SERVICE MANUAL
SERVICE MANUAL
NON FROST REFRIGERATOR
MODEL PRN348HW/HS
■ Contents
Parts Description.......................................................................................................................................................... 1
Circuit diagram ............................................................................................................................................................ 1
Cooling diagram .......................................................................................................................................................... 2
The guide for Disassembly Common parts of Refrigerator......................................................................................... 2
◆ The instruction of of replacing fan motor ...................................................................................................... 3
◆ The instruction of replacing thermostat .. ...................................................................................................... 3
◆ The instruction of replacing lamp .................................................................................................................. 4
◆ The instruction of replacing timer ................................................................................................................. 5
◆ The instruction of replacing door switch ....................................................................................................... 5
◆ The instruction of replacing PTC Starting relay and Overload protector. ..................................................... 6
Working principle: ....................................................................................................................................................... 6
Troubleshooting:.......................................................................................................................................................... 7
◆ The common problem judgement method ..................................................................................................... 7
◆ The solution for the common problem........................................................................................................... 8
Note: ...........................................................................................................................................................................11
Exploded view: ...........................................................................................................................................................11
Parts list: .................................................................................................................................................................... 15
■ Parts Description
1. Air flow cover
2. Ice tray
3. Freezer shelf
4. Freezer temperature
5. Controller
6. Refrigerator shelf A
7. Door light switch
8. Temperature adjust control
9. Lamp cover
10. Refrigerator shelf B
11. Side plate
12. Crisper cover
13. Crisper
14. Adjustable foot
15. Door shelf
16. Front foot
■ Circuit diagram
1
■ Cooling diagram
■ The guide for Disassembly Common parts of Refrigerator
2
◆ The instruction of of replacing fan motor.
Remove the ice
storaging box
Remove the Wind
patch cover in freezer
chamber
Unscrew the
assembly of fan motor
Fan motor parts
Remove the screws
of the racket
and replace the fan
motor
◆ The instruction of replacing thermostat.
3
The location of the
Control assembly in
refrigerator chamber
Remove and take out
the Control assembly
in refrigerator
chamber
Remove the back
board of the Control
assembly
Remove connecting
wire and fixing screw
of the thermostat
◆ The instruction of replacing lamp.
The location of the
lamp
4
Remove the light
cover and replace the
lamp
◆ The instruction of replacing timer.
Remove the screws of
Timer cover.
Take out timer and
loose the connecting
wire
◆ The instruction of replacing Door switch.
The location of door
switch
Take out the door
switch with a
screwdriver
5
◆ The instruction of replacing PTC Starting relay and Overload protector.
The location of the
PTC Starting relay
and Overload
protector.
take down Spring
Tap and Cover.
Disconnect the
connecting wire of the
PTC Starting relay
and Overload
protector.
■ Working principle
This refrigerator holds a Automatic Defrost System,monitored by mechanical control,This system is
constituted of the following components:
·Defrost Timer
·Defrost Thermostat
·Thermal Fuse
·Defrost Heater
The defrost frequency is defined by the mechanical control throughout the following:
Defrost can occur by the Compressor accumulated working T1 hrs,the internal contacts of Defrost
Timer put through defrost circuit and the Defrost Heater start to heating . So that the surface of the
evaporator temperature goes up and reaches the setting temperature of the Defrost Thermostat(the
setting temperature around 6℃),the Defrost Thermostat acts immediately,and the Defrost Heater will
stop heating. The compressor will start again after the delay time of T2 minutes by the Defrost Timer. So
goes on next defrost cycle.
There are two circuit protection for the Defrost circuit. One is by the action of the Defrost Thermostat,the
other is by the two Thermal uses. If the Defrost Thermostat fails to cut off the power of the Defrost Heater,
6
and the surface temperature of evaporator continues go up ,when it reaches the setting value of the
Thermal Fuse,around 72℃,Thermal Fuse fusing will open and until disconnect the defrost circuit to
protect the safety of the refrigerator.
Note:
T1 means the accumulated working time of the Defrost Timer(12 hours)
T2 means the recovery time for the Defrost Timer(10 minutes)
T1&T2 are the parameters of the Defrost Timer
■ TROUBLESHOOTING
◆ The common problem judgement method
Problem
Cause
Refrigerator can’t
start
1.1 Is the power cord connecting well?
1.2 Is the power voltage too low?
1.3 Is the sensor irrational setting?
1.4 Is the ambient temperature too low?
1.5 Is the circuit on power?
1.6 Is there some default in compressor
1.7 Is the refrigeration system blocked by ice or dirty, please stop the unit and
restart after 10 minutes to see if the compressor can start.
