Manual - Hoshizaki Lancer


Add to my manuals
44 Pages

advertisement

Manual - Hoshizaki Lancer | Manualzz

NO. T040-822

ISSUED: JAN. 12, 2011

REVISED:

HOSHIZAKI

UNDERCOUNTER

REFRIGERATOR/FREEZER

MODEL

RTE-120/150/180SNA

RTE-120/170SDA-GN

FTE-120/150/180SNA

FTE-120/170SDA-GN

SERVICE MANUAL

CONTENTS

PAGE

I. GENERAL INFORMATION --------------------------------------------------------------------------1

1. SAFETY INSTRUCTIONS -------------------------------------------------------------------------1

2. DIMENSIONS/SPECIFICATIONS ---------------------------------------------------------------3

[a] RTE-120SNA -------------------------------------------------------------------------------------3

[b] RTE-150SNA -------------------------------------------------------------------------------------4

[c] RTE-180SNA --------------------------------------------------------------------------------------5

[d] RTE-120SDA-GN --------------------------------------------------------------------------------6

[e] RTE-170SDA-GN --------------------------------------------------------------------------------7

[f] FTE-120SNA ---------------------------------------------------------------------------------------8

[g] FTE-150SNA --------------------------------------------------------------------------------------9

[h] FTE-180SNA ------------------------------------------------------------------------------------ 10

[i] FTE-120SDA-GN ------------------------------------------------------------------------------- 11

[j] FTE-170SDA-GN ------------------------------------------------------------------------------- 12

II. TECHNICAL INFORMATION --------------------------------------------------------------------- 13

1. WIRING DIAGRAM -------------------------------------------------------------------------------- 13

[a] RTE SERIES ------------------------------------------------------------------------------------ 13

[b] FTE SERIES ------------------------------------------------------------------------------------ 14

2. REFRIGERATION CIRCUIT -------------------------------------------------------------------- 15

3. ELECTRONIC CONTROLS --------------------------------------------------------------------- 16

[a] SET POINT TEMPERATURE -------------------------------------------------------------- 16

[b] CABINET TEMPERATURE DIFFERENTIAL ------------------------------------------- 16

[c] DEFROST CYCLE ---------------------------------------------------------------------------- 16

[d] DEFROST COMPLETION TEMPERATURE ------------------------------------------- 16

[e] CLOGGED CONDENSER DETECTION TEMPERATURE ------------------------- 16

[f] TEMPERATURE DISPLAY CYCLE -------------------------------------------------------- 16

[g] COMPRESSOR SOFT START ------------------------------------------------------------- 17

[h] CABINET TEMPERATURE AND TEMPERATURE DISPLAY ---------------------- 17

[i] RESOLUTION ----------------------------------------------------------------------------------- 18

[j] SET POINT TEMPERATURE AND CABINET TEMPERATURE ------------------- 18

[k] CHECKING AND ADJUSTING SET POINT TEMPERATURE --------------------- 18

[l] MANUAL DEFROST --------------------------------------------------------------------------- 19

[m] CANCELLING SOFT START -------------------------------------------------------------- 19

4. ERROR CODES ----------------------------------------------------------------------------------- 19

[a] EEPROM WRITE ERROR (EA) ----------------------------------------------------------- 19

[b] EEPROM VERIFY ERROR (ED) ---------------------------------------------------------- 20

[c] CABINET TEMPERATURE TOO HIGH (E1) ------------------------------------------- 20

[d] CABINET TEMPERATURE TOO LOW (E2) -------------------------------------------- 21

[e] DEFROST CYCLE TOO LONG (E3) ----------------------------------------------------- 21

[f] ABNORMAL PRESSURE (E4) -------------------------------------------------------------- 22

[g] CONDENSER CLOGGED (E7) ------------------------------------------------------------ 23

[h] DEFROST THERMISTOR DEFECTIVE (E8) ------------------------------------------ 23

[i] CLOG THERMISTOR DEFECTIVE (E9) ------------------------------------------------ 24

5. ENERGY SAVING CONTROL ------------------------------------------------------------------ 24

[a] STANDARD MODE --------------------------------------------------------------------------- 24

[b] ENERGY SAVING MODE ------------------------------------------------------------------- 25

[c] CABINET TEMPERATURE CORRECTION -------------------------------------------- 25 i

6. TIMING CHART ------------------------------------------------------------------------------------ 26

[a] STANDARD MODE (RTE series) ---------------------------------------------------------- 26

[b] ENERGY SAVING MODE (RTE series) ------------------------------------------------- 27

[c] STANDARD MODE (FTE series) ---------------------------------------------------------- 28

[d] ENERGY SAVING MODE (FTE series) -------------------------------------------------- 29

