SPLIT TYPE
ROOM AIR CONDITIONER
WALL MOUNTEDtype
INVERTER
SERVICE INSTRUCTION
Models Indoor unit |
Outdoor unit |
ASU09RL2 |
AOU09RL2 |
ASU12RL2 |
AOU12RL2 |
R410A
CONTENTS
1. DESCRIPTION OF EACH CONTROL OPERATION
1. COOLING OPERATION................................................................................................ |
01-01 |
2. HEATING OPERATION................................................................................................. |
01-02 |
3. DRY OPERATION......................................................................................................... |
01-02 |
4. AUTO CHANGEOVER OPERATION............................................................................ |
01-03 |
5. INDOOR FAN CONTROL.............................................................................................. |
01-04 |
6. OUTDOOR FAN CONTROL.......................................................................................... |
01-06 |
7. LOUVER CONTROL..................................................................................................... |
01-07 |
8. COMPRESSOR CONTROL.......................................................................................... |
01-08 |
9. TIMER OPERATION CONTROL................................................................................... |
01-09 |
10. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )................................. |
01-11 |
11. FOUR-WAY VALVE EXTENSION SELECT................................................................ |
01-11 |
12. AUTO RESTART......................................................................................................... |
01-11 |
13. MANUAL AUTO OPERATION ( Indoor unit body operation )..................................... |
01-11 |
14. FORCED COOLING OPERATION.............................................................................. |
01-12 |
15. COMPRESSOR PREHEATING.................................................................................. |
01-12 |
16. ECONOMY OPERATION............................................................................................ |
01-12 |
17. POWERFUL OPERATION.......................................................................................... |
01-12 |
18. DEFROST OPERATION CONTROL........................................................................... |
01-13 |
19. OFF DEFROST OPERATION CONTROL................................................................... |
01-15 |
20. VARIOUS PROTECTIONS.......................................................................................... |
01-16 |
2. TROUBLE SHOOTING
2-1 ERROR DISPLAY....................................................................................................... |
02-01 |
2-2 TROUBLE SHOOTING WITH ERROR CODE............................................................ |
02-02 |
2-3 TROUBLE SHOOTING WITH NO ERROR CODE..................................................... |
02-21 |
2-4 SERVICE PARTS INFORMATION.............................................................................. |
02-26 |
3. APPENDING DATA
3-1 FUNCTION SETTING................................................................................................. |
03-01 |
3-1-1 INDOOR UNIT.................................................................................................... |
03-01 |
3-1-2 Procedures to change the Function Setting for wireless RC.............................. |
03-03 |
3-2 Thermistor Resistance Values..................................................................................... |
03-06 |
3-2-1 INDOOR UNIT.................................................................................................... |
03-06 |
3-2-2 OUTDOOR UNIT................................................................................................ |
03-06 |
R410A
WALL MOUNTED type
INVERTER
1 . DESCRIPTION OF EACH CONTROL OPERATION
1. COOLING OPERATION
A sensor (room temperature thermistor) built in the indoor unit body will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor.
*If the room temperature is 2°C(4°F) higher than a set temperature, the compressor operation frequency will attain to maximum performance.
*If the room temperature is some degrees lower than a set temperature,
the compressor will be stopped.
* When the room temperature is between +2°C(4°F) to -2.5°C(-5°F) of the setting temperature, the compressor frequency is controlled within the range shown in Table1.
However, the maximum frequency is limited in the range shown in Fig.1 based on the indoor fan mode and the outdoor temperature.
