cable into the Passport I/O circuit board (8-pin connector).

Attach the other end of the display cable to the display panel. Secure the panel to the bulkhead with the adhesive strips attached , or use the optional bulkhead adapter.

The alternate inside air sensor, when used, must be plugged into the 6-pin socket on the circuit board marked "J4" (ALT AIR). It must be located and installed properly in the return air stream. Using the alternate air sensor will disable the face plate air sensor on the display. When used as an outside air temperatures sensor, it must be plugged into socket "J3" (OAT), routed and secured properly to a pre-determined location outside the cabin areas. The sensor should not be located in direct sunlight.

Access to the control board is achieved by removing the screws on the electrical box. Slide the front piece containing the components away from the mouting base. Turning this piece over to any side will expose the circuit board and electrical components. A complete wiring siagram is secured to the inside of the mounting base and/or in the operations manual for reference. Be sure that the power is off before opening the electrical box