hzb-15s service manual

20
Service Manual For Ice-Maker Contents Section1 Working Principle of Ice-making Section2 Getting to know you ice-maker Specification Brief Sketch Figure Explosion Drawing How to use your ice-maker Main parts of the ice-maker Control for the ice-maker Section3 Electric Diagram Schematic Diagram For PCB Electrical Wiring Diagram Section4 Maintenance Important Safety How to open the unit Some point should be checked Checking the cooling system Section5 Troubleshooting Normal Example Abnormal Breakdown Section6 Appendix

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Page 1: HZB-15S Service Manual

Service Manual For Ice-Maker

Contents Section1 Working Principle of Ice-making Section2 Getting to know you ice-maker Specification Brief Sketch Figure Explosion Drawing How to use your ice-maker Main parts of the ice-maker Control for the ice-maker Section3 Electric Diagram Schematic Diagram For PCB Electrical Wiring Diagram Section4 Maintenance Important Safety How to open the unit Some point should be checked Checking the cooling system Section5 Troubleshooting Normal Example Abnormal Breakdown Section6 Appendix

Page 2: HZB-15S Service Manual

SECTION 1 Working Principle of Ice-making Main process for the ice maker include “adding water”, “ice-producing”, “ice harvest” etc.

When the unit is started, first step is the working of the synchronous motor to move the ice case to the level position, then the water pump will start to pour water into the ice case. And after the ice case is full of the water, the compressor start to run. The compressor absorb the low pressure gas state refrigerant from the evaporator and compress it. After the compressing, the refrigerant get the more high pressure and more high temperature, then out of compressor and enter the condenser. The heat of the refrigerant dissipate through the condenser and the refrigerant itself change to be liquid state. The liquid refrigerant go through the drier filter, then enter the capillary. In the slim and long capillary, the pressure of the refrigerant decrease and the refrigerant change to the liquid completely, then go inside the evaporator again. The refrigerant in the evaporator absorb the heat around the surround and change to the gas, the temperature decrease and the refrigerant go into the compressor and to be compressed. The refrigerant cycles in the cooling system round and round like so, absorb the heat of the water in the ice case continuously, till once ice making process complete. Then the synchronous motor rotate to the vertical position to enter ice harvest process. Then the solenoid valve open, the refrigerant out of the compressor enter the evaporator directly through the solenoid valve, the heat of the high temperature and high pressure will be absorbed by the evaporator, make the temperature of the evaporator increase. Then the ice cube on the surface of the evaporator will melt quickly, and fall down, then the ice harvest process complete. Then the unit enter the new ice making process.

The following two diagrams show the refrigerant flowing in the cooling system.

Refrigerant Flowing Way

Condensor

High Temp,High PressureGas State

Low Temp,Low PressureGas StateRefrigerant

Flowing Way

Compressor

Principle Diagram for Ice-making process

Evaporator

Low temperature,Low pressure liquid state

Solenoid Valve for Ice harvest

Low Temperature,High PressureLiquid State

Capillary

Refrigerator Filter

Page 3: HZB-15S Service Manual

High Temp,High PressureGas State

Condensor

Refrigerant Flowing Way

Low Temp,Low PressureGas State

Compressor

Solenoid Valve for Ice harvest

Principle Diagram for Ice-harvest process

High temperature,High pressure Gas state

Evaporator

Refrigerant Flowing Way

Refrigerator Filter

Capillary

SECTION 2 Getting to know your ice-maker

A. Specification Model HZB-15 Power Supply 115V-120Vac/60Hz 220V-240Vac/50Hz Ice-making Input Rating 2.4A 1.2A Ice-harvest Input Rating 3.5A 2.3A Refrigerant R134a/130g Ra34a/120g Vesicant R141b Net Weight 21KG Dimension 435*380*431mm

B. Brief Sketch Figure

1. Cover: With a transparent window to allow interior visibility.

2. Control Panel: Easy to use, visible functions touch display setting.

A) Starts or stops ice making cycle.

Page 4: HZB-15S Service Manual

B) Selects ice cube size.

3. Water drain cap: For draining water from water

reservoir.