[e] FORCED STARTUP (CANCELING SOFT START) ----------------------------------- 29

III. SERVICE DIAGNOSIS ---------------------------------------------------------------------------- 30

1. FLOWCHART --------------------------------------------------------------------------------------- 30

2. SERVICE DIAGNOSIS --------------------------------------------------------------------------- 31

3. CONTROLLER BOARD -------------------------------------------------------------------------- 33

[a] SERVICING CONTROLLER BOARD ---------------------------------------------------- 33

[b] CHECKING THERMISTOR ----------------------------------------------------------------- 34

IV. REMOVAL AND REPLACEMENT OF COMPONENTS ---------------------------------- 36

1. REFRIGERATION UNIT-------------------------------------------------------------------------- 36

2. REFRIGERATION CIRCUIT -------------------------------------------------------------------- 37

[a] REFRIGERANT -------------------------------------------------------------------------------- 37

[b] COMPRESSOR -------------------------------------------------------------------------------- 37

[c] EVAPORATOR AND DEFROST HEATER ---------------------------------------------- 37

[d] CONDENSER ---------------------------------------------------------------------------------- 39

3. CONTROL BOX ------------------------------------------------------------------------------------ 39

4. FAN MOTORS -------------------------------------------------------------------------------------- 39

[a] CONDENSER FAN MOTOR ---------------------------------------------------------------- 39

[b] INTERIOR FAN MOTOR -------------------------------------------------------------------- 40

5. THERMISTORS ------------------------------------------------------------------------------------ 40

[a] INTERIOR THERMISTOR ------------------------------------------------------------------ 40

[b] DEFROST THERMISTOR------------------------------------------------------------------- 40

[c] CLOG THERMISTOR ------------------------------------------------------------------------ 41

6. DOOR GASKET ------------------------------------------------------------------------------------ 41

[a] REMOVAL --------------------------------------------------------------------------------------- 41

[b] REPLACEMENT ------------------------------------------------------------------------------- 41

Symbol

Keep Dry

Meaning

Cabinet Temperature

Increasing Temperature

Decreasing Temperature ii

I. GENERAL INFORMATION

1. SAFETY INSTRUCTIONS

The following instructions contain important safety precautions and should be strictly observed. The terms used here are defined as follows:

WARNING: There is a possibility of death or serious injury to the service person and a third party or the user due to improper service operations or defects in serviced products.

CAUTION: There is a possibility of injury to the service person and a third party or the user or damage to their property* due to improper service operations or defects in serviced products.

* The term “damage to their property” here refers to extensive damage to household effects, houses and pets.

WARNING

1. Always ask the user to keep children away from the work area. They may be injured by tools or disassembled products.

2. When there is no need to energize the unit during disassembly or cleaning, be sure to unplug the unit or disconnect the main power supply before servicing the unit to prevent electric shocks.

3. If the unit must be energized for inspection of the electric circuit, use rubber gloves to avoid contact with any live parts resulting in electric shocks.

4. Keep the following in mind when servicing the refrigeration circuit:

(1) Be sure to recover the refrigerant. Do not discharge it into the atmosphere. It will affect the environment.

(2) Check for any flames in the vicinity, and ensure good ventilation.

(3) If the refrigerant should leak in servicing, immediately put out any fire used in the vicinity.

(4) When unbrazing the refrigeration circuit connections, check that the circuit is completely evacuated. The refrigerant may produce a poisonous gas when coming in contact with an open flame.

(5) Do not braze in an enclosed room to prevent carbon monoxide poisoning.

(6) In case of a refrigerant leak, locate and repair the leaking part completely before recharging the refrigerant and checking for further leaks. If the leaking part cannot

1

be located, be sure to check again for further leaks after recharging the refrigerant.

Leaked refrigerant may produce a poisonous gas when coming in contact with an open flame of a gas cooking stove or a fan heater.

(7) Before servicing, check the surface temperature of the refrigeration circuit to prevent a burn.

5. Keep the following in mind when making electrical connections:

(1) Check for proper earth connections, and repair if necessary to prevent electric shocks.

(2) Always use service parts intended for the applicable model for replacement of defective parts. Use proper tools to secure the wiring. Otherwise abnormal operation or trouble may occur and cause electric leaks or fire.

(3) Check for proper part installations, wiring conditions and soldered or solderless terminal connections to avoid fire, heat or electric shocks.

(4) Be sure to replace damaged or deteriorated power cords and lead wires to prevent fire, heat or electric shocks.

(5) Cut-off lead wires must be bound using closed end connectors or the like, with their closed ends up to avoid entrance of moisture that could lead to electric leaks or fire.

(6) After servicing, always use a megohmmeter (500V DC) to check for the insulation resistance of at least 1 megohm between the live part (attachment plug) and the dead metal part (earth terminal).

(7) Do not service the electrical parts with wet hands to prevent electric shocks.

(8) The capacitors used for the compressor and other components may be under high voltage and should be discharged properly before servicing.

CAUTION

1. After servicing, follow the instructions below:

(1) Always check the unit for proper operation before finishing services.

(2) Be sure to reassemble the parts completely. Loose assembly of such parts as control box cover may cause entrance of vermins resulting in a short circuit between terminals and possible ignition.

