Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 8-24
LIQUID INJECTION OR ECONOMIZER VALVE
UNLOADER VALVE
COIL ASSEMBLY
INTERNAL COMPONENTS
11
1
2
3
4
5
6
7
8
9
10
6
1. Locking Nut
2. Upper O-Ring
3. Threaded Collar
4. Coil
5. Lower O-Ring
6. Armature Tube
7. Internal O-Ring
8. Spring
9. Armature
10. Diaphragm
11. Drilled Washer
Figure 8-18. Solenoid Valves (ESV, LIV & USV)
8.6.9 Economizer, Unloader, & Liquid Injection
Solenoid Valves
Replacing the Coil
NOTE
The coil may be replaced without removing the
refrigerant.
a. Ensure the unit is disconnected from the power
source and that SROS is in OFF position. Discon-
nect coil leads. Remove locking nut, upper O-ring,
threaded collar coil and lower O-ring (See Figure
8-17).
b. Verify coil type, voltage and frequency of old and
new coil. This information appears on the coil hous-
ing.
c. Ensure upper and lower O-rings are installed on top
and bottom of coil and tighten locking nut to 1,2 to
1,4Nm (10 to 18 inch-pounds).
Repairing Valve
a. Remove the armature tube, taking care the arma-
ture and spring do not drop out.
b. Ensure the spring is properly seated in the armature
and install into the armature tube.
c. If the valve is of the diaphragm type, install the
drilled washer into the body with the concave ends
down and then install the diaphragm as shown in
Figure 8-17.
d. Install a new internal O-ring into the valve body and
then reinstall the enclosing tube with armature and
spring.
Replacing Valve
a. To replace a valve, remove the refrigerant charge.
(Refer to section 8.5.1).
b. Ensure the unit is disconnected from the power
source and that SROS is in OFF position. Remove
coil, refer to "Replacing the Coil" above.
c. If servicing the unloader solenoid valve, disconnect
the inlet connection and remove O-ring.
d. Unbraze valve from unit and braze new valve in
place. Wrap valve in wet rag and point flame away
from valve during brazing operation.
e. For the unloader solenoid valve, procure new
O-ring. Lubricate the O-ring, back side of sleeves
and coupling nut. Using a backup wrench torque as
follows
Connection Torque Value
Unloader Solenoid Valve 81 to 89 Nm
(60 to 66 ft-lbs.)
f. Install coil, refer to "Replacing the Coil" above. Leak
check, evacuate the unit and charge in accordance
with sections 8.5.2, 8.5.3 & 8.5.4.