( Table 1 : Compressor frequency range ) |
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Minimum |
Maximum |
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Maximum |
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frequency |
frequency |
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frequency |
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AOU09RL2 |
18rps |
57rps |
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80rps |
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AOU12RL2 |
80rps |
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96rps |
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When the compressor operates for 30 minutes continuously at over the maximum frequency , |
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the maximum frequency is changed from Maximum Frequency |
to Maximum Frequency. |
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( Fig.1 : Outdoor temperature zone ) |
( Table 2 : Limit of maximum speed based on outdoor temperature ) |
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When the outdoor |
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Outdoor |
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Indoor fan mode |
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When the outdoor |
temperature rises |
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temp. zone |
Hi |
Me |
Lo |
Quiet |
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ASU09RL2 |
A zone |
80rps |
49rps |
42rps |
32rps |
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temperature drops |
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36°C |
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B zone |
80rps |
49rps |
42rps |
32rps |
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A zone |
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(97°F) |
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C zone |
80rps |
49rps |
42rps |
32rps |
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34°C |
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D zone |
49rps |
44rps |
40rps |
29rps |
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32°C |
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(93°F) |
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E zone |
49rps |
44rps |
40rps |
29rps |
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30°C |
B zone |
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(90°F) |
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F zone |
49rps |
44rps |
40rps |
29rps |
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21°C |
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ASU12RL2 |
A zone |
96rps |
61rps |
51rps |
33rps |
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(86°F) |
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B zone |
96rps |
61rps |
51rps |
33rps |
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C zone |
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(70°F) |
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19°C |
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C zone |
96rps |
61rps |
51rps |
33rps |
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12°C |
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D zone |
73rps |
57rps |
45rps |
33rps |
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(66°F) |
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E zone |
73rps |
57rps |
45rps |
33rps |
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D zone |
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(54°F) |
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10°C |
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F zone |
73rps |
57rps |
45rps |
33rps |
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2°C |
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(50°F) |
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0°C |
E zone |
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(36°F) |
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(32°F) |
F zone |
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01-01
2. HEATING OPERATION
A sensor (room temperature thermistor) built in the indoor unit body will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor.
*If the room temperature is lower by 3°C (6°F) than a set temperature, the compressor operation frequency will attain to maximum performance.
*If the room temperature is some degrees higher than a set temperature,
the compressor will be stopped.
*When the room temperature is between +2.5°C (+5°F) to -3°C (-6°F) of the setting temperature, the compressor frequency is controlled within the range shown in Table 3.
However, the maximum frequency is limited shown in Table 4 based on the fan mode.
( Table 3 : Compressor frequency range )
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Minimum |
Maximum |
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frequency |
frequency |
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AOU09RL2 |
18rps |
80rps |
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AOU12RL2 |
120rps |
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( Table 4 : Limit of maximum speed based on outdoor temperature )
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Indoor fan mode |
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Hi |
Me |
Lo |
Quiet |
Auto |
AOU09RL2 |
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80rps |
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AOU12RL2 |
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120rps |
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3. DRY OPERATION
The compressor frequency shall change according to the temperature, set temperature,
and room temperature variation which the room temperature sensor of the indoor unit body has detected as shown in the Table 5.
However, after the compressor is driven, the indoor unit shall run at operation frequency of (09 : 52 rps, 12 : 61 rps) for 60 seconds.
( Table 5 : Compressor frequency in Dry mode)
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Operating |
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frequency |
AO09RL2 |
X zone |
30rps |
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J zone |
28rps |
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Y zone |
0rps |
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Operating |
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frequency |
AO12RL2 |
X zone |
33rps |
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J zone |
25rps |
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Y zone |
0rps |
( Fig.2 : Compressor control based on room temperature )
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When the room |
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When the room |
temperature rises |
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temperature drops |
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Ts+1.5°C (Ts+3°F) |
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Ts+0.5°C (Ts+1°F) |
X zone |
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Ts -0.5°C (Ts-1°F) |
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Ts -1.5°C (Ts-3°F) |
J zone |
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Y zone |
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01-02
4. AUTO CHANGEOVER OPERATION
When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum mode from among the Heating, Cooling, Dry and Monitoring modes.
During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set between 18°C (64°F) and 30°C (88°F) in 1°C (2°F) steps.
(Fig. 3 : Operation flow chart in Auto changeover)
START
NO
YES
YES
Room temp. |
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YES |
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>Ts+2°C |
(4°F) |
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NO |
TS : Setting temperature |
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Room temp. <Ts- 2°C(4°F) ?