56

4

3

2

1

4. Ice basket.

5. Ice scoop.

6. Ice shovel.

C. Explosion Drawing

Page 5: HZB-15S Service Manual

273132 2930 28

1 2 3 4 5 6 7 8

2026 25 24 2223 21 1819

17

14

16

15

129 10 11 13

33

No. Parts Name Material Quantity Specification/Model/Note

1 Control Panel ABS 1

2 Display PCB Electric Parts

Assemble

1

3 Front Panel ABS 1

4 Inner Tank ABS 1

5 Handle ABS 2

6 Ice Shovel ABS 1

7 Ice Case ABS 1

8 Evaporator Copper Assembly 1

9 Up Water Inlet Pipe Stainless Steel 1

10 Back Shell for inner tank Sheet Metal 1

11 Installing plate for micro switch ABS 1

Page 6: HZB-15S Service Manual

12 Cover ABS 1

13 Left Side Panel ABS 1

14 Solenoid Valve Electrical Parts 1

15 Refrigerant Filter Copper Parts 1

16 Pressure Switch Electrical Parts 1

17 Container Of Refrigerant Copper parts 1

18 Back Board ABS 1

19 Strengthen Plate Sheet Metal 1

20 Cooling Fan Electrical Parts 1

21 Condenser Assembly 1

22 Water Pump Electrical Parts 1

23 Down Water pipe Silicon Tube 1

24 Adjustable Foot Rubber assembly 4

25 Compressor Assembly 1

26 Bottom Base Sheet Metal 1

27 Control Box Assembly 1 Main Control PCB inside

28 Water Drain Pipe Silicon Tube 1

29 Transformer Electrical Parts 1

30 Right Side Board ABS 1

31 Motor for ice shovel rotation Electrical Parts 1

32 Ice Basket Stainless steel/ABS 1

D. How to use your ice-maker

Operation Panel

Indicator for Smallestsize ice-cube

Indicator for Medium

Page 7: HZB-15S Service Manual

Button to select thesize of the ice cube.

Indicator for ice full

Indicator forLarge sizeice-cube

Indicator for nowater

ON/OFF button to startor stop the unit.

Explanation for indicator and button

Indicator for Smallest Size ice-cube:If you select this size of ice-cube, the size of the ice-cube is smallest and the duration time for one ice-making processing is shortest. (About 6min for ice-making+20s for ice harvest+50s for water pouring=7min 10s) Indicator for Medium Size ice-cube: If you select this size of ice-cube, the duration time for

one ice-making process is about 10min and 10 seconds. (About 9 min for ice-making+20S for ice harvest+50s for water pouring=10min 10s)

Indicator for Largest Size ice-cube: If you select this size of ice-cube, the duration time for one ice-making process is about 13min and 10 seconds. (About 12 min for ice-making+20s for ice harvest+50s for water pouring=13min 10s) “ICE” Indicator for ice full: When this light is on, means that the ice is full in ice basket. And

the unit will stop running. “ADD WATER” Indicator for no water: When this light is on, means that there is no water in

the unit. If you want more ice cube, add the water to the water tank of the unit. “SELECT” button:Use this button to select the size of the ice cube. You should select the appropriate size according to the room temperature. “Power” button: Use to start or stop the unit. Note: Because of the different room temperature, for the same selected size of the ice cube, the actual size of ice cube maybe is different.

After you plug on the unit, and pour the water into the water tank of the unit, then press

“Power” button to start the unit. If you want to select the size of the ice cube, the press the “Select” button.

Description of ice making process

After pressing the “Power” button, the ice case will rotate upward, empty the water out. After 20 seconds, the ice case will rotate downward again and be level position. Then water pump start to work for about 50 seconds to fill the water into the ice case. After 50 seconds, the water pump stop working and compressor start to work at once to enter ice making process. After 6 min(for

Page 8: HZB-15S Service Manual

small size of ice cube), 9 min(for medium size) or 12 min (for large size ), one ice making process is completed. After this, the ice case will rotate upward, empty the surplus water, at same time, the ice harvest solenoid start to work, it will work for about 20 seconds. Then ice harvest process finish, the ice harvest solenoid stop working. And ice case start to rotate downward again, at same time, ice shovel moves to push ice cube to the ice basket. The ice case is at level position again and start to pour the water again. The second ice making process start again. During these process, the compressor will always work and not stop.

