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Product Name:THPKB-E1 Air Conditioner/Refrigerator Refrigeration & Heating Training System
Product Series:Household Appliance Training Series
Product Introduction

Technical description
    The THPKB-E1 air conditioner/refrigerator refrigeration & heating training system is designed with concept of Competence Based Education (CBE). It is recommended for the education of refrigeration technology, refrigeration fluid machinery, maintenance of refrigeration equipment, etc. Also, it is ideal equipment for bringing up person with ability of upgrade, design, installation, commissioning, maintenance, and management of air conditioning and refrigerating system.
    Features:
    (1) Combines simulated air conditioner and refrigerator, and provides actual refrigeration unit.
    (2) Both air conditioning system and direct/indirect cooling refrigerator system are available, satisfying the examination requirements for air conditioners and refrigerators.
    (3) Integrates refrigeration system of air conditioning and refrigerator, electrical control system, and fault insertion system.
    (4) Clearly shows inner components layout and refrigerating cycle system structure, demonstrates operating principle of a heat pump type air conditioner; comes with AC voltmeter, AC ammeter, thermometer, vacuumatic pressure gauge, pilot lamps, and LEDs to show the system real-time status; sight glasses are equipped for observing the refrigerant's state; high-pressure pipelines are marked with red color while low-pressure pipelines with green.
    (5) Fault insertion function, facilitating examination of students' skills.
Specifications
    (1) Power supply: single-phase three-wire AC 220V±10% 50Hz
    (2) Power capacity: <1.2kVA
    (3) Dimensions: 1580×730×1700mm
    (4) Refrigerant: air conditioner R22, refrigerator 600 a
    (5) Safety protection: current type and voltage type earth-leakage protections
Hands-on exercises
    Junior mechanic skills training
    (1) Basic operation of special tools  in refrigeration system
    (2) Pipe welding of refrigeration system
    (3) Leak hunting of refrigeration system
    (4) Vacuumizing and refrigerant charging of refrigeration system
    Intermediate mechanic skills training (design, installation, commissioning, examine and repair)
    (1) Commissioning of air-conditioning system
    (2) Commissioning of direct cooling refrigerator
    (3) Commissioning of indirect cooling refrigerator
    (4) Malfunction of refrigerator refrigeration system
    (5) Malfunction of air conditioning refrigeration system
    (6) Troubleshooting for refrigerator
    (7) Troubleshooting for air conditioner
System configuration
    The training system consists of power control panel, workbench, fault insertion box, test box, etc.
    (1) PKB-01 power control panel
    Iron with high density plastic-sprayed construction is adopted for this control panel with aluminum faceplate, it provides AC power supplies, various measuring instruments, and necessary devices:
    1) ac supply control unit: single-phase three-wire 220 V supplied, two AC voltmeter with measuring range of 0~250V to monitor the grid voltage, two AC ammeters with ranges of 0~5A and 0~10 A to monitor the system start current and operating current, a RCCB and a key switch to control the power supply to the control panel.
    2) Pressure detection unit: offers four vacuum gauges, measuring ranges -0.1~3.5MPa , -0.1~1.5MPa, used to monitor pressures at high-pressure and low-pressure sides respectively.
    3) Temperature detection unit: provides two digital thermometers ( -digit display).
    4) A set of current type leakage protection: it will be activated to cut off the power supply once the earth-leakage current exceeds a certain value, also a thermal protection device is available to protect the compressor against overthermal and overload.
    (2) PKB-02 workbench
Iron with high density plastic-sprayed construction is adopted for the workbench whose surface is fireproof, waterproof, and wear resistant, the design of drawers facilitates storing wires and facilities. It is moveable with integrated multi-direction lockable castors.
    (3) Fault insertion box
    This system provides two fault insertion boxes, one (with 21 fault inserting switches) for simulating air conditioning faults, another (with 18 fault inserting switches) for refrigerator faults; fault types: power circuit, temperature sensing circuit, drive circuit, compressor protection circuit, indoor fan speed control circuit, etc.
    (4) Test box
    The test box is designed for measurement, analysis, and troubleshooting for electrical system of air conditioner, direct cooling refrigerator, and indirect cooling refrigerator.
Fault description
    (1) Faults in a heat pump split air conditioner:


No.

