Beechcraft Baron G58 Pilot Operating Handbook page 575

Airplane Flight Manual Supplement
Beechcraft Baron Models
G58, 58A, 58, E55A, E55, D55A, AND D55
The A/C Systems LLC Air Conditioning portion of the Automatic Climate Control System operates on a
closed vapor loop concept. The Heating portion operates in the same fashion as the non-climate controlled
aircraft though it is controlled automatically or manually overridden with the Automatic Climate Control
System. The components are designed to be lightweight and to operate in extreme ranges of altitude and
temperature.
ENVIRONMENTAL CONTROL SYSTEM
Automatic Climate Control System - The electronic Automatic Climate Control System is fully automatic
and is designed to maintain the desired temperature inside the aircraft. The temperature and volume of the
air coming from the vents as well as the fan speed (of the air conditioning blower) and air distribution change
automatically.
Electric fan, forced air, directed through the condenser coil, located in the empennage, cools the hot, high
pressure A/C Systems LLC refrigerant. The condenser intake air is taken from two louvered ducts on the
left-hand side of the aircraft, under the horizontal stabilizer. Condenser exhaust air exits through a louver
located on the right-hand side of the empennage.
The Air Conditioning System performs the following functions:
1. Cools cabin air temperature.
2. Establishes the humidity level of the cabin at a comfortable level.
3. Helps prevent fogging of windows.
4. Reduces dust and pollen particles from the cabin air.
Control of the refrigeration temperature cycle is done with an electronic controlled thermostatic cycling
switch. The switch senses evaporator temperature and cycles the engine driven compressor to regulate the
evaporator coil temperature and to prevent the coil from "freezing up".
During operation during warm cabin temperatures the Automatic Climate Control System operates in the air
conditioning mode, supplying cooled, dehumidified air to the ceiling console vents and the flood ducts above
the rear seats. When the system switches to "heating" operation during cool cabin temperatures, heated,
outside air will be delivered to the front and rear floor vents and the windshield based on temperature
conditions and the mode of operation settings.
All outside air vents must be closed for maximum cooling.
In the rare occurrence of a refrigeration "overpressure" condition, a high/low pressure Trinary safety switch,
located on the receiver/dryer, will disengage the compressor to allow pressures to return to a safe level.
This same switch senses a low pressure condition in the system and disengages the compressor to prevent
damage. The Trinary safety switch automatically resets once refrigerant pressures have returned to a safe
level.
The Automatic Climate Control System can be left on in any mode at the time of aircraft shut-down and will
resume the previously selected temperature and mode when reactivated. The system will be active once
both electrical buses are on and the voltage annunciator lights are extinguished.
For safety purposes the Automatic Climate Control System will deactivate if the bus voltage falls below a
predetermined threshold.
In the event that the Air Conditioning portion of the Automatic Climate Control System does not seem to be
functioning correctly, the Automatic Climate Control System should be switched to the "Air Conditioning
Compressor OFF" mode by pressing the
conditioning performance evaluation should be performed by an authorized Service Center to determine and
correct the problem prior to resuming the use of the air conditioning portion of the Automatic Climate Control
System.
FAA Approved 04/23/2012
SECTION 7 –SYSTEMS DESCRIPTION
NOTE
button until the adjacent indicator light is out.
Document No. FTA-010-6
Revision IR
Page 7
An air