TBM
700
SUPPLEMENT 15
“KEITH” VAPOR CYCLE COOLING SYSTEM
Page 9.15.4
Edition 1 -- November 30, 2010
Rev. 0
SECTION 7
DESCRIPTION
The ”KEITH” vapor cycle cooling system improves the passengers and crew
comfort in warm and / or humid atmospheric conditions. The refrigerant used
is called R134A.
The installation (Figure 9.15.1) comprises :
-- A compressor/condenser assembly located in the fuselage rear section
between frames C 17 and C 18 and consisting of :
. a compressor,
. a condenser heat exchanger,
. an electric motor driving the condenser impeller fan and the compressor
through pulley and belt,
. a receiver drier with a built--in overpressure relief valve rated to open at
425 psi (29 bars),
. a binary pressure switch monitoring low and high pressures
[30
≤
P
≤
300 psi (2
≤
P
≤
20 bars)],
. a relay.
The components are installed on a pallet and enclosed in a housing
connected through flexible ducts to a screened air inlet and outlet located
symmetrically on the rear fuselage lower section skin above the ventral
fins.
The electric motor is supplied by the BUS 4 bar through the power relay
and controlled by the ”AIR COND” switch.
-- An evaporator heat exchanger, made of copper tube and pure aluminium
fins, features a foam filter on its air intake face.
TBM700A
The evaporator is installed on the frame C 13 on L.H. side and is open to
cabin air through a lattice orifice above the floor.
TBM700B
The evaporator is installed between frames C 16 and C 17 on L.H. side on
rear baggage compartment floor.