Weak cooling effects
2.1 Is there any heat source around the refrigerator?
2.2 Is there enough space around the refrigerator for rejection of heat?
2.3 Is the setting of the temperature appropriate?
2.4 Is there too much food or overheating food in it?
2.5 Does there open the door frequently?
2.6 Is the door completely closed?
2.7 Does the gasket destroyed or distort?
2.8 Does the gas leak?
The unit can not stop
running
3.1 Is there any heat source around the refrigerator?
3.2 Is there enough space around the refrigerator for rejection of heat?
3.3 Is the setting of the temperature appropriate?
3.4 Is there too much food or overheating food in it?
3.5 Does there open the door frequently?
3.6 Is the door completely closed?
3.7 Does the gasket destroyed or distort?
3.8 Is the thermostat good operation?
3.9 Does the gas leak?
Ice up in the freezing
chamber
4.1 Is the setting of the temperature appropriate?
4.2 Is there multi-moisture food and too close to the back wall of the refrigerator?
4.3 Is the ambient temperature too low?
4.4 Is the electric parts on good condition, specially the thermostat wich will
cause the unit non-stopping .
Abnormal noise
5.1 Is the refrigerator stably placed?
5.2 Does the refrigerator bump other objects?
7
5.3 Whether the internal accessory of the refrigerator is in the right place.
5.4 Whether the water plate of compressor is fall from the unit.
5.5 Does the tube of the refrigeration system bump each other?
5.6 The noise sound likes Water flow inside the refrigerator ,in fact ,it is normal,
which is caused both when refrigerator start and shut-down; in addition,
frost-dissolving causes this sound, too, which is a normal phenomenon.
5.7 There will be a cracking sound in the cabinet ,when the cabinet or cabinet
accessory contracting or expanding, this sound will be made, which is normal.
5.8 The motor operation sound in the compressor is appears to be louder at night
or begin starting. which is a normal phenomenon; also the uneven placing would
lead to too much running noise.
There is a peculiar
smell in the units
6.1 Is the food with special smell sealed tight?
6.2 Does it have long time storing food or degenerated food?
6.3 Whether the internal cabinet needs cleaning.
the forefront or the
middle cabinet heats
7.1 As fridge Anti-condensation tube is placed here and caused the above
phenomenon, which is normal.
Refrigerator’s two
sides or the back
heat
8.1 As condensation tube is placed here and caused the above phenomenon,
which is normal.
the cabinet surface
condensation
9.1 Air humidity is too large.
◆ The solution for the common problem.
1.Cooling is not enough good
(Many reasons might cause that cooling not enough good, as blow :)
Reason
analysis
Solutions
1) Leakage of Gas
If some gas leaked unit will work not well.
Phenomenon of failure:
a. lower pressure of liquid cycle system
b. high temperature of copper tube of
discharging gas, hand feels very hot.
C. much noise, sounds like “ZZZZZ”, comes
from outlet of capillary.
d. the temperature fell down very slowly.
First find out the point of leaking
on tube, and then sealed it,
vacuuming it, finally recharge with
Gas.
Note:
If you find oil on somewhere, it is
possible that leakage point is
there.
2) The quantity of
Gas is too much
If too much Gas was charged into the cycle
system, the extra gas will occupy some
space of evaporator, so that the area of heat
exchange becomes less, unit will work not
well.
Phenomenon of failure:
a, higher pressure of liquid cycle system
than norm.
b, higher temperature of condenser.
c, larger electric current of compressor
d, there maybe ice on the suction tube.
First stop unit for several minutes,
and then open charging tube,
discharge all of gas. Change a
new filter, and then recharge gas,
finally sealed the system.
8
e, when gas is too much, some gas liquid
might goes back into compressor,
compressor will be damaged by liquid.
3) There is air in the
liquid cycle system
The air in system will cause lower efficiency
of cooling.
Phenomenon of failure:
a, higher pressure of liquid cycle system
than norm, but the pressure is not over the
limit.
b, higher temperature of discharging tube.
C, much noise
First stop unit for several minutes,
and then open charging tube,
discharge all of gas. Change a
new filter, and then recharge gas,
finally sealed the system.
4)Low working
efficiency of
compressor
General when a compressor works for many
years, some parts of compressor were wear,
so that compressor discharge less gas out,
unit does not work strongly.
Phenomenon of failure:
a, lower pressure of discharging, check the
pressure of system with pressure meter to
see if it is normal.
b, higher temperature of compressor
surface.
C, cut off the discharging tube, to see if you
can block the gas coming out of the tube
when compressor is working.
Change a new compressor.
5) There is something
that blocked the liquid
cycle system
Some time there is something blocked the
filter of liquid cycle system, so that unit is not
cold.
Phenomenon of failure:
a, lower pressure of discharging
b, lower temperature of discharging.
