PREMIUM PRF3X (01) PDF DOCUMENT

Model	Door	Gasket seal for the door	Hinge	Accessory	Structure
PRF047XW PRF071XW	Integrated Foaming Door with painting sheet metal and simple, beautiful recessed handle	Recessed door gasket seal, easy to be discharged and cleaned.	Plastic material, simple and practically	One shelf and one drip tray inside	Front, Left and right side shell compose to whole “U” shape shell, with aluminum internal tank with cotton ginning, and unitary plastic linear mouth. It has inside hidden evaporator and condenser, and unitary foaming insulation.

No.	Model	PRF047XW	PRF071XW/PRF3X-3XT
1	Net Capacity (L)	47	71
2	Voltage (V)	115	115
3	Frequency (Hz)	60	50
4	Refrigerant	R134a	R134a
5	Refrigerant Amount (g)	38g	45g

In order to be safe during maintenance, you must obey the following basic attention:

1) During service:

Pay attention to the flame or ignition nearby, particularly after welding using gas too, must turn off the flame first, then can do other maintenance work, because the refrigerant will produce toxic air when it touches flame, sparkle or capacitor.

Do not do the welding work in an airtight or bad air circulation room.

When discharging the refrigerant, must keep the room in 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 with maintenance, you must first unplug the freezer to ensure safety.

3) Avoid electrical shock:

Normally when proceeding with maintenance, you must open the power supply first. But if you must check the field wiring or the component of the unit with the power supply on, you must be very careful and don’t touch the live parts. If you find out the wiring is aged, please replace it in time.

4) Correct use of the components:

If the component is damaged and needs to be replaced, be sure to replace it with a component of the same model. Do not use other models or other brand components, and do not use a changed component.

5) Correct use of the service tools:

Ensure to use the appropriate service tool correctly. Otherwise, it will cause bad electrical contact or loose fixing, and the incidence will happen.

6) Wiring connection:

When re-connecting the cut wire, be sure to use a soldering method or terminal connection, and then wrap the connection point with insulation tape to ensure a good connection.

7) Insulation resistance measure:

After completing the service and assembly, you must use the multi-meter to measure the insulation resistance. If it is greater than 1 million ohm, then you can plug in 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 performing maintenance, don’t let the child or infant be nearby.

10) Cleaning:

After service, do the necessary cleaning work and tell the customer the necessary precautions.

Please note, maybe some units are without a RUNNING CAPACITOR, according to the used compressor model.

No.	Parts Name	PRF047XW	PRF071XW/PRF3X-3XT
1	Door	1	1
2	Hinge	2	2
3	Shelf	1	2
4	Freezer Cabinet	1	1
5	Thermostat cover	1	1
6	Compressor base	1	1
7	Condensate Water Drain cap	1	1
8	Fixing feet	2	2

When replacing components, you must unplug the unit first to be safe.

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 the same model, and reinstall back the whole thermostat box with the 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 liner, then install the new gasket seal into the four sides of the groove, install it as evenly as possible, open and close the door several times to ensure that the door is sealed.

4) Replace the compressor:

(a) 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.

(b) 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, charge the correct amount of refrigerant into the system from the low pressure side pipe. After this, run the unit to check if the cooling performance is ok or not, then weld and close the technical pipe.

If there is no frost, 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 cannot 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 the low pressure side, it means the pipe is blocked, then replace the blocked parts and clean the system pipe. If there is no air suction at the compressor low pressure side, cut off the high pressure pipe, it means air compression of the compressor is not good, please replace the compressor.

If there is 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 spurts out, it means that the system leaks slowly on the leakage point. You should repair the welding of the cut pipe and the leakage point and clean the system pipe with high pressure nitrogen, replace the dry filter. After completion of this work, re-vacuum and recharge the refrigerant, and at last, do the leakage detecting again.

B) If a big quantity of refrigerant spurts out, cut off the high pressure pipe to check if the suction of the compressor low pressure pipe is normal or not: if no suction or weak suction, it means not good compression and you need to replace the compressor. If there is 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.

Check the temperature of the high pressure side pipe and the compressor. You will find it is too high, and if you check the low pressure pipe with frost, it means there is too much refrigerant in the system. Please recharge with an appropriate quantity of refrigerant once more.

If 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.

Please check the electrical parts, such as PTC starter, capacitor, overload protector, thermostat etc. If you find the parts are wrong, then replace them with a new one of the same type and specification. If all of these parts are good, please measure the resistance of the compressor winding. If the resistance is abnormal, you must replace the compressor. Otherwise, check if the overload protector acts or not. If it does, it means there is an over large current and the compressor is faulty, so you should also replace the compressor.

Check if other appliances in the house are working or not.

If there is no power supply in the neighbor’s house, the field power supply may be cut off.

If all other appliances in the house don’t work, the main fuse may be cut off.

If only this freezer doesn’t work, the power supply outlet has a problem.

Thermostat: If the cooling thermostat is shorted of the circuit or if you turn the thermostat to the coldest point, the compressor can run, which indicates a thermostat breakdown. Also, if there is a sound when turning the knob, but the compressor doesn’t start, the knob may be broken or not installed properly.

Thermal Protector: Check if the thermal protector is cutoff using a multi-meter. If it is cutoff, it is broken down.

PTC Starter: Check if the PTC Starter is cutoff or not by the multi-meter. If it is open, it is broken down.

Wiring: Check the circuit wiring according to the electrical diagram. There may be a broken point in the circuit, or a connection point may be loose.

