Hitachi RAS-(4-12)HNP(1)(E) - Page 367

10 Servicing
353
SMGB0087 rev.0 - 12/2013
10
10.1 Safety Introduction
D A N G E R
DO NOT TOUCH THE ELECTRICAL COMPONENTS WHILE LED 201 (RED) ON THE INVERTER PCB OR LED1 (RED)
ON PCB1 OR LED4 ON PCB1 ARE ON, TO AVOID ELECTRICAL SHOCK.
WAIT UNTIL ALL LEDS TURN OFF.
D A N G E R
• Before performing any of the service operations described in this chapter turn all the main switches off and the
place security lockers or convenient warning indicators in order to prevent them from turning on accidentally.
• In case of blocked or stucked parts use appropiated tools and eventually lubricants to release them.
• In case of sharped edged parts as covers use security gloves to avoid getting injured.
• When performing brazing work besides security gloves it is must to wear convenient eye protection.
• Check and be sure that the LED201 (Red) on the inverter PCB is OFF for all electrical maintenance.
N O T E
• Allcompressorsareconnectedbybrazing.Checktoensurewhetherthereareammablethingsaroundornotwhen
usingaburnerforpipeconnectionsifnotoilexistingpipeinsidemayignite.
• Donotexposetherefrigerantcycletotheatmosphereforalongperiodinordertoavoidmixingthewaterandforeign
particlesintotherefrigerantcycle.Afterremovingcompressorreplaceitquickly.Ifexposedforalongperiodsealthe
suctionpipeanddischargepipe.
• Removethecapforthecompressorjustbeforereplacingthecompressor.Beforemountingthecompressorsealthe
suctionpipeanddischargepipewithatapetoprotectthecompressorfromforeignparticles.Removethetapeatpipe
connection.
• CautionforReplacementofCompressor
Removethesuctionpipeandthedischargepipefromthecompressor.Isolatethewiresandelectricalcomponentsto
protectthemfromtheburneramewhenbrazingtheconnectionpipes.
Whenreplacingthecompressor,thebrazedmaterialusedforconnectingthecompressorandrefrigerantpipescandrop
intothepipesandgetsuckedintothecompressor,causingacompressorfailure.Toavoidthis,takethefollowingpoints
intoaccountwhenreplacingthecompressor:
a. File away brazing material remaining on the
end of the refrigerant pipes.
C A U T I O N
Becarefultoavoidledbrazingmaterialen-
teringintothepipes.
b. Insert the pipes fully in to prevent brazing
material from entering them.
8
10
Suction and dischar-
ge pipe removed
from compressor
File away the brazing
material remaining on the
end of the suction and
discharge pipes
Suction pipe
Discharge pipe
c. Refer to the table for the recommended
amount of brazing material. If using more
brazing material than the recommended
amount, it may drop into the pipes.
C A U T I O N
When brazing the pipes, prevent oxidized
scaleformationbynitrogensubstitution.
Thickness
of brazing
material
Piping diameter (refrigerant cycle side) (mm)
Ø6.35 Ø9.52 Ø12.7 Ø15.88 Ø19.05 Ø22.2 Ø28.2
Ø1.6mm 25 30 35 75 100 110 225
Ø2.0mm 15 15 20 45 55 70 135
Ø2.4mm 10 10 15 30 35 45 90