Change a new filter
2.NO COOL
(Popular failure reasons are below):
Reason
1) Leakage of gas
2)There is some thing
that blocked the liquid
cycle system
analysis
Solutions:
Phenomenon of failure:
a, leaking fast
b, leaking slowly
c, no voice of liquid flowing
d, cut off charging tube, no gas
goes out.
First find out the point of leaking on tube,
and then sealed it, vacuuming it, finally
recharge with gas.
Note:
If you find oil on somewhere, it is possible
that leakage point is there.
A,Ice blocking
Sometime because unknown
reason water comes into liquid
cycle system, the capillary will be
blocked by water after unit runs for
period of time.
Phenomenon of failure:
First stop unit for several minutes, and then
open charging tube, discharge all of gas.
Blow the cycle system with gas of nitrogen,
and then recharge Gas, finally sealed the
9
system.
The unit works well in the
inception, after period of time the
ice appears in the capillary and
becomes more and more, till
blocks the hole of capillary
completely. In the moment you
can find the ice on the evaporator
defrosts. The noise of liquid flow
disappears. The pressure of
absorbing becomes negative.
The phenomenon above will
appear again and again.
The way to check ice blocking:
Warm the capillary with a hot
towel, after a while the ice in the
capillary melt, you can hear a
sound of gas flow comes from the
capillary abruptly. The pressure of
absorbing becomes higher. It is
Ice blocking.
B, there is offal block the capillary
Phenomenon of failure:
If the capillary is blocked by
something such as offal etc., the
sound of liquid flow disappears.
The ice on the evaporator defrosts
The pressure of absorbing
becomes negative.
Higher temperature of discharging
tube
The way to check offal blocking:
If you warm capillary with the way
of checking ice blocking, there is
no change. It must be offal
blocking.
First stop unit for several minutes, and then
open charging tube, discharge all of gas.
Blow the cycle system with gas of nitrogen.
Change a new capillary and filter, and then
recharge Gas, finally sealed the system.
COMPRESSOR NEVER STOPS:
Reason
Solutions
1)The setting temperature is not reasonable.
Readjust the temperature setting.
2) the sensor is bad.
Replace the sensor.
3)Seal of door is damaged.
Replace the gasket
4)Too much food in the refrigerator
Please put the food properly.
5)Wind door is broken.
Replace wind door.
6)Fan motor is broken.
Replace fan motor
10
■
●
Note:
Before doing these operations above, disconnect the main power supply. Failure to do so could result
in electrical shock or personal injury.
●
■
In case of any detailed technical information please check with the technical specifications.
Exploded view
11
12
13
14
■
Parts list
RD-42WR4S#(BCD-320W/HC(EX))
PARTS
LIST(220-240V/50HZ )
No
Part name
Part No
pcs
Chinese
Name
Remark
1
Upper hinge cover
1110018
1
上门铰盖
B05210126
2
Flange screw M5x20
1111468
6
法兰面螺钉 M5 x20
B07040003
3
Upper hinge parts
1056936
1
上门铰部件
B01080035
4
Coping screw cap
1055516
5
顶板螺钉孔盖
B05090032
5
Screw nail
17013
4
自攻螺钉 ST4.2x13
GB845-85
6
Back corner cover
1110022
2
后角盖
B05210127
7
Mid-hinge hole cover
1051010
1
中门铰孔盖
B05130001
15
8
Screw cap
1065648
1
螺钉盖
B05210040
9
Cabinet
3100100923-34
1
箱体
BCD320W/HC(EX).08-00
10
Screw cap
1065602
1
螺钉盖
B05210038
11
Mid-hinge hole cover
1065656
2
中门铰孔盖
B05210043
12
front leg
1056893
1
前脚部件
B01100011
13
Short front leg
1065091
1
矮前脚
B05230002
14
Lower hinge assembly
1056995
1
下门铰部件
B01080094
15
Lamp switch
1055831
1
门开关
B03100001
16
Mid-Hinge bottom plate
1101409
1
中门铰垫片
B05130054
17
Mid-hinge
1057026
1
中门铰
B01080056
18
Flange screw M5x30
