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8
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62-11389
Change 09/11
10.Separate the radiator (4) from the condenser/radiat-
or assembly by removing the top and bottom radiator
mounting brackets (9). Set radiator aside.
11. Remove condenser coil by removing the condenser
coil mounting brackets (10).
12.Reassemble condenser/radiator assembly in re-
verse order using new coil.
CAUTION
Do not bend the copper tubing on the con-
denser coil when installing the new con-
denser. Bend the unit tubing if tubes do not
align correctly.
Note
Before applying heat to the new condenser ap-
ply a wet rag to the entire copper to aluminum
transition area to avoid melting the protective
heat shrink or damaging the joint.
13. Reassemble condenser/radiator assembly into
unit.
14. Leak check, evacuate and charge the system. Re-
fer to Sections 8.6.3, 8.6.4 & 8.6.2.
15. Refill engine coolant. Refer to Section 8.5.12.
8.8.3 Filter-Drier
a. Check Filter-Drier
The unit must be running in cool for this test. check for a
restricted or plugged filter-drier by feeling the liquid line
inlet and outlet connections of the drier cartridge. if the
outlet side feels cooler than the inlet side, then the
filter-drier should be replaced.
b. Replace Filter-Drier
1. Pump down the low side, refer to Section 8.6.2.
2. Remove bracket, loosen the inlet connection to re-
lieve any remaining pressure then remove drier.
3. Procure new O-rings. Lubricate the O-rings, back
side of sleeves and coupling nuts. Using a backup
wrench at each connection torque 30 to 38 ft-lbs (41
to 51 Nm).
4. Leak check and evacuate the low side of the system.
Refer to Sections 8.6.3 & 8.6.4.
8.8.4 Replacing Receiver Sight Glass Or Fusible
Plug
a. Remove the refrigerant charge. Refer to Section
8.6.2.
b. Loosen the sight glass or fusible plug to relieve any
remaining pressure. Remove and discard glass or
plug.
c. Wrap threads of new sight glass or plug with Teflon
tape or spread sealing compound on pipe threads
and install. Torque the sight glass to 15 to 25 ft lbs (20
to 34 Nm). Torque the fusible plug to 4 to 8 ft lbs (5 to
11 Nm).
d. Leak check, evacuate and charge the system. Refer
to Sections 8.6.3, 8.6.4 & 8.6.2.
8.8.5 Compressor Suction Modulation Valve
(CSMV)
The purpose of the SMV is to maintain the compressor
within its operating envelope and maximize unit
capacity and fuel economy.
At initial startup, the microprocessor will go through a
self test. When the test is complete, the MessageCenter
will display “SMV CLOSING”. Then the MessageCenter
will display “SETTING SMV XX%” with actual
percentage depending on ambient temperature and
refrigerated compartment temperature. The unit will
then go through its normal start procedure.
2-1/8 INCH NUT
4 PIN CONNECTOR
STEPPER
MOTOR
VALVE
Figure 8
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26 Suction modulation valve (CSMV)
If it is suspected that the SMV is malfunctioning, the
most efficient method of diagnosing the valve is to run a
Pretrip (refer to Section 3.4). The Pretrip steps will
check the remainder of the system and the #11 test will
check the SMV. The valve will be brought to a preset
position, the unit started and then the valve will be
opened while the microprocessor monitors suction
pressure. If there is a problem with the valve, stepper
motor or microprocessor wiring to the valve the test will
fail.
a. Diagnostics - Microprocessor or Wiring
1. Locate the wires, on the engine harness side of the
SMV connector labeled CSMVA, CSMVB, CSMVC
and CSMVD. These will correlate to the connector
pins labeled A, B, C and D. Refer to Table 8
−
3.
Table 8
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3 CSMV Connections
Connector Pin
Wire Color
Winding/Pole
A
BLACK
1A
B
WHITE
1B
C
RED
2B
D
GREEN
2A
2. Power the microprocessor by toggling the Main
Power switch out of the OFF position DO NOT AL-
LOW THE UNIT TO START. When the Message-
Center displays “SMV CLOSING”, measure the AC
voltage between pins A & B and then between C & D.
A voltage (10 to 16 VAC) should be read by the digital
voltmeter for each pair of wires. If the reading is pres-
ent on the wire pairs there is a good signal coming
from the microprocessor.
3. If the reading is not present on one or more of the
wire pairs, check the wiring between the micropro-