2

2. DIMENSIONS/SPECIFICATIONS

[a] RTE-120SNA

3

[b] RTE-150SNA

4

[c] RTE-180SNA

5

[d] RTE-120SDA-GN

6

[e] RTE-170SDA-GN

7

[f] FTE-120SNA

8

[g] FTE-150SNA

9

[h] FTE-180SNA

10

[i] FTE-120SDA-GN

11

[j] FTE-170SDA-GN

12

II. TECHNICAL INFORMATION

1. WIRING DIAGRAM

[a] RTE SERIES

13

[b] FTE SERIES

14

2. REFRIGERATION CIRCUIT

Refrigerant: HFC-134a (RTE series)

HFC-404A (FTE series)

Condenser Fan Motor

15

3. ELECTRONIC CONTROLS

[a] SET POINT TEMPERATURE (mean temperature between compressor ON and OFF temperatures)

RTE series: -6 to +12°C

FTE series: -25 to -7°C

Set Point Temperature

Time

Compressor

ON

OFF

[b] CABINET TEMPERATURE DIFFERENTIAL

3.5 K OFF temperature = Set point temp - 2.0 K

ON temperature = Set point temp + 1.5 K

Note: On the Controller Board only. Actual differential may be larger.

[c] DEFROST CYCLE

Every 6 hours

Note: During a defrost cycle, the Temperature Display Window indicates “dF”. See “6.

TIMING CHART” for further details.

[d] DEFROST COMPLETION TEMPERATURE

RTE series: 15°C

FTE series: 5°C

[e] CLOGGED CONDENSER DETECTION TEMPERATURE

RTE series: 58°C for 2 minutes

FTE series: 58°C for 2 minutes

[f] TEMPERATURE DISPLAY CYCLE

The Temperature Display Window renews its cabinet temperature display every 30 seconds. The display remains the same for 30 seconds even if the actual temperature changes in the meantime. During a defrost cycle, the Temperature Display Window indicates “dF”.

16

[g] COMPRESSOR SOFT START

1) Startup

Power ON

3.5 min

Compressor

Condenser Fan Motor

Interior Fan Motor

Cabinet Temp Display

ON

OFF

ON

OFF

ON

OFF

When the power supply is turned on, the Interior Fan Motor starts up and the Temperature

Display Window shows the cabinet temperature, but the Compressor and Condenser Fan

Motor start up with a 3.5 minute delay.

This delay is intended to minimize the difference between the high-side and low-side pressures and to reduce the load on the Compressor so that it can start easily in case of a short (especially instantaneous) power failure.

2) Normal Control

Interior Thermistor

Compressor

Condenser Fan Motor

ON

OFF

ON

OFF

Min

3.5 min

Min

3.5 min

When the Compressor turns off during normal control, it has a mandatory 3.5 minute delay before startup. For example, if the Compressor turns off by its Thermistor and the Door is opened immediately after (causing the cabinet temperature to immediately exceed the restart temperature), the Compressor will still not start until 3.5 minutes have passed since its shutdown.

[h] CABINET TEMPERATURE AND TEMPERATURE DISPLAY

Cabinet

Temp

Temp

Display

Included

Not included

17

[i] RESOLUTION

0.5 K (1 K for temperature setting and display)

[j] SET POINT TEMPERATURE AND CABINET TEMPERATURE

(Compressor OFF temperature / Compressor ON temperature)

Refrigerator

(RTE series)

Freezer

(FTE series)

Set Point Temp (°C)

Cabinet Temp (°C)

Set Point Temp (°C)

Cabinet Temp (°C)

Set Point Temp (°C)

Cabinet Temp (°C)

Set Point Temp (°C)

Cabinet Temp (°C)

12

10/13

6

4/7

0

-2/1

-6

-8/-5

11

9/12

5

3/6

-1

-3/0

10

8/11

4

2/5

-2

-4/-1

9

7/10

3

1/4

-3

-5/-2

8

6/9

2

0/3

-4

-6/-3

7

5/8

1

-1/2

-5

-7/-4

Set Point Temp (°C)

Cabinet Temp (°C)

-7

-9/-6

-8

-10/-7

-9 -10 -11 -12

-11/-8 -12/-9 -13/-10 -14/-11

Set Point Temp (°C) -13 -14 -15 -16 -17 -18

Cabinet Temp (°C) -15/-12 -16/-13 -17/-14 -18/-15 -19/-16 -20/-17

Set Point Temp (°C) -19 -20 -21 -22 -23 -24

Cabinet Temp (°C) -21/-18 -22/-19 -23/-20 -24/-21 -25/-22 -26/-23

Set Point Temp (°C) -25

Cabinet Temp (°C) -27/-24

[k] CHECKING AND ADJUSTING SET POINT TEMPERATURE

Press the Set Point Button to display the set point temperature on the Temperature

Display Window. To change the set point temperature, hold down the Set Point

Button and press the Temperature Control

Button.

Set Point Button

The set point temperature cannot be memorized until 10 seconds have passed since its adjustment. That is, if the power supply is turned off within 10 seconds after adjustment, the set point temperature will remain the same as before when the power supply is turned back on.

Temperature

Control Button

Temperature

Display Window

250V-10A

18

[l] MANUAL DEFROST

When the two Temperature Control Buttons are pressed at the same time for 3 seconds, the refrigerator/freezer will start a manual defrost cycle. The refrigerator/freezer will start repeating automatic defrost cycles 6 hours after the Temperature Control Buttons are pressed.

Note: The refrigerator/freezer will not start a manual defrost cycle if the Defrost Thermistor senses a temperature of 15°C or more (RTE series) or 5°C or more (FTE series).

[m] CANCELING SOFT START

To cancel the “Soft Start” (3.5 minute delay), turn on the power supply while pressing the

Set Point Button. The Compressor and Condenser Fan Motor will start at the same time after the Temperature Display Window shows the data code for 0.5 second.