YES
HEATING OPERATION |
COOLING OPERATION |
Thermostat remains |
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Thermostat remains |
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in OFF state for 6 minutes or |
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in OFF state for 6 minutes or |
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longer? |
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longer? |
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NO |
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NO |
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System stops |
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System stops |
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or operation command other than |
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or operation command other than |
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auto changeover operation? |
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auto changeover operation? |
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NO |
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YES
YES
01-03
5. INDOOR FAN CONTROL
1. Fan speed
( Table 6 : Indoor fan speed )
Operation mode |
Air flow mode |
Speed (rpm) |
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ASU09RL2 |
ASU12RL2 |
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Heating |
Powerful |
1420 |
1420 |
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Hi |
1360 |
1360 |
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Me+ |
1290 |
1290 |
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Me |
1120 |
1120 |
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Lo |
900 |
900 |
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Quiet |
700 |
700 |
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Cool air prevention |
600 |
600 |
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S-Lo |
480 |
480 |
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Cooling/ Fan |
Powerful |
1400 |
1400 |
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Hi |
1320 |
1320 |
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Me |
1120 |
1120 |
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Lo |
840 |
860 |
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Quiet |
700 |
700 |
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* Soft Quiet |
600 |
600 |
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Dry |
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X zone: 700 |
X zone: 700 |
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J zone: 600 |
J zone: 600 |
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*Note, during Economy operation and operation mode is Fan, air flow is 1 step downs. (Hi > Me, Me > Lo, Lo > Quiet, Quiet > Soft Quiet)
2. FAN OPERATION
The airflow can be switched in 5 steps such as Auto, Quiet, Lo, Me, Hi, while the indoor fan only runs. When fan mode is set at [Auto], it operates on [Me] fan Speed.
3. COOLING OPERATION
Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature, as shown in Fig4. On the other hand, if switched in [Hi]
[Quiet], the indoor motor will run at a constant airflow of [Cool] operation modes Quiet, Lo, Me, Hi, as shown in Table 6.
( Fig.4 : Airflow change - over ( Cooling : Auto ) )
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When the room |
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When the room |
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temperature rises |
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temperature drops |
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TR-Ts > 2.5°C (5°F) |
TR : Room temperature |
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TR-Ts > 2°C (4°F) |
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Hi mode |
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Ts : Setting temperature |
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2.5°C (5°F) > TR-Ts > 1.5°C (3°F) |
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2°C (4°F) > TR-Ts > 1°C (2°F) |
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Me mode |
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Lo mode |
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1.5°C (3°F) > TR-Ts |
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1°C (2°F) > TR-Ts |
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4. DRY OPERATION
Refer to the Table 6.
During the dry mode operation, the fan speed setting can not be changed.
01-04
5. HEATING OPERATION
Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature, as shown in Fig. 5 On the other hand, if switched in [Hi] [Quiet], the indoor motor will run at a constant airflow
of [Heat] operation modes Quiet, Lo, Me, High, as shown in Table 6. ( Fig.5 : Airflow change - over ( Heating : Auto ) )
When the room |
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When the room |
TR : Room temperature |
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temperature drops |
Ts : Setting temperature |
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TR-Ts > -1°C (-2°F) |
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TR-Ts > -1.5°C (-3°F) |
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-1°C (-2°F) > TR-Ts > -2°C (-4°F) |
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Me mode |
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-1.5°C (3°F) > TR-Ts > -2.5°C (-5°F) |
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-2°C (-4°F) > TR-Ts |
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Me+ mode |
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-2.5°C (-5°F) > TR-Ts |
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6. COOL AIR PREVENTION CONTROL (Heating mode)
The maximum value of the indoor fan speed is set as shown in Fig.6 based on the detected temperature by the indoor heat-exchanger sensor on heating mode.