1701164
2
法兰面螺钉 M5x30
BDG36-14
1078497
2
温度熔断器
B03350004
19
Temperature fuse unit
assembly
20
Defrosting thermostat
1115606
1
防爆除霜恒温器
B03360006
21
Evaporator
1117735
1
蒸发器
B01270025
22
Defrosting heater
1117809
1
除霜加热管
B03090043
23
Defrosting heater
1117810
1
除霜加热管
B03090042
24
Water trough
1052481
1
接水槽
B04130001
25
Reflecting aluminum foil
1115219
1
反射铝箔
B06070017
1064844
1
冷冻室风道泡沫
B09060017
1064800
1
温度调节滑块
B05130030
1064826
1
冷冻室风道盖板
B05050015
26
27
28
Wind channel foam of freezer
chamber
Temperature regulating
guiding
block
Wind patch cover in freezer
chamber
29
Screw nail
1113106
6
自攻螺钉 4x12
GB845-76
30
Washer
1078308
6
台阶垫圈
B05130041
31
Screw nail
1115520
4
自攻螺钉 ST3.5x13
GB845-85
32
Bracket A
1051471
1
支架 A
B04190003
33
Fan motor parts
1117826
1
防爆风扇电机
B03080025
34
Bracket B
1051472
1
支架 B
B04190004
35
Blade
1070335
1
风叶
B05100048
36
Bracket C
1111254
1
支架 C
B05110185
37
Ice sucker
1115191
1
制冰格组件
B01230016
16
38
Ice storaging box
1111306
1
储冰盒
B05080116
39
Freezer glass shelf
1055299
1
冷冻室玻璃层架部件
B01450026
40
Refrigeration glass shelf
A
1055262
1
冷藏室玻璃层架部件 A
B01450125
41
Refrigeration glass shelf
B
1055263
2
冷藏室玻璃层架部件 B
B01450126
42
Crisper drawer cover
1114327
1
果菜箱盖部件
B01450026
43
Crisper drawer
1053507
2
果菜箱
B05040015
44
Collapsible
1050535
1
轴孔套
B05240004
45
Upper door
1072758
1
上门
B01130247
46
Stopper
1055580
1
助吸器
B05200013
47
Left door stopper
1055587
1
左助吸器
B05200016
48
Screw nail
1701192
2
自攻螺钉 ST4.2x16
GB846-85
49
Collapsible
1050535
1
轴孔套
B05240004
50
Lower door
1072759
1
下门
B01130248
51
Limitative block
1052503
2
限位块
B04190012
52
Protection rod
1072674
1
瓶挡
B04200008
53
Protection rod
1072756
1
瓶挡
B04200008
54
Shelf for upper door
1072671
6
上门搁架
B05110112
55
Lower door gasket
1054937
1
下门门封
B01140001
56
Upper door gasket
1054939
1
上门门封
B01140001
57
Electric circuit diagram
1118681
1
电路图铭牌
B08010471
58
Connecting wire box cover
1051718
1
接线盒盖
B05080038
59
Conjunction box
1051717
1
接线盒
B05080037
60
Screw nail
1701131
1
自攻螺钉
T00-22
61
Timer for defrosting
1119140
1
除霜定时器
B03340010
62
Water-disposal pipe cover
1110989
1
排水管管盖
B05060059
63
Timer cover
1118557
1
定时器盒盖
B05210211
64
Drier filter
1051110
1
干燥过滤器
B02050001
65
Compressor base
1051238
1
压缩机托板
B01090023
66
Round-pad 5
1099101
2
螺母 M4
GB/T6170-2000
1069739
1
澳大利亚带插头电源线
B03120001
1099127
2
4/65Mn
GB/T862.1-87
67
68
Power cable with
Australia
Round-pad 5
plug for
17
69
Screw M4 x 8
1099102
2
螺钉 M4x8
GB/T818-2000
70
Baffle
1064952
1
挡板
B05100041
71
Screw nail
170113
10
自攻螺钉 ST4.2x9.5
GB 845-85
72
Block
1064887
1
泡沫 A
B09060044
73
Temperature control
1113110
1
防爆温控器
B03240033
1064922
1
冷藏室控制器泡沫
B09060063
1064914
1
冷藏室控制器面板
B05100045
74
75
A
Control foam in
refrigerator chamber
Control panel in refrigerator
chamber
76
Screw cap
1070958
11
螺钉盖
B05210073
77
Temperature control knob
1051743
1
温控器旋钮
B05190016
78
Lamp holder
1050096
1
灯座
B03210007
79
Bulb
1050072
1
螺口灯泡
B03230001
80
Fixed seat for lamp holder
1113172
1
灯座固定块
B04190047
81
Lamp cover
1051722
1
灯罩
B05210016
82
Screw nail
1099082
1
自攻螺钉 ST4.2x13
GB845-85
83
Connecting tube
1051127
1
连接管
B02080003
84
Impact board
1072839
1
压板
B04110042
85
Impact board
1111096
1
右压板
B04110042
86
Nut M6X20
1111717
2
螺母 M6X20
GB/T 70.1-2000
87
Washer 6
1099120
4
垫圈 6
GB/T96.1-2002
88
Water disposal pan
1078472
1
接水盘
B05080088
89
Compressor connecting wire
1055616
1
压缩机连接线
B03170004
90
Compressor grounding wire
1054598
1
压缩机接地线
B03170003
91
anti-vibretion rubber plate
1111696
4
防震橡胶块
B09010030
92
Sheath
1072971
2
钢套
B04280004
93
Process tube
1051105
2
封尾管
B02070001
94
Compressor
1112186
1
压缩机
EMB55CLC
18
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