Hitachi UTOPIA RAS-4HVRP2E Service Manual page 193

9 Servicing
RAS-(4-6)H(V)(R/N)(C/P)2E
15 Remove the vibration-proof rubber -2- and the vibration-proof rubber -3-.
!
C A U T I O N
• To remove the compressor the liquid stop valve pipe should be moved (bent) to the right side hand. PAY CLOSE ATTENTION not to
crush to break the pipe.
• The compressor is a heavy component, two personnel are recommended to handle it.
16 Remove the compressor by lifting it up with inclining forward.
17 Install the new vibration-proof rubber -3-.
!
C A U T I O N
• Compressor piping must be connected by brazing. MAKE SURE that any flammable material is not around before heating with burner,
the oil inside the piping may flame up.
• The replacement of the compressor should be done immediately after removing. Seal the suction and discharge pipes when the re-
frigerant cycle is left unattached for a long period.
• For piping at reassembling ensure that the compressor terminal numbers and wiring mark band codes are matched.
18 Place the new compressor -4- in its place.
19 Protect the compressor side pipping -2- with a wet cloth -3-.
?
N O T E
A wet cloth will cool the compressor side piping in order to avoid the brazing material from entering the compressor.
20 Remove the tapes of new compressor right before the brazing and face the piping with the compressor.
21 Insert the pipes fully in to prevent brazing material from entering them.
22 Charge the check joint -1- with nitrogen and refill the compressor piping.
?
N O T E
• Be sure to separate the blazing burner flame sufficiently from the wires and electrical components around the brazed part in order to
avoid burning.
• PAY CLOSE ATTENTION not to let the filler metal enter into the compressor which may result in compressor damage.
• Refer to the table for the recommended amount of brazing material. If using more brazing than the recommended amount, it may drop
into the pipes.
Thickness of brazing material
Ø1.6mm
Ø2.0mm
Ø2.4mm
191 SMGB0136 rev.0 - 07/2021
3
Piping diameter (refrigerant cycle side) (mm)
Ø6.35 Ø9.5 Ø12.7
25 30 35
15 15 20
10 10 15
1
2
Ø15.9 Ø19.1 Ø22.2
75 100 110
45 55 70
30 35 45
9
Ø28.2
225
135
90