Carrier VECTOR 1550 Series Operation & Service Manual

62-61753-21 8-24LIQUID INJECTION OR ECONOMIZER VALVE UNLOADER VALVECOIL ASSEMBLY INTERNAL COMPONENTS111234567891061. Locking Nut2. Upper O-Ring3. Threaded Collar4. Coil5. Lower O-Ring6. Armature Tube7. Internal O-Ring8. Spring9. Armature10. Diaphragm11. Drilled WasherFigure 8-18. Solenoid Valves (ESV, LIV & USV)8.6.9 Economizer, Unloader, & Liquid InjectionSolenoid ValvesReplacing the CoilNOTEThe coil may be replaced without removing therefrigerant.a. Ensure the unit is disconnected from the powersource 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 Figure8-17).b. Verify coil type, voltage and frequency of old andnew coil. This information appears on the coil hous-ing.c. Ensure upper and lower O-rings are installed on topand bottom of coil and tighten locking nut to 1,2 to1,4Nm (10 to 18 inch-pounds).Repairing Valvea. Remove the armature tube, taking care the arma-ture and spring do not drop out.b. Ensure the spring is properly seated in the armatureand install into the armature tube.c. If the valve is of the diaphragm type, install thedrilled washer into the body with the concave endsdown and then install the diaphragm as shown inFigure 8-17.d. Install a new internal O-ring into the valve body andthen reinstall the enclosing tube with armature andspring.Replacing Valvea. To replace a valve, remove the refrigerant charge.(Refer to section 8.5.1).b. Ensure the unit is disconnected from the powersource and that SROS is in OFF position. Removecoil, refer to "Replacing the Coil" above.c. If servicing the unloader solenoid valve, disconnectthe inlet connection and remove O-ring.d. Unbraze valve from unit and braze new valve inplace. Wrap valve in wet rag and point flame awayfrom valve during brazing operation.e. For the unloader solenoid valve, procure newO-ring. Lubricate the O-ring, back side of sleevesand coupling nut. Using a backup wrench torque asfollowsConnection Torque ValueUnloader Solenoid Valve 81 to 89 Nm(60 to 66 ft-lbs.)f. Install coil, refer to "Replacing the Coil" above. Leakcheck, evacuate the unit and charge in accordancewith sections 8.5.2, 8.5.3 & 8.5.4.