Compressor Problem: Measure the winding resistance of the compressor. If the winding is broken or burnt, it needs replacement. Also, measure the insulation resistance with a meg-ohm meter. If the insulation resistance is less than 1 MΩ, the unit can’t be used for a long time as the winding is burnt.

Power Supply Voltage: If the voltage is too low (maybe lower than 175V), the compressor can’t start because of undervoltage.

Cooling System: If there is no sound of refrigerant flowing and it leaves oil on the welding point, there is a leakage of refrigerant. If there is no sound of refrigerant flowing and no oil on the welding point, there is an inside leakage of the cooling pipe or the pipe is blocked.

Compressor: If no air is discharged out on the discharging mouth of the compressor, the compressor valve is broken down. If there is an abnormal sound inside the compressor, the compressor is broken down.

Incorrect Using: Check the thickness of frost. If it is thicker than 5mm, the frost is too thick and should be defrosted.

Thermostat Setting: If the thermostat is set at a higher temperature (lower digit), set it to a lower temperature.

Food Load: If there is too much food in the cooling compartment or it is too crowded, ensure good air circulation inside the freezer.

Hot Food: If there is high-temperature food, like hot soup etc., inside the freezer, it will let the temperature inside the cooling compartment rise.

Door Opening: Opening the door too many times will affect the cooling effect.

Door Gasket: Check if the door gasket sealing strip is broken or deforming. Also, check if the door is warped by food and if the door is closed tightly or not.

Unit Placement: If the freezer is in direct sunshine, it cannot dissipate heat because of the sunshine. If the back of the unit is too close to the wall, it will affect heat dissipation. If there is a heat source near the unit, the over-hot environment will affect heat dissipation.

This may be due to an abnormal action of the thermostat.

Check if the sensor head of the thermostat is loosening or not. This can cause incorrect temperature sensing.

The thermostat may not be of good quality, leading to a breakdown.

If there is condensed water on the closure, it means the environment is too wet and the relative humidity is too high.

Confirm if the insulation resistance is lower than 1 MΩ by the meg-ohm meter. If so, the insulation is not good.

Check if the electrical parts of the unit are wet. If they are, the insulation is not good.

Check if the electrical parts touch the metal enclosure or not, and if the grounding lead is not grounded properly. This can cause an electricity leakage.

Check if it has a static electricity influence, which can feel like a shock.

If there is sound inside the compressor, check if the compressor has abnormal sound or not. This could mean the compressor is abnormal.

If there is vibration sound, check if a pipe is touching another or not. Pipes touching can produce resonance.

Check if the installation ground is flat and the feet are adjusted at the proper position. The unit may not be placed evenly.

1) The requirement of the cooling system parts:

Because refrigerant R134a and its lubricating oil grease are of strong water absorbability and oxidation ability, and will cause catalysis reactivity with chloride to produce impurity to be silt, you should pay more attention 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:

a) If the cooling system parts, like condenser, evaporator, compressor, or the dry filter etc., need to be replaced, the replaced parts should be stored charged with dry nitrogen with pressure 0.2~0.3Mpa. If these parts have a leakage of nitrogen, they must be dried in the high-temperature chamber and be taken out of the water before using.

b) The molecular dry desiccant inside the dry filter must be controlled strictly, guaranteed that the left water quantity must be lower than 1.5WT%. Normally, after the dry filter is opened from its vacuum package, it must be welded to the pipe system within 5 minutes. If in a wet condition (relative humidity >50%), you must take measures to protect it from humidity, and the dry filter must be connected to the system pipe at once after removing from the package to produce the sealing system.

2) The requirement of the service equipment:

① No need for recycling equipment, except a charging machine. If the equipment is special for the R134a refrigerant system, you must mark it clearly to avoid using it for other purposes (except welding machine, pliers, electronic balance).

② The vacuum machine and charging machine are special and used for the R134a refrigerant system.

3) Service Procedure:

Special requirement during service process:

(a). Duration from opening of the compressor to the vacuuming process must be less than 10 minutes, and for other parts not more than 12 minutes.

(b). Vacuuming duration should not be less than 20 minutes.

(c). If refrigerant leakage happens, it needs to replace the compressor. Before welding, dry the cooling system with nitrogen air.

(d). If a dust blockage happens in the cooling system pipe, if it can be blown out by nitrogen, you don’t need to replace the compressor; otherwise, the cabinet is not useful (and the evaporator is not useful).

(e). If an ice blockage happens in the system pipe, you must replace the compressor.

f. Change the dry filter only if the system is opened.

4) Main point of service:

① The replaced compressor must be returned to the compressor manufacturer to be treated.

② The compressor can’t be tested through direct absorbing atmosphere; it will damage the compressor.

③ If the system pipe is opened for a long time or leakage happens, you can dry the system by nitrogen during service.

④ All of the welding material must be protected from wet conditions. And ensure to use as little as possible.

⑤ Check if the compressor is pressurized or not when opening.

⑦ When storing the R134a refrigerant, you must keep it sealed and not in direct contact with the atmosphere.

After completing the service, it normally needs to be test run for 1-2 days. When proved to be safe and have good cooling performance, then move to the customer or user. During the test run, we suggest that you do the following items:

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, you must find the root cause and delete the cause, then you can plug 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 even 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 terminals of the electrical parts don’t loosen and the grounding wire is ok.

5) Leakage checking:

After running for 24 hours, check one by one of the welding points by using a halogen leakage detecting device or suds. If leakage happens again, then service should be performed again.

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	4
9	Door gasket sealing strip	1
9	Running indicator	0
10	Power indicator	0