Carrier 50CO Series Installation, Operation And Maintenance Instructions page 20

11 - TECHNICAL SPECIFICATIONS
This accessory should not be installed in corrosive environments (saline environments) or explosive environments (ATEX area).
Composition: This is a mixing box made up of two dampers. (one fresh air side and the other on the room's return air side).
Two combined temperature and humidity sensors are also provided at the back of the unit. (One outdoor sensor and one internal room
sensor).
Internal room sensor
The outdoor sensor should be installed in a well ventilated area that is not exposed to direct sunlight.
Connection: The plenum is mounted above the unit. A diagram provided with the plenum explains the mounting system. Do not forget
to stick the adhesive gasket provided to the edge of the plenum frame that will be in contact with the unit to ensure its tightness.
Electrical connection: When this option is chosen, a wound wiring loom can be found ready at the top of the unit.
Connect this bundle to the junction box as shown on the diagram. For sensors, the cross section of cables must be a maximum of 1.5
mm². If possible, pass the cables through the top section of the plenum using the grommet provided for this purpose and refer to the
routing recommendations in "the Connections" section.
See wiring diagram for connection.
Operation:
A filter must be installed upstream on the fresh air side (type F7, not provided by CIAT and at customer's expense)
so that the indoor air is not adversely affected.
The option allows cooling to be carried out using outdoor air (fresh air), in accordance with the temperature and humidity conditions,
to decrease the room temperature. The opening and closing of dampers is managed by the controller according to the information
relayed by the various sensors required for correct operation.
Thanks to these control elements, the controller manages the unit's operating mode.
The cooling contribution to reach the temperature setpoint is then carried out:
- Using fresh air only (outdoor air)
- Fresh air + heat exchange coil.
- Heat exchange coil
11.2.7 - Intake damper on the unit:
This is mainly used to insulate the unit when it is connected to a duct system.
The damper prevents air returning to the unit when it is not operating and when other units are operating nearby.
This option is mounted and connected in the factory. Please see the dimensional drawing and connection diagram for the dimensions
and mounting holes for any potential ducts.
The damper is controlled by the controller, which is fitted with a servomotor with a reset function.
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Outdoor room sensor