Hitachi UTOPIA RAS-4HVRP2E - Safety Introduction

9 Servicing
Safety Introduction
SMGB0136 rev.0 - 07/2021
176
9.1 Safety Introduction
! DANGER
DO NOT TOUCH THE ELECTRICAL COMPONENTS WHILE LEDS 1~4/351~353 on PCB1 or LD1~4 on PCB2 ARE ON, TO AVOID
ELECTRICAL SHOCK.
WAIT UNTIL ALL LEDS TURN OFF.
! DANGER
• Before performing any of the service operations described in this chapter turn all the main switches off and the place secu-
rity 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 all LEDS on the PCB are OFF for all electrical maintenance.
? NOTE
• 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.
! CAUTION
Be careful to avoid led brazing material entering into the
pipes.
b. Insert the pipes fully in to prevent brazing material
from entering them.
10
8
Suction and
discharge 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.
! CAUTION
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