Operation Procedure 1. Open the cover, remove the ice basket and pour water into tank.

Keep water level below the level mark. 2. Press “Power” on the control panel to begin the ice making cycle. 3. Select the size of the ice cube by pressing the “Select” button. If the room temperature is

lower than 60℉, it is recommended to select the small or medium ice sign button in order to avoid ice cube sticking together.

4. The ice making cycle lasts about 7 to 13 minutes, depending on the size of the ice cube selection.

5. While the ice maker is on, verify water level periodically. If water pump can’t inject water, the ice maker will stop automatically, and the “Water” indicator will be on. Press “Power” button, fill water up to the level mark and press “Power” again. Allow the refrigerant liquid inside the compressor at least 3 minutes to settle before restarting.

6. The ice maker automatically stops working when the ice basket is full. 7. Change water in the water reservoir every 24 hours to ensure a reasonable hygiene level.

If unit isn’t in use, drain all water left in the water tank

E. The main parts of the ice-maker I. Evaporator

Page 9: HZB-15S Service Manual

This is the main parts to make the ice cube. And during the ice-making process, it is the low pressure component; during the ice-harvest process, it is the high pressure component. It is very important that the evaporator must be installed level, otherwise the produced ice cube will be different size, and if more severely, it will obstruct the ice case and the unit will not work.

II. Condenser

The condenser is a high pressure component, it transfers heat power of high pressure, high temperature refrigerant gas coming from compressor to air around it through its outer wall and wing plate. In our ice-maker, it is cooled by the fan.

III. Compressor

This compressor belongs to piston type. Compressor is the heart of A/C refrigeration system. Flow or circulation of refrigeration for this system is depending on running of compressor. Model No.: OF789D AZ1335Y-1 for 115V/60Hz

Page 10: HZB-15S Service Manual

OF1033A for 220~240V/50Hz The motor of the compressor is the PTC starting single phase asynchronous motor with external overload thermal protector. The following diagram shows the electrical connecting way for the compressor:

Power Supply

Comp SM

Overload Protector

C

3

21 PTC Startor

To check the compressor is good or breakdown, remove the PTC startor and overload thermal protector, use the multi-function meter or resistance meter to measure the the resistant of main coil (between M terminal and C terminal) and secondary coil(between S terminal and C terminal), if the resistance is zero or infinite, then the compressor is breakdown. Normal the resistance is about several hundred or ten ohms. And at the normal temperature, the overload protector is not open and the resistance of the PTC startor is several ohms.

IV. Fan Motor for condenser

This type of the motor of the fan is synchronous motor impedance protected. Model No.: SP100A, P/N: 1123XSL for 110-120Vac/60Hz SP100A, P/N:2123XSL for 220-240Vac/50Hz

V. Pressure Switch (Optional) This is the low pressure protection switch. When the pressure in the cooling system is high than 1.25Mpa, the it will close and the fan motor will start to work to dissipate the heat inside the condenser. And the pressure lows down with the fan working, this low pressure switch will open again.

VI. Motor for ice shovel rotation

Page 11: HZB-15S Service Manual

This also is the synchronous type motor with impedance protected. The speed is about 3.5RPM for 50Hz power and 4.1RPM for 60Hz. This motor is to move and rotate the ice case, so the torque is very important.

VII. Solenoid Valve It is very simple, you can measure the resistance of the coil to check it is ok or not.

VIII. Water pump

IX. Refrigerant Filter

This filter is located between the condenser and capillary. Its main function is to eliminate the dust and humid in the cooling system. Purpose is to avoid obstructing of capillary and maintain the good cooling result.