Data code: RTE series A5

FTE series B5

4. ERROR CODES

In case of trouble, the Temperature Display Window will alternately flash every second between one of the following error codes and the cabinet temperature or “dF” during a defrost cycle. The error codes are displayed in the following order of priority:

Priority

1

2

3

4

7

8

5

6

9

Code

ED

EA

E8

E9

E4

E7

E3

E1

E2

Error

EEPROM Verify Error

EEPROM Write Error

Defrost Thermistor Defective

Clog Thermistor Defective

Abnormal Pressure

Condenser Clogged

Defrost Cycle Too Long

Cabinet Temperature Too High

Cabinet Temperature Too Low

[a] EEPROM WRITE ERROR (EA)

When the values written on EEPROM (IC3) differ from those retrieved for verification, “EA” will be displayed.

The “EA” display will not reset until the power supply is turned off.

The EEPROM (IC3) may be defective. Replace the Controller Board.

19

[b] EEPROM VERIFY ERROR (ED)

When every value retrieved from EEPROM (IC3) for verification differs from the memory setting of the Controller Board, “ED” will be displayed.

The “ED” display will automatically reset when retrieved values have been verified.

The EEPROM (IC3) may be defective. Replace the Controller Board.

[c] CABINET TEMPERATURE TOO HIGH (E1)

When the cabinet temperature rises to the alert temperature (10 K above the set point), the

High Temperature Alert Timer will start counting down from 120 minutes. When the Timer counts down to zero, “E1” will be displayed. If the cabinet temperature drops below the alert temperature before the Timer counts down to zero, the Timer will reset and “E1” will not be displayed.

When the power supply is turned on, this function will not work until the cabinet temperature drops below the Compressor OFF temperature. This function is available even during a defrost cycle.

The “E1” display will automatically reset when the cabinet temperature drops below the

Compressor OFF temperature.

The cause may be:

1) The Doors are opened too frequently or left open.

2) The Interior Thermistor (black) is defective.

3) The Compressor is defective or gas is leaking.

Power ON

Alert Timer resets

Alert Timer less than 120 min

Alert Timer

120 min

Alert Temp

(Set Point + 10 K)

Cabinet Temp

Set Point + 1.5 K

Set Point Temp

Set Point - 2.0 K

Temp Display

Window

Differential

(3.5 K)

Cabinet temp

“E1” error resets

Flashing “E1”

20

[d] CABINET TEMPERATURE TOO LOW (E2)

When the cabinet temperature drops to the alert temperature (5 K below the set point), the

Low Temperature Alert Timer will start counting down from 60 minutes. When the Timer counts down to zero, “E2” will be displayed. If the cabinet temperature rises above the alert temperature before the Timer counts down to zero, the Timer will reset and “E2” will not be displayed.

When the power supply is turned on, the Timer will start counting if the cabinet temperature is below the alert temperature (5 K below the set point). This function is available even during a defrost cycle.

The “E2” display will automatically reset when the cabinet temperature rises above the

Compressor ON temperature.

The cause may be:

1) The ambient temperature is too low, or a large amount of frozen food is stored inside.

2) The Interior Thermistor (black) is defective.

Differential

(3.5 K)

“E2” error resets

Set Point + 1.5 K

Set Point Temp

Set Point - 2.0 K

Alert Temp

(Set Point - 5 K)

Alert Timer less than 60 min

Alert Timer resets

Cabinet temp

Alert Timer

60 min

Temp Display

Window

Flashing “E2”

[e] DEFROST CYCLE TOO LONG (E3)

When the Defrost Thermistor does not turn off after 60 minutes have passed since the defrost cycle starts, “E3” will be displayed. In this case, the refrigerator/freezer will proceed to the next process: (1) Defrost cycle terminated, (2) Drain, (3) Fan Motor delay, (4) “dF” display delay, (5) Cooling cycle.

The “E3” display will not reset until the power supply is turned off.

The cause may be:

1) The Defrost Heater is defective.

2) The Thermal Fuse is brown.

3) The Defrost Thermistor (orange) is defective.

4) A large amount of moist food is stored inside.

21

Defrost starts

Defrost Thermistor senses

Drain

“dF” display delay ends

Compressor

ON

OFF

60 min

Defrost Heater

ON

OFF

Temp Display

Window

Cabinet temp “dF” “E3” / ”dF” “E3” / cabinet temp

Flashing “E3”

[f] ABNORMAL PRESSURE (E4)

When the Clog Thermistor senses a temperature above 70°C (RTE series) or 65°C (FTE series), the refrigerator/freezer will detect an abnormal pressure to stop the Compressor for 5 minutes. At the first detection, the Pressure Alert Timer will start counting down from

60 minutes.

The Compressor will restart after the 5 minute interruption, if the Clog Thermistor senses a temperature below 60°C (RTE series) or 55°C (FTE series). The Compressor will not restart until the above conditions are satisfied. If an abnormal pressure is still detected, the

Compressor will stop again.

If an abnormal pressure is detected five times before the Timer counts down to zero, “E4” will be displayed. If the Timer has already counted down by then, “E4” will not be displayed.

This function is available even during a defrost cycle.

The “E4” display will not reset until the power supply is turned off.

