Filter Drier; Capillary Tube & Drier Assembly - Stoelting F431 Service Manual

E. Identify and disconnect the two wires from the
solenoid coil.
F. Remove the retainer holding the coil to the solenoid
body and remove the coil.
G. Unsweat the solenoid and remove.
SOLENOID VALVE REPLACEMENT
To replace the solenoid, perform the following procedures:
A. Position the new solenoid with the arrow pointing
toward the direction of fl ow.
B. Apply a heat sink (wet cloth) to the solenoid valve.
C. With the suction and discharge ports open, braze
the solenoid into the system using appropriate
brazing material.
D. Remove the heat sink from the valve.
E. Replace insulation around valve.
F. Replace the fi lter drier. Refer to Section 5.8 for
details.
G. Evacuate and recharge system per instructions
in Section 5.2.

5.9 FILTER DRIER

The fi lter drier must be replaced every time the refrigeration
system is opened for service. A new fi lter drier improves
operation of the entire refrigeration system by stopping
the circulation of moisture and by removing harmful con-
taminants (Refer to Figure 5-12).
Figure 5-12 Filter Drier
FILTER DRIER REMOVAL
A. Recover refrigerant charge per instructions in
Section 5.2.
B. Cut the refrigeration line as close to the fi lter drier
as possible and remove drier.
C. Cap the ends of the drier using the plugs from
the new drier.
The drier must be capped to prevent moisture from
the environment
NOTE
FILTER DRIER REPLACEMENT
A. Position the fi lter drier so the arrow is pointing
towards the evaporators (pointing away from the
condenser).
B. Apply a heat sink (wet cloth) to the fi lter drier.
C. With the suction and discharge ports open, braze
the fi lter drier into the system using appropriate
brazing material.
D. Evacuate the system per instructions in Section
5.2.
E. Recharge the system per instructions in Section
5.3.
5.10 CAPILLARY TUBE & DRIER ASSEMBLY
The capillary tube meters refrigerant fl ow in the mix line
evaporator (Refer to Figure 5-13). The amount of fl ow is
dependent on the length and ID of the capillary tube as
well as the refrigerant charge.
Figure 5-13 Capillary Tube and Drier Assembly
CAPILLARY TUBE REMOVAL
The capillary tube assembly contains a drier. The
entire assembly must be removed.
A. Recover refrigerant charge per instructions in
Section 5.2.
B. Leave a port open to prevent pressure buildup
during capillary tube removal.
C. Remove foam insulation from the capillary tube
at the evaporator inlet.
C. Unsweat the capillary tube and remove.
CAPILLARY TUBE REPLACEMENT
A. Position the capillary tube so the arrow is pointing
towards the evaporators (pointing away from the
condenser).
B. Apply a heat sink (wet cloth) to the capillary tube
and drier assembly.
42
NOTE