X. Transformer Transformer used in this unit belongs to class 2 transformer or isolation transformer, and

is thermal fuse protected. Model: JPT44-77 for 115V,60Hz, Primary:110-120Vac, Secondary:10.5V,350mA

WJ-41105300A1 for 220-240V/50Hz,60Hz, Primary:220-240V, Secondary:10.5V,350mA

Page 12: HZB-15S Service Manual

F. Control for the ice-maker I. Ice-making control

When selected for the size of the ice cube, each ice-making time is controlled by the microcomputer of the main controller and is invariable. So if the room temperature is different, for the same selected size of the ice cube, the actual size maybe is different.

II. Water Control When the water pump start to work, after 3 seconds, if the stainless steel tube and stainless piece on the water out mouth underneath the top cover can’t remain be shorted for 3 seconds, then the main controller will confirm that there is not enough water in the water tank to make the ice again. And the add water indicator on the front panel will lit on. And on the contrary, if the stainless steel tube and stainless piece on the water out mouth underneath the top cover always be shorted, and actually there is no enough water on the water tank, so it will not tell there is no water. And the unit will work continuously but can’t produce the ice.

III. Ice-cube full control To detect the ice is full or not in the ice basket, the main controller will detect the temperature of the sensor on the up edge of the ice basket. If the temperature attain below or equal about 4.5 centigrade, means the ice basket is full of the ice cube. And the unit will stop working and the indicator of ice full on the operation panel will lit on. If the temperature is rising again, the unit will start again automatically and the indicator of the ice full will be off.

IV. Fan control

The fan is controlled by the pressure protection switch. If the pressure of the cooling system is above 1.25Mpa, then the fan will start to work. And if the pressure of the cooling system is down and lower than 0.8Mpa, the fan will stop at once. This is to keep the condenser cool and maintain the ice making effect. Note: In future will use another sensor to control the fan motor. The sensor is put on the condenser. If the temperature of the sensor is higher than 35 centigrade, the fan will start to work. And if the temperature of sensor of low again and is lower than 32 centigrade, the fan will stop at once.

V. Compressor Control During the ice-making and ice-harvest process, the compressor will always run and not stop. When there is no water in the water tank and the ice basket is full of the ice cube, the whole unit will stop working and the compressor also stop running. If the compressor want to restart again, it must be after 3 minutes of the compressor stop.

SECTION 3 Electrical Diagram

A. Schematic Diagram For PCB

Page 13: HZB-15S Service Manual
Page 14: HZB-15S Service Manual

B. Electrical Wiring Diagram

MCU

OPERATION PCB

MAIN CONTROL PCB

LEDLEDPower Button

Select Putton

SLED

LED

LED

7C

MLED

SENSOR FOR ICE DETECTING

T1

AC-L

AC-N

PRESSURE SWITCH

N FAN MOTORPOWER

SUPPLYLG

P

Black

ELECTRICAL DIAGRAM FOR ICE-MAKER

Black

Yellow

WATER DETECTING SWITCH

MICRO SWITCH

MICRO SWITCH

RelayRelay

COMPPUMP

RelayRelay

MOTORVALVE

Motor For Ice shovel rotation

Black Solenoid Valve For Ice-melting

BlackOverload Protector

C Black

CompM S WATER PUMP

3

Blue

Red

SM

WhitePTC Startor 1 2 Blue White

SECTION 4. MAINTENANCE

A. Important Safety

When using electrical appliances, basic safety precautions should be followed to reduce the risk of fire, electric shock, and injury to persons or property. Read all instructions before using any appliance.

Do not operate this or any other appliance with a damaged cord. Connect to properly polarized outlets only. No other appliance should be plugged into the same outlet. Be sure that the plug is fully inserted into the receptacle.

Do not run cord over carpeting or other heat insulators. Do not cover the cord. Keep cord away from traffic areas, and do not submerge in water.

We do not recommend the use of an extension cord, as it may overheat and become a risk of

Page 15: HZB-15S Service Manual

fire. If you must use an extension cord, use No.14 AWG minimum size and rated no less than 1875 watts.

Unplug the ice maker before cleaning or making repairs.

Exercise caution and use reasonable supervision when appliance is used near children.

Do not clean your ice maker with flammable fluids. The fumes can create a fire hazard or explosion.

Do not tip over.

If the ice maker is brought in from outside in wintertime, give it a few hours to warm up to room temperature before plugging it in.