The cause may be:

1) The Condenser Fan Motor is locked or defective.

2) The Condenser Filter is clogged with dirt or dust.

Clog Thermistor

*RTE(FTE)

*70°C

(65°C)

*60°C

(55°C)

5

60 min min

60 min min

Compressor

ON

OFF

Temp Display

Window

Cabinet temp

22

Flashing “E4”

[g] CONDENSER CLOGGED (E7)

When the Clog Thermistor senses a temperature above 58°C (RTE series) or 58°C (FTE series) for 2 minutes, “E7” will be displayed.

The “E7” display will automatically reset when the Clog Thermistor senses a temperature below the above point.

The cause may be:

1) The Condenser Fan Motor is locked or defective.

2) The Condenser Filter is clogged with dirt or dust.

Clog Timer resets

High

Clog Timer less than 2 min

Clog Timer resets

Clog Timer

2 min

Clog Detection

RTE: 58°C

FTE: 58°C

Clog Thermistor reading

“E7” error resets

Low

Temp Display

Window

Cabinet temp

Flashing

“E7”

[h] DEFROST THERMISTOR DEFECTIVE (E8)

When the Defrost Thermistor senses a temperature below -55°C (open circuit) or above

50°C for 10 minutes (short circuit), “E8” will be displayed. A short circuit will not be detected for 1 hour after the power supply is turned on. When the power supply is turned on with the

Set Point Button pressed (to cancel soft start), a short circuit will be detectable immediately after startup.

This function is not available during a defrost, drain or Fan Motor delay process.

In case of an open circuit, the “E8” display will automatically reset when the temperature rises above -55°C. In case of a short circuit, the “E8” display will automatically reset when the temperature drops below 50°C.

The cause may be:

1) The Defrost Thermistor (orange) is defective.

23

Short Circuit

Detection (50°C)

Less than

10 min

10 min

Short circuit error resets

Defrost Thermistor reading

Open circuit error resets

Open Circuit

Detection (-55°C)

Temp Display

Window

Cabinet temp

Flashing

“E8”

Cabinet temp

Flashing

“E8”

[i] CLOG THERMISTOR DEFECTIVE (E9)

When the Clog Thermistor senses a temperature below -22°C (open circuit) or above 86°C for 10 minutes (short circuit), “E9” will be displayed. When the power supply is turned on with the Set Point Button pressed (to cancel soft start), a short circuit will be detectable immediately after startup.

In case of an open circuit, the “E9” display will automatically reset when the temperature rises above -22°C. In case of a short circuit, the “E9” display will automatically reset when the temperature drops below 86°C.

The cause may be:

1) The Clog Thermistor (gray) is defective.

Less than

10 min

10 min

Short circuit error resets

Short Circuit

Detection (86°C)

Clog Thermistor reading

Open circuit error resets

Open Circuit

Detection (-22°C)

Temp Display

Window

Cabinet temp

Flashing

“E9”

Cabinet temp

Flashing

“E9”

5. ENERGY SAVING CONTROL

[a] STANDARD MODE

To quickly refrigerate stored items, select the standard mode by pressing and holding the downward Temperature Control Button “▼” for 5 seconds. The decimal point disappears from the Temperature Display Window, and the Interior Fan Motor runs continuously. To

24

resume the energy saving control, press and hold the downward Temperature Control

Button “▼” again for 5 seconds. The decimal point reappears on the Temperature Display

Window.

[b] ENERGY SAVING MODE

The refrigerator/freezer is under energy saving control while the Temperature Display

Window indicates a decimal point. While the cabinet temperature is rising in control operation, the Interior Fan Motor operates intermittently.

Compressor

ON

OFF

ON time

OFF time

Interior Fan Motor

ON

OFF

Cabinet Temp

*RTE(FTE)

*15°C(5°C)

ON temp

OFF temp

Model

RTE

FTE

Interior Fan Motor ON/OFF Time

Cabinet Temp Setting

0 to 12°C

ON Time

15 sec

OFF Time

150 sec

-6 to -1°C

N/A

15 sec

30 sec

90 sec

30 sec

[c] CABINET TEMPERATURE CORRECTION

Any difference between the actual cabinet center temperature and the displayed temperature (Thermistor reading) can be corrected within -5.0 to 5.0 K in 0.5 K steps.

1) Turn on the power supply while pressing and holding the upward Temperature Control

Button “▲”. The cabinet temperature correction mode becomes available, and the current offset appears on the Temperature Display Window (e.g. “10” stands for 1.0 K).

2) To correct the offset, press the Temperature Control Button. To store the offset, press the Set Point Button. The Temperature Display Window goes off for a moment.

3) Turn off the power supply and turn it back on. The cooling cycle begins with the corrected offset.

Set point 3°C

3.0K

6°C

Cabinet temp

For example, as shown on the right, if the average cabinet temperature is 3 K higher than the Thermistor reading, set the offset to 3.0 K (standard setting: 1.0 K).

The cabinet temperature will be controlled at 3°C.