Fault description

Symptom

K1

Primary side of transformer T open circuited

The function board is not electrified, and the complete system is out of operation

K2

Secondary side of transformer T open circuited

The function board is not electrified, and the complete system is out of operation

K3

Bridge rectifier open circuited

The function board is not electrified, and the complete system is out of operation

K4

7805 voltage regulator open circuited

+ 5V voltage is not output, the complete system is out of operation

K5

Indoor temperature transducer open circuited

"Run" indicator flashes

K6

Indoor temperature transducer short circuited

"Run" indicator flashes

K7

Indoor tube temperature transducer open circuited

"Timing" indicator flashes

K8

Indoor tube temperature transducer short circuited

"Timing" indicator flashes

K9

F1 start capacity open circuited

The motor is unable to start

K10

F1 running winding open circuited

The motor is unable to start

K11

YV coil of four-way valve open circuited

Four-way valve is out of operation, and is malfunction at heating condition

K12

Protective relay SAT open circuited

Compressor is out of run

K13

Compressor's start-up winding CS open circuited

Compressor is out of run, pickup current is exorbitant

K15

Buzzer' coil open circuited

Buzzer is unable to alarm, but the remote control takes effect

K14

Compressor's running winding CM open circuited

Compressor is out of run, pickup current is exorbitant

K16

Relay RLY5's loop open circuited

"High speed" is malfunction when simulating the indoor fan speed control

K17

Relay RLY4's loop open circuited

"Middle speed" is malfunction when simulating the indoor fan speed control

K18

Relay RLY3's loop open circuited

"Low speed" is malfunction when simulating the indoor fan speed control

K19

Relay RLY2's loop open circuited

Valve body of four-way valve is failure to actuate

K20

Relay RLY1's loop open circuited

Compressor is out of run

K21

Power terminal of infrared receiving tube open circuited

Remote control is out of function

K22, K23, K24

Backup

 

    (2) Faults in a direct cooling/indirect cooling refrigerator
 

No.

Fault description

Symptom

K1

Refrigerator door switch S2 open circuited

Fan motor doesn't operate at indirect cooling mode

K2

Refrigerator door switch S2 short circuited

Fan motor keeps operating when the door switch is turned on or off at indirect cooling mode

K3

Fan motor coil open circuited

Fan motor doesn't operate

K4

Terminals L-C of WPF temperature controller open circuited

Door lamp lights up but the compressor is not working at indirect cooling mode

K5

Terminals BW-BK of timer relay open circuited

Door lamp lights up but the compressor is not working at indirect cooling mode

K6

Terminals BW-BK of timer relay short circuited

Defrosting compressor keeps working after a continuous operating of 8 hours at indirect cooling mode

K7

Defrost thermostat open circuited

Defrost fuse blows when defrosting at indirect cooling mode

K8

Defrost electric heater open circuited

Defrost is out of service at indirect cooling mode

K9

Door lamp open circuited

Door lamp keeps off

K10

Refrigerator door switch S1 open circuited

Door lamp keeps off

K11

Refrigerator door switch S1 short circuited

Door lamp keeps on when the refrigerator door is turned on or off

K12

Protective relay open circuited

Compressor is unable to start, and no current display

K13

Compressor's start-up winding CS open circuited

Compressor is unable to start, and pickup current is exorbitant (approximately 5~10 times of compressor operating current)

K14

Compressor's running winding CM open circuited

Compressor is unable to start, and pickup current is exorbitant (approximately 5~10 times of compressor operating current)

K15

PTC starter open circuited

Compressor is unable to start, and pickup current is exorbitant (approximately 5~10 times of compressor operating current)

K16

Terminals H-L of WDF thermostat open circuited

Door lamp lights up but the compressor is not working at direct cooling mode

K17

System filth blockage

The pressure gauge at low-pressure side registers a negative pressure value at running status

K18

System freezeup

K19, K20, K21

Backup

 

 

 

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