Pilot's Operating Handbook
Section 7
Description
Edition 1 - January 15, 2018
Rev. 5
Page 7.9.6
Dual-zone Environmental Control System (ECS)
The ECS controls both the cockpit and cabin heating and cooling functions.
The ECS consists of two independent air circuits :
-
Heating circuit, controlled by the Temperature Conditioning System (TCS)
-
Cooling circuit, controlled by the Vapor Cycle Cooling System (VCCS)
Heating circuit
The TCS regulates hot air coming from the bleed air system (also used for
pressurization) and mixes it with the recirculating cabin air at the Mixing Ejector
(MIXEJ) to lower the delivered air temperature.
The resultant air flow enters the Hot Air Distributor (HAD) and is distributed in the
cockpit / cabin zones depending on the demand.
The air is distributed :
-
into the cockpit zone through :
.
ports located on pedestal sides,
.
ports under each seat or
.
the demisting outlets.
-
into the cabin zone through :
.
ports located on the lower section of the left-side and right-side cabin
upholstery.
Cooling circuit
The VCCS is selected on only when the GASC receives a cooling command. It is
composed of two independent circuits :
-
one for the cockpit zone
-
one for the cabin zone
For each circuit, the intake of air is by means of a variable speed electrical fan, with the
air blown through an evaporator and ducted to the different zones :
-
into the cockpit by passing through :
.
the upper panel equipped with swiveling and adjustable air outlets,
.
air outlets located on armrests of pilot and front passenger stations and
.
ports located under instrument panel.
PIM - DO NOT USE FOR FLIGHT OPERATIONS