3°C

Thermistor reading

25

6. TIMING CHART

[a] STANDARD MODE (RTE series)

Compressor

(X1)

ON

OFF

Soft timer

3.5 min

Interior Fan

Motor (X3)

ON

OFF

Defrost

Heater (X2)

ON

OFF

Interior

Thermistor

ON temp

OFF temp

Defrost

Thermistor

15°C

Defrost thermistor reads 15°C

“dF” display

Drain

5 min

FM delay

5 min

Display delay

1 min

Anti-fan lock

10 sec

26

[b] ENERGY SAVING MODE (RTE series)

“dF” display

Drain

5 min

FM delay

5 min

Display delay

1 min

Compressor

(X1)

ON

OFF

Soft timer

3.5 min

Interior Fan

Motor (X3)

ON

OFF

15 sec 150 sec

Defrost thermistor reads 15°C

Defrost

Heater (X2)

ON

OFF

Interior

Thermistor

ON temp

OFF temp

Defrost

Thermistor

15°C

Anti-fan lock

10 sec

The Interior Fan Motor operates intermittently while the Compressor is OFF.

27

[c] STANDARD MODE (FTE series)

Compressor

(X1)

ON

OFF

Soft timer

3.5 min

Interior Fan

Motor (X3)

ON

OFF

Defrost

Heater (X2)

ON

OFF

Interior

Thermistor

ON temp

OFF temp

Defrost

Thermistor

5°C

Defrost thermistor reads 5°C

“dF” display

Drain

5 min

FM delay

5 min

Display delay

8 min

Anti-fan lock

10 sec

28

[d] ENERGY SAVING MODE (FTE series)

“dF” display

Drain

5 min

FM delay

5 min

Display delay

8 min

Compressor

(X1)

ON

OFF

Soft timer

3.5 min

Interior Fan

Motor (X3)

ON

OFF

30 sec 30 sec

Defrost thermistor reads 5°C

Defrost

Heater (X2)

ON

OFF

Interior

Thermistor

ON temp

OFF temp

Defrost

Thermistor

5°C

[e] FORCED STARTUP (CANCELING SOFT START)

Interior Fan

Motor

Power ON

Compressor

ON

OFF

ON

OFF

The Compressor and Interior Fan Motor start at the same time.

29

Anti-fan lock

10 sec

III. SERVICE DIAGNOSIS

1. FLOWCHART

Exposed to direct sunlight

Located near heat producing equipment

Refrigeration unit poorly

Cabinet interior

Condenser fan motor

Unfreezing (defrost)

Heater defrost

Cooling capacity

Start capacitor Run capacitor

Temperature not displayed

30

Cabinet temperature too high

(E1)

7

Interior fan motor

8

Relay (controller board)

Cabinet temperature too low

(E2)

2

Interior thermistor

8

Relay

1

Controller board

Abnormal noise

12

Compressor

6, 7

Fan motor

8

Relay

2. SERVICE DIAGNOSIS

Chart Item Possible Cause / Check

1 Controller Board See "3. CONTROLLLER BOARD".

2 Interior Thermistor

3 Defrost Thermistor

4 Clog Thermistor

5 Air Filter

Air-Cooled

Condenser

6 Condenser Fan

Motor

Clogged.

Dirty fins.

No temperature difference between inlet and outlet copper tubes.

Burning smell.

Fan locked and not movable by hand.

Check continuity between leads.

Insulation failure.

7 Interior Fan Motor See 6 above.

Clean.

Remedy

Clean or wash.

Replace.

31

Chart

8 Relay

Item Possible Cause / Check

Check continuity between terminals.

Press armature if any.

Release

Press

Power Relay

∞ Ω

0 Ω

Normally closed contact

0 Ω

∞ Ω

Replace.

Remedy

9 Defrost Cycle

10 Defrost Heater

11 Thermal Fuse

Thermostat

12 Compressor

G4F-11123T G2R-1A-T

See "II. 6. TIMING CHART".

Check continuity.

Check continuity.

Replace.

Replace.

13 Overload Relay

14 Starter

Motor noisy and locked.

Discharge pipe will not heat up after startup. No pressure difference between high and low sides.

Check continuity between terminal and earth.

Check resistance between terminals.

Replace.

Compression failure.

Replace.

Not less than 1MΩ by 500V megger is acceptable.

Replace.

Too low = burnout

∞ = open circuit

[Reference] Winding resistance (25°C)

Model

Output

(W)

TL4G

FR6G

110

150

FR8.5G

215

Winding Resistance (Ω)

Primary

(M-C)

18.2

12.6

8.9

Secondary

(S-C)

15.1

12.4

12.0

Terminal location (front view)

Primary Secondary

(M) (S)

Loose connection.

Damaged case.

Check continuity.

Check continuity between terminals.

Common

(C)

Tighten.

Replace.

Replace.

Model

117U6004

117U6000

117U6015

Compressor Model

TL4G

FR6G

FR8.5G

32

Chart Item

15 Start Capacitor

Run Capacitor

Possible Cause / Check

Deformed or cover damaged.

Leaking impregnating agent.

Loose connection.

Check resistance between terminals.

Acceptable if pointer moves instantly when tester is applied and gradually moves back. Not acceptable if pointer

16 Fuse reads 0 Ω.

Blown out.

17 Supply Voltage Check for ±6% of rated voltage.

18 Switching

Regulator

Check for voltage of 220 - 240V AC

(primary) and 12V DC (secondary).

19 Refrigerant Leak Compressor discharge pipe will not heat up.

Compressor suction pipe will not cool down.

