CSR-20 & CSR-40, September 1999
General Description
Model CSR-20SL, CSR-40 and CSR-40SL units are all-elec-
tric, single-piece, refrigeration units with bottom air supply.
Each unit is designed to cool and heat containers for shipboard
or overland transit. Each unit mounts in the front wall of the
container. CSR-20SL and CSR-40SL units feature a slimline
frame (see “Physical Specifications” on page 1-9). Fork lift
pockets are provided for installation and removal of the unit.
The frame and bulkhead panels are constructed of alu-
minum and are treated to resist corrosion. A hinged, remov-
able evaporator compartment door provides easy service
access. All operating components except the evaporator coil
can be replaced from the front of the unit. A totally sealed,
hermetic refrigeration system minimizes maintenance and ser-
vice.
Each unit is equipped with an 18.3 m (60 ft) power cable
for operation on 460-380V/3 Ph/60-50 Hz power. For opera-
tion on 460-380V/3 Ph/60-50 Hz power, plug the 460-380V
power cable into the proper power supply. The unit power
cable is stored below the control box in the condenser section.
Each unit is equipped with 460-380V/3 Ph/60-50 Hz elec-
tric motors. An automatic phase correction system provides
the proper electrical phase sequence for compressor, condenser
fan and evaporator fan motor operation.
Unit features include a hermetic scroll compressor with a
liquid injection system; 2-speed evaporator fans; a fresh air
exchange system; and a Thermoguard
®
µ
P-D microprocessor
controller with indicator LEDs. The
µ
P-D controller controls,
monitors and records unit operation using supply air, return air,
evaporator coil, condenser coil, ambient and compressor dis-
charge temperature sensors. For additional unit feature informa-
tion, see “CSR Model Features” on pages vi and vii of the
Introduction.
Hermetic Scroll Compressor with Liquid Injection
Cooling System
The refrigeration unit includes a hermetic scroll compressor
(one stationary and one orbiting member) with ambient com-
pensated internal overload and high temperature protectors,
and a refrigerant injection system.
Dual Speed Evaporator Fans
CSR models are equipped with either 2 or 3 evaporator fans.
All models feature 2-speed motors. The evaporator fans operate
continuously to circulate air inside the container. The fans oper-
ate on high speed for perishable cargo at return air temperatures
of -9.9 C (14.1 F) and above. At return air temperatures of -10 C
(14 F) and below, the evaporator fans operate on low speed for
frozen cargo.
NOTE: If Economy Mode is ON:
• Fresh Loads: Evaporator fans operate on low
speed when container temperature is in-range.
• Frozen Loads: Evaporator fans stop during the
Null mode; controller operates fans on low speed
for 5 minutes every 45 minutes.
Fresh Air Exchange System
The fresh air exchange system removes harmful gases from
containers carrying sensitive perishable commodities. The
fresh air vent is located above the control box. The fresh air
vent is adjustable to accommodate a variety of cargo and
chilled load operating conditions. The fresh air vent should be
tightly closed when carrying frozen cargo.
2
Unit Description
