Service Manual for chest freezer
PREMIUM MODEL
PFR231XW
1
Content Table
（一）Main feature and product appearance---------------------2
（二）Unit Specification----------------------------------- 3
（三）Safety during maintenance or service ------------- 3
（四）Electrical Diagram ------------------------------- 4
（五）Cooling System Diagram --------------------------- 5
（六）Part Lists and explanation ---------------------------- 5
（七）
Disassembling and replacing of the components
---------6
（八）Check the breakdowns of the cooling system --------------7
（九）Table for quick answer for the field problem ------9
（十）Note of the cooling system maintenance
with R134a refrigerant -------------------------------13
（十一）The performance testing requirement after service--------14
（十二）Maintenance parts list ----------------------------- 15
2
（一）、Main feature：
Product appearance：
Shape one：PFR231XW
Model Door Gasket seal
for the door
Hinge Accessory Structure
PFR231XW
Tempered glass
door
seal.
no
5 baskets
inside
Front, Left and
right back side
shell
are made
metal with
aluminum internal
tank.
and unitary
plastic linear
mouth. It has inside
hidden evaporator
and condenser, and
unitary foaming
insulation.
3
(二)、 Unit Specification：
No.
Model PFR231XW
1 Net Capacity（L） 636L
2 Voltage（V） 115
3 Frequency（Hz）
60
4 Refrigerant R134a
5 Refrigerant Amount (g) 230g
(三)、Safety during maintenance or service:
In order to be safety during maintenance, must obey the following basic attention:
1. During service:
Pay attention to the flame or ignition nearby, particually after welding using gas too,
must turn off the flame first, then can do other maintenance work, because the refrigerant
will produce the toxic air when it touch with flame, sparkle or capacitor.
Do not do the welding work in the airtight or bad air circulation room.
When discharging the refrigerant, must keep the room good air circulation condition.
When cutting the suction pipe or discharging pipe of the compressor, pay attention to the
surplus refrigerant and internal pressure in cooling system pipe
2. Unplug the unit:
When you are ready to proceed the maintenance, must first unplug the freezer first to
ensure the safety.
3．Avoid electrical shock:
Normal when proceeding the maintenance, must open the power supply first. But if you
must check the field wiring or the component of the unit with power supply in, must be
very carefully and don’t touch the live parts. If you find out the wiring is aged, please
replace it in time.
4．Correct use the components:
If the component is damaged and need to be replaced, be sure to replace with the
component with same model，do not use other models or other brand components, and
not use the changed component.
5．Correct use the service tools:
Ensure to use the appropriate service tool right. Otherwise it will cause bad electrical
4
contact or loose fixing, and the incidence will happen.
6．Wiring connection:
When re-connecting the cut wire, be sure to use soldering method or terminal connection,
and then wrap the connection point with insulation tape, ensure the good connection.
7．Insulation resistance measure:
After completing the service and assembly，must use the multi-meter to measure the
insulation resistance, if it is greater than 1 million ohm, then you can plug on the unit.
8．Grounding test:
After maintenance, use the multimeter to measure the grounding resistance to ensure the
grounding resistance is less than 0.1 ohm.
9．Pay attention to the child or infant nearby:
When maintenance, don’t let the child or the infant nearby.
10．Cleaning:
After service, do the necessary cleaning work and tell the customer the necessary
precaution.
(四)、Electrical Diagram
Electrical diagram for PFR231XW
5
(五) 、Cooling System Diagram:
Capillary
Dry Filter
Evaporator
Condenser
Compressor
Air Suction Pipe
6
Note: Arrow direction means the flowing direction of the refrigerant.
（六）、Part Lists and explanation：
No. Parts Name
PFR231XW
Quantity
1 Door 2
2 Hinge 0
3 Basket 5
4 Freezer Cabinet 1
5 Thermostat cover 1
6 Compressor base 1
7
Condensate Water
Drain cap
1
8 Fixing feet 0
（七）、Disassembling and replacing of the components:
When replacing the components, must unplug the unit first, in order to be safety.
1． Replace the thermostat：
Unscrew the fixing screw of the thermostat box, remove the thermostat box, then
remove the old thermostat, install the new thermostat with same model, and reinstall back the
whole thermostat box with same fixing screw.
2．Replace the PTC starter and overload protector of the compressor：
Remove the clamp of the connecting terminal cover of the compressor and the terminal
cover, toward the vertical direction, remove the broken-down starter or overload protector, install
back the new starter or overload protector, then fix back the terminal box cover and its clamp.
3．Replace the door gasket seal:
Remove the old door gasket seal from the groove of the door linear, then install the new
gasket seal into the four sides of the groove, install it oven as possible, open and close the door
several times, ensure that the door is sealed.
