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. Pry out the packing.
b. Using a hexagon wrench (5.0 mm, 0.20 in.), remove the 2 bolts and tube.
NOTE: Cap the open fittings immediately to keep moisture or dirt out of system.
c. Remove the expansion valve.
INSTALLATION
1. INSTALL TUBE AND ACCESSORY TO EXPANSION VALVE
a. Lubricate 2 new O-rings with compressor oil and install them to the valve.
Compressor oil: ND-OIL 8 or equivalent
b. Install the tube and accessory to expansion valve.
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 installation 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 TO EVAPORATOR
a. Lubricate 2 new O-rings with compressor oil and install them to the valve.
Compressor oil: ND-OIL 8 or equivalent
b. Using a hexagon wrench (5.0 mm, 0.20 in.), 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.
c. Peel off the remaining packing paper and apply the packing to expansion valve.
4. INSTALL BLOWER UNIT
5. CONNECT LIQUID AND SUCTION TUBES TO A/C UNIT
6. CHARGE SYSTEM WITH REFRIGERANT
a. Evacuate air from refrigeration system.
b. Charge system with refrigerant.
Specified amount: 800 ± 50 g (28.22 ± 1.76 oz.)
7. INSPECT FOR LEAKAGE OF REFRIGERANT
Using a gas leak detector, check for leakage.
If there is leakage, check the tightening torque at joint or piping clamps.