Carrier Transicold X4 7300, Operation & Service Manual

Page: 252 / 282

62-11637 8–38
4. Using a 12 point, 1-3/8 inch box wrench, loosen
the enclosing tube locknut and bleed off any
remaining pressure.
5. Remove enclosing tube lock nut, enclosing tube
with plunger, gasket, and closing spring.
6. Remove seat disc from inside of body and check
for obstructions and foreign material.
7. Procure kits (rebuild kit or metal gasket kit) for
reassembly as required.
8. Place the seat disc into the valve body with the
smaller diameter end facing up.
9. Install the closing spring, gasket, enclosing tube
with plunger and the enclosing tube lock nut.
Torque enclosing tube locknut 30 to 40 ft-lb
(40.7 to 54.2 Nm). If valve body has been
replaced, torque mounting screws 30 to 34 inch/
lbs (3.4 to 3.9 Nm).
10. Install coil, refer to preceding step b.
11. Leak check, evacuate & dehydrate, and charge
system as required. Refer to Section 8.7.2 ,
8.7.3 & 8.7.4 .
12. Start unit and run Pretrip to check operation.
8.9.6 Liquid Line (SV2)/Hot Gas (SV4) Solenoid
Valves
Figure 8.32 SV-2 and SV-4
a. Replacing the Coil
NOTE
The coil may be replaced without removing
the refrigerant or pumping the unit down.
1. Ensure the unit will not start automatically by
disabling any two way communication, placing
the STOP/RUN-OFF switch in the OFF position
and removing the negative battery cable.
2. Remove the retainer ( Figure 8.32 ).
3. Disconnect wiring and remove coil.
4. Replace coil by reversing the preceding steps.
b. Replacing Internal Components
CAUTION
!
Service Mode MUST be used whenever
removing refrigerant charge, refrigerant
leak checking or evacuating.
1. To service the liquid line solenoid valve, pump
the unit down. (Refer to Section 8.7.2 , step d.).
To service the hot gas solenoid valve, remove
the refrigerant charge. (Refer to
Section 8.7.2 .)
2. Ensure the unit will not start automatically by
disabling any two way communication, placing
the STOP/RUN-OFF switch in the OFF position
and removing the negative battery cable.
3. Remove the retainer ( Figure 8.32 ), disconnect
wiring and remove coil.
4. Loosen the enclosing tube and bleed off any
remaining pressure.
5. Remove enclosing tube, plunger spring, plunger
and gasket.
6. Remove piston from inside of body and check
for obstructions and foreign material.
7. Procure kits (rebuild kit or gasket kit) for reas-
sembly as required. Gasket kit may contain
more than one type gasket, replace with same
color gasket as originally installed in valve.
8. Place the piston into the valve body.
9. Install piston, gasket, plunger, plunger spring
and enclosing tube. Torque enclosing tube 19 to
23 ft-lb (25.4 to 31.1 Nm).
10. Install coil and retainer
11. Leak check, evacuate & dehydrate, and charge
system as required. Refer to Section 8.7.2 ,
8.7.3 & 8.7.4 .
12. .Start unit and run Pretrip to check operation.
Retainer
Coil
Enclosing
Tube
Plunger
Spring
Plunger
Gasket
Piston
Body