Carrier GR-45 Operation And Service

Contents

Carrier GR-45 Operation And Service Manual pdf 41 page image

T-295 4-84.15 SERVICING THE LIQUID LINE SOLENOIDVALVEThe Liquid line solenoid valve (Figure 4-10) is verysimilar to the heat valve. It requires no maintenanceunless a malfunction to the internal parts or coil occurs.This may be caused by foreign material such as: dirt,scale, or sludge in the refrigeration system, or impropervoltage to the coil.There are only three possible valve malfunctions: coilburnout, failure to open, or failure to close.Coil burnout may be caused by the following:1 Improper voltage.2 Continuous over-voltage, more than 10% or under-voltage of more than 15%.3 Incomplete magnet circuit due to the omission of thecoil hosing or plunger.4 Mechanical interface with movement of plungerwhich 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 connections.2 Improper voltage.3 Defective plunger or deformed valve body assembly.Failure to close may be caused by the following:1 Defective plunger or deformed valve body assembly.2 Foreign material in the valve.4.15.1 Coil Replacementa. It is not necessary to remove the refrigerant chargefrom the system.b. .Place main battery disconnect switch in OFF posi-tion and lock.c. Disconnect wire leads to coil.d. Remove coil retaining clip and nameplate.e. Lift burned-out coil from enclosing tube and replace.f. Connect wire leads and test operation4.15.2 Internal Part Replacementa. Place main battery disconnect switch in OFF positionand lock.b. Perform a low side pump down. Refer to paragraph4.5.1.c. Slowly loosen enclosing tube assembly to bleed anyremaining pressure from the valve. Disassemblevalve and replace defective parts.d. Assemble valve and leak check.e. Evacuate low side and re--open system.123456781. Snap Cap2. Coil Assembly3. Enclosing TubeAssembly4. Plunger Assembly5. Gasket6. Piston Assembly7. Body8. Bracket AdapterFigure 4-10. Liquid Line Solenoid Valve4.15.3.Replace Entire Valvea. Perform a low side pump down, remove coil andplunger assembly and un--braze valve from lines.b. Remove valve assembly from bracket.c. Disconnect wire leads to coil.d. Disassemble new valve, to protect internal parts, andsolder to lines.e. Assemble and leak check valve.f. Evacuate low side and re--open system.g. Connect wire leads and test operation.4.16 CONDENSER FAN/MOTOR ASSEMBLY4.16.1 Removala. Place main battery disconnect switch in OFF positionand lock.b. Unlatch motor draw latches. See Figure 4-11.c. Disconnect motor wire harness and lift motor out ofunit.4123451. Motor Support2. Draw Latch3. Fan/Motor Assembly4. Motor5. BrushFigure 4-11. Condenser Fan/Motor Assembly