RJ150-30 / Operations and Maintenance Manual
Mobile Aircraft Air Conditioner
Trailer Mounted, Cool Mode Only
______________________________________________________________________________
SECTION 1 - 1
JANUARY 20, 2004
PAGE 16
J. Canopy Lighting:
The upper canopy includes an operational beacon (DS1; AMBER). Clearance
lights (CL1-4; RED and/or AMBER) are mounted on each of the upper canopy
corners. All canopy lighting require the genset to be operating and are
powered by 24 VDC battery power.
3. AIR CONDITIONING SYSTEM DESCRIPTION:
The Model RJ150 uses a standard vapor cycle refrigeration system (See Figure
6), dual hermetic scroll compressors, and refrigerant (R22, R134a, or R407c)
based on user specifications. (Refer to Section 1-3, Specifications) The unit is
designed to maintain the cabin temperature on a regional jet-sized fixed or
rotary-wing aircraft between 65
°
and 75
°
F (18.3
°
C and 23.8
°
C).
A. Refrigeration System Components:
This system has a single stage of cooling. The cooling refrigerant is
continuously circulated by the pressure differential created by the compressor
set and is controlled by the expansion valve. The ambient air temperature
setpoint is factory set to 50
°
F (10
°
C). The ambient air temperature sensor
(RTD2) continuously signals the Cooling Temperature Control Module
(ETC2). When ambient conditions and safety interlocks are met, the Cooling
Temperature Control Module (ETC2) enables refrigeration system functions.
(1) Compressor:
The Model RJ150-30 uses dual 7.5-ton compressors (M2, M4) with a total
system rated cooling capacity of 15-tons (approximately 180,000 BTU/hr).
The compressors are located aft of the genset. (See Figure 1) The
compressor set is designed to increase refrigerant pressure to a level
where the refrigerant can be cooled and condensed to a liquid state by
ambient air being drawn over the condenser coil. The compressors'
integral motors are electrically driven by the genset.
(2) Condenser Coil:
The compressed refrigerant gas from the compressor set is forced into the
condenser coil where the high-pressure, high-temperature refrigerant gas
is condensed into a high-pressure liquid. The condenser fan (M3) draws
ambient air over the condenser coil to extract the latent heat of
vaporization at the higher pressure from the refrigerant, causing
condensation. (See Figure 9)