( Fig.6 : Cool air prevension control ) |
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<Normal operation> |
<Powerful operation> |
When the Indoor heat |
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When the Indoor heat |
When the Indoor heat |
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exchanger temp. rises |
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exchanger temp. drops |
exchanger temp. rises |
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* Hi or setting |
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42°C |
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42°C (108°F) |
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Fan mode |
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37°C (99°F) |
(108°F) |
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* Me+ or setting |
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39°C |
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39°C (102°F) |
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Fan mode |
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(102°F) |
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37°C |
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* Lo or setting |
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34°C (93°F) |
(99°F) |
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37°C (99°F) |
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Fan mode |
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30°C |
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Cool air |
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32°C (90°F) |
(86°F) |
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30°C (86°F) |
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prevention |
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S-Lo |
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28°C (82°F) |
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When the Indoor heat |
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exchanger temp. drops |
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Powerful |
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Hi |
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37°C |
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(99°F) |
Lo |
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34°C |
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Cool air |
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(93°F) |
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32°C |
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prevention |
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(90°F) |
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S-Lo |
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28°C |
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(82°F) |
* Lower speed is selected.
*Lower speed is selected.
7.MOISTURE RETURN PREVENTION CONTROL (Cooling mode& Dry mode)
Switch the airflow [Auto] at cooling mode, and the indoor fan motor will run as shown in Fig.7.
( Fig.7 : Indoor fan control )
Compressor ON 
OFF
Indoor fan
Setting air flow
Indoor fan
(as shown in Table 7)
S-Lo |
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OFF |
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10 |
30 |
60 |
180 |
60 |
180 |
60 |
10 |
30 |
(sec)
( Table 7 : Indoor fan speed )
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Dry |
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Cooling |
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X zone |
J zone |
Y zone |
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ASU09/12RL2 |
700rpm |
600rpm |
0 480rpm |
700rpm |
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01-05
6. OUTDOOR FAN CONTROL
1. Outdoor Fan Motor
Following table shows the type of the outdoor fan motor. The control method is different between AC motor and DC motor.
( Table 8 : Type of Motor )
AC motor DC motor
AOU09RL2
AOU12RL2
2. Fan Speed
( Table 9 : Outdoor fan speed )
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Zone |
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Cooling |
Heating |
Dry |
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Y |
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730 / 650 / 470 |
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AOU09RL2 |
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Z |
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730 / 470 / 360 |
900 / 650 / 470 |
730 / 470 |
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F |
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360 / 150 |
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G |
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210 / 150 |
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Y |
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860 / 760 / 470 |
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AOU12RL2 |
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Z |
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860 / 470 / 380 |
900 / 760 / 680 / 470 |
760 / 470 |
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F |
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380 / 280 |
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G |
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280 / 200 |
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Refer to Fig.8 |
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( Fig.8 : Outside air temperature zone selection ) |
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Outside air |
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Outside air |
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temperature |
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temperature |
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21°C (70°F) |
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Y zone |
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19°C (66°F) |
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Z zone |
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12°C (54°F) |
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F zone |
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10°C (50°F) |
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2°C (36°F) |
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G zone |
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0°C (32°F) |
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*The outdoor fan speed mentioned adove depends on the compressor frequency.
(When the compressor frequency increases, the outdoor fan speed also changes to the higher speed. When the compressor frequency decreases, the outdoor fan speed also changes to the lower speed.)
*After the defrost control is operated on the heating mode, the fan speed keeps at the higher speed as table 10 without relating to the compressor frequency.
( Table 10 : Outdoor fan speed after the defrost )
AOU09RL2 |
900 rpm |
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AOU12RL2 |
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01-06
7. LOUVER CONTROL
1. VERTICAL LOUVER CONTROL
(Function Range)
Each time the button is pressed, the air direction range will change as follow:
Types of Air flow Direction Setting:
,
,
,
: During Cooling/Dry modes
,
,
,
: During Heating
The Remote Controller's display does not change.
Use the air direction adjustments within the ranges shown above.
