MCC 50-2104 - Coil Replacement

4-13
© 2015 Mobile Climate Control
T-367 Rev. 05/2015
3 Incomplete magnet circuit due to the omission of
the coil housing or plunger.
4 Mechanical interface with movement o f plunger
which may be caused by a deformed enclosing
tube.
Failure to open may be caused by the following:
1 Coil burned out or an open circuit to coil connec
tions.
2 Improper voltage.
3 Defective p lunger or deformed valve body assem
bly.
Failure to close may be caused by the following:
1 Defective p lunger or deformed valve body assem
bly.
2 Foreign material in the valve.
4.11.1 Coil Replacement
a. It is not necessary to remove the refrigerant charge
from the system.
b. Place main battery disconnect switch in OFF posi
tion and lock.
c. Disconnect wire leads to coil.
d. Remove coil retaining screw.
e. Lift coil from en closing tu b e and replace.
f. With the coil installed replace the retaining screw.
g. Connect wire leads and test operation
4.11.2 Internal Part Replacement
a. Perform a low side pump down on system. Refer
to paragraph 4.4.2.
b. Carefully loosen enclosing tube assembly and en
sure no pressure remains within the valve. Disas
semble valve and replace defective parts.
c. Assemble valve and leak check. Refer to paragraph
4.5
d. Evacuate/Dehydrate low side of system. Refer to
paragraph .
e. Op en valves and test operation..
1. Coil retaining screw
2. Coil Assembly
3. Enclosing Tube
Assembly
4. Gasket
5. Body
1
2
3
4
5
Figure 4-10 Liquid Line Solenoid Valve
4.11.3 Replace Entire LLS Valve
a. Perform a low side pump down on system. Refer
to paragraph 4.4.2.
b. Remove coil assembly and enclosing tube as
sembly. Refer to paragraph 4.11.1.
c. Un-braze valve body from piping, while using an
inert gas purge to avoid system contamination
from carbon due to heat and oxidation.
d. Clean tubing to accept n ew valve b ody.
e. Disassemble enclosing tube assembly and com
ponents from new valve. Install new valve body by
brazing body to piping while using inert gas purge
to protect system contamination.
f. Once valve body has cooled, re-install enclosing
tube assembly and components on new valve.
g. Install new filter-drier.
h. Leak check connections. Refer to paragraph 4.5,
excluding th e replacement of filter drier refer
enced in step ( e ).
i. Evacuate/Dehydrate low side of system. Refer to
paragraph 4.6.
j. Replace coil assembly and test operation.