Page 16: HZB-15S Service Manual

B. How to open the unit 1). Remove the back panel first

Unscrew the screw on the bottom and back of the back panel of the unit, then slide the back panel down. 2). Remove the right and left side panel

Unscrew the screw on the bottom of these two sides panel, then slide it down. After you remove the back panel and side panel, you can see the compressor, pressure protection switch, condenser fan, solenoid valve, micro switch, synchronous motor for rotation of ice case, condenser, drier filter, and control box.

3). Remove the cover of the mail control box.

Page 17: HZB-15S Service Manual

These figure shows the cover is removed. After removing the cover of the main control box, you can check the main control is working good or not. You can measure the output of each electrical parts. If the main control’s output is normal, then the problem is at the electrical parts itself.

4). Remove the top cover Unscrew the underneath screw of right and left side of the top cover.

After removing the top cover, you can check the water detecting parts, the stainless steel tube and stainless piece on the water out showed in above right figure is ok or not.

C. Some point should be checked when maintenance 1) Check the water filter in bottom of the water tank for one or two month. If your water is not so very clean or something is left in the water tank, then the water filter

will be obstructed and the unit will not work normally. 2) The drain cap should be tightened. If the drain cap on the left side of the unit is not tightened completely, it will cause the

water leakage. And if the water leakage produce, you should check each of the connecting point of water flowing way.

3) The micro switch should be installed correctly. It is very important that one should be exact horizontal and another should be exact vertical. These two micro switch is used to detect the position of the ice case. 4) When cleaning, you should not touch the sensor on the top edge of the ice basket. It is used to detect if the ice basket is full of the ice cube or not. So make sure not to touch

and move it. Otherwise the unit will not work normally. 5) Leave enough space on the two sides and the back of the unit. Keep airflow free. And there is no obstruct substance block the air inlet and outlet of the

unit.

D. Checking the cooling system 1).After long time using, make sure the surface of the condenser clean. 2).There is no refrigerant leakage in the cooling system.

SECTION 5. Troubleshooting

A. Normal Example

Page 18: HZB-15S Service Manual

B. Abnormal Breakdown

Problem Possible Cause Solution Maybe the stainless steel tube and the stainless piece on the water outlet is shorted. So the controller can’t find there is no water in the unit.

Open the cover of the unit, check it and make sure that the up water inlet pipe does not contact with the stainless steel piece underneath of top cover.

There is no water in the unit, but the unit is still making ice and will not stop

Maybe the two pin of water detect plug on the PCB is shorted

Check the pcb.

Maybe the lead of the water detecting is broken.

Check the lead, and change a new one.

Maybe plug on the PCB is broken.

Check it.

There are enough water in the water tank, but the indicator of “add water” lit on and the unit stop working.

Maybe the water pump is breakdown.

Check it and change to a new one.

PROBLEM POSSIBLE CAUSE SOLUTION

“Water” indicator is on. Lack of Water. Stop the ice maker, fill water, and then restart it.

“Ice” indicator is on. There is too much ice. Remove ice from ice basket.

“Water” and “Ice” indicator are both flash.

Ice shovel can not move. Check if the ice is blocking the ice shovel, otherwise, consult a certified technician.

The ice cycle is too long. Stop the ice maker, and restart it when the ice blocks melt. Select the small ice button.

Ice cubes stick together. Water temperature in inner tank is too low.

Change the water in the inner Tank. Temperature of water is better set between 45℉-90℉ .

Ambient temperature or water temperature in inner tank is too high.

Please run the ice maker below 90℉and pour colder water into tank.

Refrigerant liquid leakage. Verify by a qualified technician. Ice making cycle is normal but no ice is made.

Pipe in the cooling system is blocked.

Verify by a qualified technician.

Page 19: HZB-15S Service Manual

Maybe the water filter on the bottom of the water tank is blocked.

Remove the water filter and clean it, the reinstall back.

Maybe somewhere of the water flowing way is obstructed.

Check it, remove the obstruct substance.

Maybe the ice case is not level Open the top cover, adjust the ice case to level position.