4．Replace the compressor：
（1）、 First cut the welding point of the technical pipe of the compressor to discharge the
refrigerant inside the cooling system, then weld the old point to disconnect the pipe to the
compressor, remove the compressor to replace with a new one, pay attention to replace with a
new refrigerant dry filter.
（2）、 Install the new compressor, weld the high pressure side and low pressure side pipe to
the compressor, check the system leakage, after completing vacuum the cooling system,
7
charge the correct amount refrigerant into the system from low pressure side pipe. After this,
run the unit to check the cooling performance is ok or not, then weld and close the technical
pipe.
（八）、Check the breakdowns of the cooling system：
Following the next illustration to check the problem:
No
frost
Compressor
Check t he f r ost
on t he cabi net
l i ner sur f ace
Leakage
check
Cut of f t he
l ow pr eesur e pi pe
No refrigerant
air spurt out
Leakage
poi nt ?
On the
pipe joint
Ref r i ger ant
Leaks
Cut of f t he l ow pr essur e
pi pe and spur t out t he
r esi dual r ef r i ger ant
Repai r t he wel di ng,
cl ean t he pi pe and
r epl ace t he dr y f i l t er
Vacuumi ng and
r echar gi ng
Leakage
check agai n
Refrigerant
air spurt out
Cut of f t he hi gh
pr essur e pi pe
Normal suction of
the comressor low
pressure pipe
Charge t he
ni t r ogen t o t he
condenser pi pe
No air on the
low pressure side
Pi pe
cl ogged
Repl ace t he di rt y and
cl ogged par t s and
cl ean t he syst em pi pe
Little
frost
No air suction on
the compressor
low pressure pipe
Cut of f t he hi gh
pr essur e pi pe
Bad compression
of the compressor
Repl ace t he
compr essor
Leakage
checki ng
Detected
Leakage
poi nt
?
Cut of f t he
l ow pr eesur e pi pe
A little
refrigerant air
spurt out
Leaks
slowly
A little
refrigerant air
spurt out
Repai r t he wel di ng,
cl ean t he pi pe and
r epl ace t he dr y f i l t er
Vacuumi ng and
r echar gi ng
Leakage
check agai n
Big quantity
refrigerant air
spurt out
Cut of f t he hi gh
pr essur e pi pe
Normal suction of
the comressor low
pressure pipe
No air suction or weak
suction on the compressor
low pressure pipe
Compr essor
br eaks down
Repl ace t he
compr essor
Charge t he
ni t r ogen t o t he
condenser pi pe
Not sufficient nitrogen
air return back the low
pressure side
Pi pe i s
cl ogged
slightly
Repl ace t he di rt y and
cl ogged par t s and
cl ean t he syst em pi pe
Condensate dew
but no frost
Check t he hi gh
pr essur e si de pi pe
and compr essor
Too high
temperature
Check l ow
pr essur e pi pe
Frost
Too mor e
r ef r i ger ant
Frost
Rechar ge appropr i at e
quant i t y r ef r i ger ant
Cooling
discontinuously
Pi pe i s cl ogged
with ice
Repl ace t he dry f i l t er
and cl ean t he syst em
pi pe wi t h war m ni t rogen
Compressor
not working
Check t he el ect ri cal par t s such
as PTC st art er , capaci t or , over l oad
pr ot ect or , t her most at et c.
Broken-down
Repl ace t he
br oken- down par t s
Good
Measur e t he
r esi st ance of t he
compressor wi ndi ng
Abnormal
resistance
Normal
Repl ace t he
compressor
Over l oad
pr ot ect or act s
Over l ar ge
cur rent
Repl ace t he
compressor
Compr essor
goes wr ong
Yes
No
Problem and check point
Cause
Solution
9
Check the frost on the cabinet liner surface, if find like following:
1) No frost, then do the leakage detecting.
A). If the leakage point is found, then first cut off the low pressure pipe to discharge the left
refrigerant in the system, then clean the pipe, replace with a new dry filter and welding again,
again recharge the refrigerant and do the leakage detecting.
B). If the leakage can not be found, cut off the low pressure pipe, if there is no refrigerant
omitting, then recharge the refrigerant and do the leakage detecting again; If there is refrigerant
omitting, cut off the high pressure pipe(means that compressor suction is normal), charge the
condenser pipe with pressurized nitrogen, if no air at low pressure side, means the pipe is
blocked, then replace the blocked parts and clean the system pipe; If no air suction at compressor
low pressure side, cut off the high pressure pipe, means air compression of the compressor is not
good, please replace the compressor.
2). A little frost on the surface, also do the leakage detecting first.
A) If the leakage point is confirmed, then cut off the low pressure pipe, if a little
refrigerant air spurt out, means that the system leaks slowly on the leakage point, you should
repair the welding of cut pipe and the leakage point and clean the system pipe by the high
pressure nitrogen, replace the dry filter, after completion these work, re-vacuum and recharge the
refrigerant, at last do the leakage detecting again.
