Embraer EMB145 Operation Manual page 2076

PNEUMATICS
AIRPLANE
AIR CONDITIONING
OPERATIONS
AND PRESSURIZATION
MANUAL
AIR CONDITIONING SYSTEM
Airplane air conditioning is provided by two Environmental Control
Units (ECU) supplied by the Pneumatic System.
Each side is provided with independent controls, protection devices,
and cross-connected air distribution lines for the various modes of
operation.
Cockpit and passenger cabin temperature selections are independent
and may be controlled either manually or automatically. The left ECU
controls the temperature in the cockpit and the right ECU controls the
temperature passenger cabin.
The system is normally operated in the automatic mode. In case of
automatic mode failure, a manual mode is available.
The pilots may transfer the passenger cabin temperature control to the
Attendant Panel.
The air conditioning distribution is performed by the gasper system
and general outlets with cross-connection between the cockpit and
passenger cabin lines.
This feature, associated with the ram air inlets, allows the cockpit and
passenger cabin to be supplied with fresh air, in case of failure of both
ECUs.
Recirculating air, driven by two electrical fans, is mixed to fresh air in
order to improve passenger and crewmembers' comfort.
A ground cart connection is available at the right-hand duct, connected
to the outside through a check valve in the fuselage. The pre-
conditioned air from the ground cart is delivered to the cabin directly
through the distribution lines.
The air conditioning system incorporates protection features in the
temperature controllers which shut off the system in case of
malfunctions (duct leakage, duct overtemperature, and pack
overtemperature).
The cockpit and passenger cabin temperature indications are
presented on the MFD. Caution and advisory messages are presented
on the EICAS.
Page Code
2-14-10 1 01
REVISION 38