If the ice case is level, maybe the micro switch is installed incorrectly.

Remove the left side panel, check the micro switch position.

During one ice-making process, some ice cube are very small, some ice-cube are normal

May the unit is too hot. Check the fan motor is work or not. Don’t let the condenser too hot, otherwise the cooling will not work normal.

Maybe the synchronous motor is breakdown.

Change another motor. The ice case can’t move to the correct position.

Maybe something obstruct the ice case.

Remove obstruct.

May the room temperature is , like 10 centigrade. too low

It is too low, normally people will not let the unit work to produce the ice cube. If you want so, move the unit to a little high temperature environment.

There is no enough ice cube in the ice basket, but the indicator of ice full lit on.

Maybe the ice cube touch the sensor occasionally when the ice case push the ice cube into the ice basket.

Remove the ice cube, wait for some minutes to let the unit restart again.

SECTION6 Appendix I. Sensor for detecting ice-full

Resistor(KΩ)——Temperature(℃) Specification: R25=10.0KΩ±1.0%

B25-50=3470K±1.0% T(℃) R(KΩ) T(℃) R(KΩ) T(℃) R(KΩ) T(℃) R(KΩ) T(℃) R(KΩ) -20.0 74.506 9.0 19.143 38.0 6.164 67.0 2.350 96.0 1.013 -19.0 70.874 10.0 18.345 39.0 5.948 68.0 2.279 97.0 0.955 -18.0 67.352 11.0 17.588 40.0 5.740 69.0 2.210 98.0 0.950 -17.0 64.025 12.0 16.865 41.0 5.541 70.0 2.143 99.0 0.934 -16.0 60.883 13.0 16.176 42.0 5.349 71.0 2.070 100.0 0.909 -15.0 57.913 14.0 15.519 43.0 5.165 72.0 2.017 101.0 0.885

Page 20: HZB-15S Service Manual

-14.0 55.107 15.0 14.893 44.0 4.989 73.0 1.957 102.0 0.862 -13.0 52.454 16.0 14.296 45.0 4.819 74.0 1.899 103.0 0.839 -12.0 49.944 17.0 13.726 46.0 4.656 75.0 1.843 104.0 0.817 -11.0 47.569 18.0 13.182 47.0 4.499 76.0 1.789 105.0 0.796 -10.0 45.322 19.0 12.663 48.0 4.348 77.0 1.737 106.0 0.775 -9.0 43.195 20.0 12.167 49.0 4.204 78.0 1.687 107.0 0.755 -8.0 41.181 21.0 11.693 50.0 4.064 79.0 1.638 108.0 0.736 -7.0 39.272 22.0 11.241 51.0 3.930 80.0 1.591 109.0 0.717 -6.0 37.464 23.0 10.808 52.0 3.801 81.0 1.545 110.0 0.698 -5.0 35.730 24.0 10.395 53.0 3.677 82.0 1.501 111.0 0.681 -4.0 34.125 25.0 10.000 54.0 3.558 83.0 1.458 112.0 0.663 -3.0 32.584 26.0 9.522 55.0 3.443 84.0 1.417 113.0 0.647 -2.0 31.121 27.0 9.261 56.0 3.332 85.0 1.377 114.0 0.630 -1.0 29.734 28.0 8.915 57.0 3.225 86.0 1.338 115.0 0.614 0.0 28.415 29.0 8.583 58.0 3.123 87.0 1.301 116.0 0.599 1.0 27.165 30.0 8.266 59.0 3.024 88.0 1.265 117.0 0.584 2.0 25.976 31.0 7.963 60.0 2.928 89.0 1.230 118.0 0.570 3.0 24.847 32.0 7.572 61.0 2.836 90.0 1.196 119.0 0.555 4.0 23.773 33.0 7.393 62.0 2.748 91.0 1.163 120.0 0.542 5.0 22.753 34.0 7.127 63.0 2.652 92.0 1.131 6.0 21.782 35.0 6.871 64.0 2.580 93.0 1.100 7.0 20.858 36.0 6.625 65.0 2.501 94.0 1.070 8.0 19.980 37.0 6.390 66.0 2.424 95.0 1.041