Hitachi RAS-10HRNM, Service Manual, Page: 370 / 482

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Removing expansion valve coil
1 Remove the service cover according to the section Removing service cover , see on page 355 in this chapter.
2 Open the P-mounting plate according to the section Opening electrical box (P-mounting plate) , see on page 361 in this
chapter .
D A N G E R
• Check that the LED201 (red) located on the “W” surface PCB is OFF when opening the P-mounting plate.
• Do not touch the electrical components when LED201 (Red) located on the “W” surface PCB is ON in order
to avoid an electrical shock.
3 Remove the CN5A connector on the control PCB of the electrical box.
4 Hold the expansion valve coil and slightly rotate, then pull it up. Refer to the figure below to replace the electrical valve.
The lock mechanism is equipped with the expansion valve coil. Check to ensure that the expansion valve coil is locked.
1. Pull out the electronic expansion valve coil upwards.
2. Release lock.
3. Electronic Expansion Valve Coil.
4. Liquid Tank.
5. Lock Part.
6. Electronic Expansion Valve.
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Removing reversing valve
1 Remove the service cover and rear service panel according to the sections Removing service cover , see on page
355 and Removing bottom service cover and rear cover , see on page 355 in this chapter.
2 Collect the refrigerant from the check joint according to the section Removing the compressor , see on page 357 .
3 Remove the reversing valve coil according to the section Removing reversing valve coil , see on page 361 .
4 Remove one (1) fixing screw for the valve-mounting plate.
5 Remove the stop valve at the gas side from the valve-mounting plate by removing the two (2) screws.
6 Remove the reversing valve assemblies from the 4 brazed parts where it is fixed. Remove the brazing of the reversing
valve and the stop valve at the gas using a blowtorch. Cool down the piping side covering it with wet cloth, in order to
avoid brazing material entering the reversing valve. Protect the connecting wires and pipe insulation from the brazing
frame.
7 Remove the reversing valves from its assemblies 4 brazed parts.
8 Perform the brazing with a blowtorch remove and reassemble the reversing valve by cooling the pipes first with wet
cloth in order to avoid brazing material entering the reversing valve.
9 Reassemble the parts in the reverse order of removing procedures contained in this chapter. When SFV is removed,
fix it according to the sections
Remove solenoid valve , see on page 363 contained in this chapter.
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10 Servicing
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SMGB0060 rev. 1- 12/2010