Hi-Therma Monobloc System (Ahz-044/080Hcds1) - Hisense Hi-Therma Series Service Handbook

Hi-Therma Monobloc System (AHZ-044/080HCDS1)

2.4 Hi-Therma Monobloc System (AHZ-044/080HCDS1)
Safety Introduction
!
D A N G E R
DO NOT TOUCH THE ELECTRICAL COMPONENTS WHILE LEDS on O.U. MAIN PCB or LED1 on O.U. DISPLAY PCB
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 stuck parts use appropriate 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 O.U. main PCB or display PCB are OFF for all electrical maintenance.
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N O T E
● All compressors are connected by brazing. Check to ensure whether there are flammable 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 flame 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.
b . Insert the pipes fully in to prevent brazing material from entering them.
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.
Discharg e pipe
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C A U T I O N
When brazing the pipes, prevent oxidized scale formation
by nitrogen substitution.
Suction pipe
Suction and discharge pipe removed from
compressor
File away the brazing material remaining on the end of the suction
and discharge pipes
Thickness
of brazing
material Ø6.35
Ø1.6mm
Ø2.0mm
Ø2.4mm
438
Piping diameter (refrigerant cycle side) (mm)
Ø9.53 Ø6.35 Ø12.7 Ø15.88 Ø19.05 Ø22.2
25 30 35 35
15 15 10 20
10 10 15 15
75 100 110
45 55 70
30 35 45