Check with leak detector.

20 Clogged

Refrigeration

Circuit

Clogged with moisture.

Clogged with dust.

Replace.

Tighten.

Replace.

Remedy

Replace.

Increase power supply capacity.

Plug into a separate power receptacle.

Replace.

Repair and recharge.

Note: Low-side leak requires drying after welding.

Replace Drier also.

Replace Drier.

Replace Capillary Tube.

3. CONTROLLER BOARD

[a] SERVICING CONTROLLER BOARD

1) When receiving a service call, ask the user to turn off the power supply and turn it back on, while watching the unit. This will reset the controller, and in some cases normal operation will resume.

2) Keep the following in mind when servicing the Controller Board:

* Check that the unit has been earthed properly. If not, the Controller Board will not work properly.

* To get static free, always touch the cabinet (earth) before servicing. Electrostatic discharge will cause severe damage to the Controller Board. Also, keep it away from vinyl, plastic or other electrostatically charged products.

* Do not touch the reverse side of the Controller Board and tiny electronic devices on it.

* Handle the Controller Board by the edges only. Do not push the electric parts and wires.

* Do not drop the Controller Board on the floor.

33

* Do not short circuit the Relay output terminal coming from the Controller Board.

* To protect the pattern from damage, place the Controller Board on a flat surface.

* The Thermistor leads have a thin coating and are potentially breakable. Do not tension the leads.

* The connectors must not be subjected to tension to prevent disconnection or breakage.

After servicing the Controller Board, check for disconnected connectors.

* The Thermistor is provided with single-wire leads. Do not bend or stretch them (about

400 mm from the end and at lead connections).

* Do not pinch or weigh down the Thermistor and Thermistor leads. The coatings may be broken, resulting in a short circuit.

* Keep the Thermistor leads at least 30 mm away from high voltage (100V AC or more) wires, especially fluorescent wires.

[b] CHECKING THERMISTOR

1) Disconnect the Thermistor connector from the Controller Board.

2) Fill a glass with ice water at a temperature of 0°C. Soak the Thermistor Bulb in the water (at the center of the glass) for 5 minutes.

3) Measure the resistance of the Thermistor by the ohm scale of a tester.

4) Replace the Thermistor if the resistance is not within the following range (see T-R curves below):

Clog Thermistor:

Interior/Defrost Thermistor:

145 - 175 kΩ (standard: 160 kΩ)

5 - 6.5 kΩ (standard: 6 kΩ)

34

T-R Curve (Clog Thermistor)

Temperature (°C)

T-R Curve (Interior/Defrost Thermistor)

Note:

This curve only shows reference values and can be slightly different from actual values.

Temperature (°C)

35

IV. REMOVAL AND REPLACEMENT OF COMPONENTS

WARNING

Always unplug the refrigerator/freezer before replacing components.

1. REFRIGERATION UNIT

1) Remove the pan head screw with washers (stainless steel M5x50) at the bottom of the

Front Panel.

2) Disconnect the connectors under the Control Box.

3) Remove the two hexagon nuts (stainless steel M6) on the Evaporator Box Panel.

4) Pull out the Refrigeration Unit Base. Be careful not to damage the refrigeration circuit and not to spill drain water from the Refrigeration Unit Base.

5) To replace the removed parts, reverse the above removal procedure.

Note: 1. When pulling out or pushing in the Refrigeration Unit Base, do not let the refrigeration circuit touch the cabinet to prevent gas leaks from the welded parts.

2. Keep the external wiring away from the Fan Motor or Discharge Pipe.

3. Some drain water may remain in the Refrigeration Unit Base. When pulling out the Refrigeration Unit Base, be careful not to spill drain water and wet the floor.

Front Panel

36

2. REFRIGERATION CIRCUIT

[a] REFRIGERANT

Refrigerant R134a (RTE series) or R404A (FTE series) used for this refrigerator/freezer is not flammable or poisonous itself. It also provides remarkably lower pressure than ammonia or similar substances at the same condensing temperatures.

[b] COMPRESSOR

1) Pull out the Refrigeration Unit Base according to steps 1) through 4) of “1.

REFRIGERATION UNIT”.

2) Use a screwdriver to remove the clamp from the Terminal Cover enclosing the

Compressor’s electrical parts.

3) Take off the Terminal Cover, and remove the Start Capacitor and Starting Relay.

4) Recover the refrigerant from the Access Valve, and store it in a proper container, if required by an applicable law.

5) Disconnect the Discharge and Suction Pipes using brazing equipment.

6) Remove the three bolts (M6x35) securing the Compressor.

7) To replace the removed parts, reverse the above removal procedure.

Note: 1. To recharge the refrigerant, install a stop valve in the access line.

2. Evacuation time must be at least 1 hour.

3. To prevent oxidation, braze or solder the pipes with nitrogen gas flowing.

4. Check for gas leaks, remove flux and oxide film, and apply anti-corrosion treatment.

5. Always charge R404A (FTE series) in the liquid stage to maintain the blend consistency.

[c] EVAPORATOR AND DEFROST HEATER

1) Pull out the Refrigeration Unit Base according to steps 1) through 4) of “1.

REFRIGERATION UNIT”.

2) Recover the refrigerant from the Access Valve, and store it in a proper container, if required by an applicable law.

