Expansion Block/Orifice Tube: Service and Repair

HVAC Module:

Tool Required: J-26549-D Orifice Tube Remover and Extractor or Equivalent

REMOVE OR DISCONNECT
1. Discharge system.
2. Nut at liquid line to evaporator inlet pipe and remove tube carefully with needle nosed pliers or Special Tool.

INSTALL OR CONNECT
1. New orifice tube with shorter screen end in first.
2. Liquid line and torque to proper specification.
3. Evacuate and charge system.

NOTE In the event that difficulty is encountered during the removal of a restricted or plugged orifice tube, the following procedure is recommended:

1. Remove as much of any residue as possible.

NOTE If the system has a pressure switch near the orifice tube location, it should be removed prior to heating the pipe to avoid damage to switch.

2. Carefully apply heat with heat gun (hair drier, epoxy drier or equivalent) approximately 1/4 inch from dimples on inlet pipe. Do not overheat pipe.
3. While applying heat, use orifice removal tool AC-1002 or J26549-D to grip the orifice tube. Use a turning motion along with a push-pull motion to loosen to the impacted orifice tube and remove it.
4. Swab inside of evaporator inlet pipe with R-11 or equivalent solvent.
5. Add 1 oz. of 525 viscosity refrigerant oil to system.
6. Lubricate new orifice tube and "0" ring with clean 525 viscosity refrigerant oil and insert into inlet pipe. Install in proper direction (smaller screen first).