B). If big quantity refrigerant spurt out, cut off the high pressure pipe to check the suction of
the compressor low pressure pipe is normal or not: if no suction or weak suction, it means not
good compression and need to replace the compressor; if normal suction, then charge the clean
and warm nitrogen to the condenser pipe, if you find the returned nitrogen of the low pressure
side is not sufficient, it means that the system pipe is clogged lightly, please replace the clogged
parts and clean the pipe.
3). No frost, but have condensate water on the surface on the cabinet liner, check the temperature
of the high pressure side pipe and the compressor, you will find it is too high temperature and
check the low pressure pipe with frost, if like this, means too more refrigerant in the system,
please recharge with appropriate quantity refrigerant once more.
4) The unit works discontinuously, maybe the system is clogged with ice, please replace the dry
filter and clean the system with clean and warm nitrogen.
5) Compressor doesn’t run.
Please check the electrical parts, such as PTC starter, capacitor, overload protector, thermostat
etc., if you find the parts go wrong, then replace a new one with same type and specification. If
all of these parts are good, please measure the resistance of the compressor winding, if the
resistance is abnormal, must replace the compressor; otherwise check the overload protector act
or not, means the over large current and compressor goes wrong, also replace the compressor.
10
（九）、Table for quick answer for the field problem：
Item Phenomenon Check point and the detail Caused by
(A).
Not cool
completely
Power indicator is
not on and
compressor doesn’t
run
Check that other
appliances are
working or not.
No power
supply in
neighbor house
Field power
supply is cut off.
All of other
appliances in
house don’t
work
Main fuse is cut
off.
Only this freezer
doesn’t work
Power supply
outlet has
problem
Compressor
doesn’t run, but
power indicator is
on.
If the cooling thermostat is shorted of the
circuit or t
urn the thermostat to the
coldest point, the compressor can run.
Thermostat is
breakdown
There is sound when turning the knob of
the thermostat.
The knob is
broken or is not
installed
properly.
Thermal protector
may be overloaded.
Check it is
cutoff
or not by
the multi-meter.
If it is cutoff,
means it is
broken down.
PTC Starter
Check it is
cutoff or not by
the multi-meter.
If it is open,
means it is
broken down.
Check the circuit
wiring
Check it have
broken point or
not in the circuit
wiring according
the electrical
diagram
Maybe the lead
is broken or the
connection point
is loosing
Compressor problem
Measure the
winding
resistance of the
compressor
The winding is
broken or burnt
11
Measure the
insulation
resistance by
meg-
ohm meter,
if the insulation
resistance < 1
MΩ,the unit
can’t be used for
long time.
The winding is
burnt.
Power supply voltage
The voltage is
too low.
(Maybe lower
than 175V)
Compressor
can’t start
because of under
voltage.
Compressor can
run
Cooling system
There i
s no
sound of
refrigerant
flowing in
cooling system
and it leaves oil
on the welding
point
Leakage of
refrigerant
There is no
sound of
refrigerant
flowing in
cooling system
and no oil on the
welding point.
Inside leakage of
cooling pipe or
the pipe is
blocked.
Compressor
No air is
discharged out
on the
discharging
mouth of the
compressor.
Compressor
valve is
breakdown
There is
abnormal sound
inside
compressor
Compressor is
breakdown
(B)、
Compressor
Incorrect using
Check the thickness of frost(>5mm?)
The frost is too
thick
12
runs but
cooling
effect is not
good.
Thermostat is set at higher temperature
(lower digit)?
Set it to lower
temperature
There is too more food in cooling
compartment, too crowded, ensure good
air circulation inside freezer
Too more food
Is there high temperature food, like hot
soup etc., inside freezer?
Hot temperature
food let the
temperature
inside freezer
cooling
compartment
rise.
Too more times of opening of the door
It will affect the
cooling effect
Leak
age of
cooling air
Check the door gasket sealing strip is
broken or deforming
Broken of the
door gasket
sealing strip
Check the door is warded off by the food
and the door is closed tightly or not.
The door is not
closed tightly
The unit is not
placed
at good
position
The freezer is inside direct sunshine The unit can not
dissipate the heat
because sunshine
The back of the unit is too close to the
wall
Too close will
affect the heat
dissipation
There is heat source near the unit.
