Diamond DA 42 NG, Maintenance Manual

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AIRCRAFT
DA 42 NG AMM Heating and Ventilation
Doc # 7.02.15
Rev. 4
21-50-00
Page 1
15 Mar 2018
Section 21-50
Cooling (OÄM 42-193/c or earlier installed)
1. General
If OÄM 42-193/c or earlier is installed, a recirculating air - cabin cooling (RACC) system is installed.
The RACC system is an independent subsystem of the airplane and is electrically powered. It consists
of the central unit (installed aft of baggage compartment) and a control panel (in the cabin, LH
sidewall).
2. Description
A. Central Unit
The central unit operates with a refrigerant R134a vapor cycle cooling circuit. The system requires
electrical power (28 V DC, max. 65 A) for operation, which is provided by an additional alternator.
The central unit is subdivided into the following components:
)
Compressor assembly (part of refrigerant circuit).
)
Condenser assembly (part of refrigerant circuit).
)
Evaporator assembly (part of refrigerant circuit).
)
Condenser fan.
)
Evaporator radial fan.
)
Cabin radial fan.
)
Electrical control system.
Refer to Figure 1 for a system schematic of the RACC system.
Note: The refrigerant vapor cooling system is a hermetically sealed and
pressurized circuit and contains the refrigerant R134a.
WARNING: ALL MAINTENANCE AND REPLENISHMENT WHICH REQUIRES TO
OPEN AND DEPRESSURIZE THE REFRIGERANT CIRCUIT MUST BE
CARRIED OUT BY AUTHORIZED PERSONNEL ACCORDING TO
NATIONAL AND INTERNATIONAL REGULATIONS FOR REFRIGERANT
SYSTEMS.