37

3) Remove the Clip and Defrost Thermistor from the top of the Evaporator.

4) Remove the truss head tapping screw (stainless steel 4x8) securing the Interior

Thermistor Plate located under the Interior Fan Motor on the Evaporator Cover.

5) Remove the two truss head tapping screws (stainless steel 4x16) and U-Band securing the refrigeration circuit inside the Evaporator Box Panel.

6) Disconnect the Glass Tube Heater and Interior Fan Motor leads, and remove the Clip and Thermal Fuse.

7) Remove the two truss head tapping screws (stainless steel 4x8) securing the Heater

Cover.

8) Remove the six truss head tapping screws (stainless steel 4x8) securing the

Evaporator, Evaporator Cover, and Evaporator Bracket.

9) Disconnect the Evaporator from the refrigeration circuit using brazing equipment.

10) To replace the removed parts, reverse the above removal procedure.

Note: 1. See Notes 1 - 5 for “[b] COMPRESSOR”.

2. For RTE series, the Glass Tube Heater must be fit to the U-notches at the bottom of the Heater Cover.

Evaporator Box Panel

Thermal Fuse

Shroud

Defrost Thermistor

Evaporator

Condenser

Glass Tube Heater

Interior Thermistor

Heater Cover

Interior Fan Motor

38

[d] CONDENSER

1) Pull out the Refrigeration Unit Base according to steps 1) through 4) of “1.

REFRIGERATION UNIT”.

2) Recover the refrigerant from the Access Valve, and store it in a proper container, if required by an applicable law.

3) Remove the Evaporator Box Panel from the Shroud on top of the Condenser by unscrewing the two hexagon head bolts with washers (5x10).

4) Remove the Shroud from the Condenser by unscrewing the two truss head tapping screws (stainless steel 4x8).

5) Remove the two truss head tapping screws (stainless steel 4x16) securing the

Condenser.

6) Disconnect the Condenser from the refrigeration circuit using brazing equipment.

7) To replace the removed parts, reverse the above removal procedure.

Note: See Notes 1 - 5 for “[b] COMPRESSOR”.

3. CONTROL BOX

1) Remove the pan head screw with washers (stainless steel M5x50) at the bottom of the

Front Panel.

2) Remove the connectors under the Control Box and the Thermistor connectors.

3) Remove the Control Box from the Evaporator Box Panel by unscrewing the two truss head tapping screws (stainless steel 4x16).

4) Remove the Control Box Cover.

5) Replace the parts inside the Control Box.

6) To replace the removed parts, reverse the above removal procedure.

4. FAN MOTORS

[a] CONDENSER FAN MOTOR

1) Pull out the Refrigeration Unit Base according to steps 1) through 4) of “1.

REFRIGERATION UNIT”.

39

2) Disconnect the Condenser Fan Motor leads.

3) Remove the Condenser Fan Motor with the Bracket by unscrewing the two truss head tapping screws (stainless steel 4x16).

4) Take the Condenser Fan Motor off the Bracket.

5) To replace the removed parts, reverse the above removal procedure.

Note: The nuts securing the Fan Motor must be turned clockwise to loosen and counterclockwise to tighten.

[b] INTERIOR FAN MOTOR

1) Pull out the Refrigeration Unit Base according to steps 1) through 4) of “1.

REFRIGERATION UNIT”.

2) Disconnect the Interior Fan Motor leads.

3) Remove the Interior Fan Motor from the Evaporator Cover by unscrewing the four pan head machine screws with washers (stainless steel 4x30).

4) To replace the removed parts, reverse the above removal procedure.

5. THERMISTORS

[a] INTERIOR THERMISTOR

1) Pull out the Refrigeration Unit Base according to steps 1) through 4) of “1.

REFRIGERATION UNIT”.

2) Cut the cable tie to remove the Interior Thermistor from the Thermistor Plate located under the Interior Fan Motor on the Evaporator Cover.

3) To replace the removed parts, reverse the above removal procedure.

[b] DEFROST THERMISTOR

1) Pull out the Refrigeration Unit Base according to steps 1) through 4) of “1.

REFRIGERATION UNIT”.

2) Remove the Clip and Defrost Thermistor from the top of the Evaporator.

3) To replace the removed parts, reverse the above removal procedure.

40

[c] CLOG THERMISTOR

1) Pull out the Refrigeration Unit Base according to steps 1) through 4) of “1.

REFRIGERATION UNIT”.

2) Remove the Clip and Clog Thermistor’s element from the Condenser Outlet Pipe.

3) Cut the cable tie to disconnect the Thermistor leads.

4) To replace the removed parts, reverse the above removal procedure.

6. DOOR GASKET

[a] REMOVAL

1) Open the Door.

2) Detach the Door Gasket from the Door Pack.

[b] REPLACEMENT

1) Spray water on the Door Pack Channel with a sprayer.

2) Fit the four corners of the Door Gasket into those of the Door Pack Channel.

3) Push in each part of the Door Gasket from both sides.

Note: After fitting the Door Gasket, check every part for tightness and security.

Sprayer

Door Gasket

Door Pack

Door

41

Door Pack Channel

advertisement

Was this manual useful for you? Yes No
Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

Related manuals

advertisement

Table of contents