Over-hot
environment will
affect the heat
dissipation
(C)、
Temperature
is too low
Abnormal action
of thermostat
Check the sensor head of the thermostat
is loosing or not
Incorrect
temperature
sensing of
thermostat
Thermostat is not at good quality
Thermostat is
breakdown
(D)、
Water
condensate
There is
condensed water
on the closure
The environment is too wet
The relative
humidity is too
high
(E)、
Leakage
of
electricity
Electrical shock
sense on the
enclosure
Confirm the insulation resistance is lower
than 1 MΩ by the meg ohm meter
Insulation is not
good
Check the electrical parts of the unit are
wet
Insulation is not
good
13
Check the electrical parts touch with the
metal enclosure or not, and the grounding
lead is not grounded properly
Electricity
leakage
Check it have static electricity influence
Static electricity
influence
(F)、
Too noisy
and
vibration
There is sound
inside compressor
Check the compressor has abnormal
sound or not.
Compressor
abnormal
There is vibration
sound
Check the pipe is touched each other or
not
Pipe touching
produce
resonance
Check the installation ground is flat and
the feet is adjusted at proper position or
not
The unit is not
placed evenly
（十）、Note of the cooling system maintenance with R134a refrigerant：
一、The requirement of the cooling system parts：
Because refrigerant R134a and its lubricating oil grease is of strong water
absorbability and oxidation ability, and will cause catalysis reactivity with chloride to
produce impurity to be silt. So during service process, you should pay more attentions to
the water quantity, oxide quantity, chloride quantity, oil quantity and impurity quantity
in the cooling system, and control it more strictly.
·Left water quantity control：
1）If the cooling system parts, like condenser, evaporator, compressor, or the dry
filter etc., need to be replaced, the replaced parts should be stored charging with dry
nitrogen with pressure 0.2~0.3Mpa, and if these parts have leakage of nitrogen, they must
be dried in the high temperature chamber and be taken out of the water before using.
2） The molecular dry desiccant inside dry filter must be controlled strictly,
guaranteed that the left water quantity must be lower than 1.5WT%. And normally, after
the dry filter is opened from vacuum package, must be welded to the pipe system within
5 minutes. If at wet condition (relative humidity>50%), must take measure to be
protected from humidity, and the dry filter must be connected to the system pipe at once
after removing from package, so as to produce the sealing system.
二、The requirement of the service equipment：
①No need recycling equipment, except charging machine, if the equipment is special
for R134a refrigerant system, must mark it clearly to avoid use each other. (except
welding machine, pliers, electronic balance）
②The vacuum machine and charging machine are special used for R134a refrigerant
system.
三、Service Procedure：
14
Special requirement during service process：
(a). Duration of from opening of compressor to vacuuming process must be less than 10
minutes, and for other parts not more than 12 minutes.
(b)． Vacuuming duration should not loess than 20 minutes.
(c)． If refrigerant leakage happens, it need to replace the compressor. Before welding,
dry the cooling system by the nitrogen air.
(d)． If the dust blockage happens in cooling system pipe, if can be blow out by the
nitrogen, don’t need to replace the compressor, otherwise the cabinet is no useful
(and the evaporator is no useful).
(e)．If ice blockage happens in the system pipe, must replace the compressor.
f． Change the dry filter only if the system is opened.
四、Main point of service：
①The replaced compressor must return back to the compressor manufacturer to be
treated.
②The compressor can’t be tested through direct absorbing atmosphere, it will damage
the compressor.
③If the system pipe is opened for a long time or leakage happens, you can dry the
system by nitrogen during service.
④All of the welding material must be protected from wet condition. And ensure to use a
little as enough as possible.
⑤Check the compressor is pressurized or not when opening.
⑦When storing the R134a refrigerant, must keep it sealed and not touch with
atmosphere directly.
（十一）、The performance testing requirement after service:
After completing the service, normally need to be done test running for 1-2days. When
proved to be safely and good cooling performance, then move to the customer or user. During
test running, we suggest that you can do following item:
1、Insulation and safety：
Before plugging in, use the DC 500 meg-ohm meter to measure the insulation
resistance between the live parts and dead metal enclosure, ensure the result is not lower
than 1 meg-ohm.
2、Starting capability：
The compressor can start smoothly, and can start or stop normally. If the unit can’t
start or stop normally, must find the root cause and delete the cause, then you can
plugging it in to let it run.
3、Cooling performance：
After running for 24 hours, check that the frost on the surface of the cabinet linear is
oven or not, and there is no frost on the suction pipe.
4、Electrical structure and safety：
After service, check all of the electrical parts, ensure the connection terminal of
the electrical parts don’t loose and the grounding wire is ok.
15
5、Leakage checking：
After running for 24 hours, check one by one of welding point by using halogen
leakage detecting device or suds. If leakage happens again, then should service again.
（十二）、Maintenance parts list：
No. Parts name PCS/unit Note
1 Compressor 1
2
Thermal protector of
compressor
1
3
PTC starter
1
4 Feet of compressor 4
5 Refrigerant dry filter 1
6 Thermostat 1
7 Power cord assembly 1
8 Adjustable feet 1
9 Door gasket sealing strip 1
9 Running indicator 1 Green color
10 Power indicator 1 Red color
