Expansion Valve: Service and Repair
REMOVAL1. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM
2. DISCONNECT LIQUID AND SUCTION TUBES FROM A/C UNIT
3. REMOVE BLOWER UNIT
4. REMOVE EXPANSION VALVE
a. Remove the piping clamp.
b. Ply out the packing.
HINT: Do not reuse the packing.
c. Using a hexagon wrench, remove the 2 bolts and separate the expansion valve and evaporator.
INSTALLATION
1. INSTALL LIQUID TUBE AND SUCTION TUBE TO EXPANSION VALVE
HINT: Lubricate 4 new O-rings with compressor oil and install the tubes.
2. INSTALL NEW PACKING ON EXPANSION VALVE
a. Cut off packing paper and peel off the packing paper, as shown in the illustration.
HINT: Leave the packing paper untaped on the tube side so that the installing bolt hole for remains visible.
b. Apply the packing on the expansion valve.
NOTE: Do not overtape the packing beyond the expansion valve edge.
3. INSTALL EXPANSION VALVE
a. Install the expansion valve with the 2 bolts.
Torque: 5.4 N.m (55 kgf.cm, 48 in.lbf)
NOTE: When installing the expansion valve, take care so that the packing is not jammed with the evaporator.
HINT: Lubricate 2 new O-rings with compressor oil and install O-rings on the expansion valve.
b. Peel off the remaining packing paper and apply the packing to expansion valve.
4. INSTALL BLOWER UNIT
5. INSTALL GLOVE COMPARTMENT
6. CONNECT LIQUID TUBE AND SUCTION TUBES TO A/C UNIT
7. EVACUATE AIR FROM REFRIGERATION SYSTEM AND CHARGE SYSTEM WITH REFRIGERANT
Specified amount: 800 ± 50 g (28.22 ± 1.76 oz.)
8. INSPECT FOR LEAKAGE OF REFRIGERANT
Using a gas leak detector, check for leakage of refrigerant.
If there is leakage, check the tightening torque at the joints.