Fig.8 : Air Direction Range
1 
2
3
4 5 6 7
The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.
Cooling / Dry mode |
Horizontal flow |
Heating mode |
Downward flow |
If you set the angle to position 
~
for more than 30 minutes in Cooling or Dry mode, they automatically return to position
.
In Cooling or Dry mode, if the angle is set to position
~
for many hours, condensation may be formed, and the drips may wet your property.
2. ADJUST THE RIGHT-LEFT LOUVERS
Move the Right-Left louvers to adjust air flow in the direction you prefer.
Right-Left Louvers
Knob
Knob (2 places)
3. SWING OPERATION
To select Vertical Airflow Swing Operation
When the swing signal is received from the remote controller, the vertical louver starts to swing. (Table10 : Swinging Range)
Range
Cooling / Dry mode
Fan mode (
)
Heating mode |
) |
Fan mode ( |
The SWING operation may stop temporarily when the air conditioner’s fan is not operating, or when operating at very low speeds.
To select Horizontal Airflow Swing Operation
(No function)
01-07
8.COMPRESSOR CONTROL
1.OPEARTION FREQUENCY RANGE
The operation frequency of the compressor is different based on the operation mode as shown in the Table 11.
(Table 11 : Compressor frequency range)
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Cooling / Dry |
Heating |
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Minimum |
Maximum |
Minimum |
Maximum |
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AOU09RL2 |
18rps |
80rps |
18rps |
120rps |
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AOU12RL2 |
96rps |
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2.OPEARTION FREQUENCY CONTROL AT NORMAL START UP
The compressor frequency soon after the start-up is controlled as shown in the Fig.9.
(Fig.9 : Compressor control at start-up)
Frequency |
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Frequency |
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Frequency |
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Frequency |
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Frequency |
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Frequency |
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Time |
Time |
Time |
Time |
Time |
Time 6 |
(Frequency) |
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Frequency
Frequency
Frequency
Frequency
Frequency
Frequency
AOU09RL2 |
56rps |
67rps |
75rps |
78rps |
78rps |
78rps |
AOU12RL2 |
56rps |
74rps |
87rps |
97rps |
108rps |
119rps |
(Time) |
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Time |
Time |
Time |
Time |
Time |
Time 6 |
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AOU09RL2 |
80sec |
140sec |
200sec |
380sec |
440sec |
440sec |
AOU12RL2 |
60sec |
100sec |
140sec |
200sec |
350sec |
410sec |
3.LIMITATION OF COMPRESSOR FREQUENCY BY OUTDOOR TEMPERATURE
The minimum compressor frequency is limited by outdoor temperature as shown in the Table12.
(Table12 : Limitation of Compressor Frequency)
[ Cooling/ Dry ]
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10°C (50°F) |
14°C (59°F) |
40°C (104°F) |
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Under |
Over |
Under |
Over |
Under |
Over |
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AOU09RL2 |
35rps |
23rps |
------- |
30rps |
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AOU12RL2 |
45rps |
27rps |
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[ Heating ] |
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- 3°C (26°F) |
7°C (45°F) |
14°C (59°F) |
40°C (104°F) |
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Under |
Over |
Under |
Over |
Under |
Over |
Under |
Over |
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AOU09RL2 |
34rps |
22rps |
27rps |
------- |
30rps |
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AOU12RL2 |
36rps |
27rps |
27rps |
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01-08
9. TIMER OPEARTION CONTROL
9-1 WIRELESS REMOTE CONTROLLER
The Table 13 shows the available timer setting based on the product model. ( Table 13 : Timer Setting )
ON TIMER / OFF TIMER PROGRAM TIMER |
SLEEP TIMER |
ASU09RL2
ASU12RL2
1. OPEARTION FREQUENCY RANGE
OFF timer : When the clock reaches the set time, the air conditioner will be turned off.
Operation mode
Stop mode
Set time of timer
ON timer : When the clock reaches the set time, the air conditioner will be turned on.
Operation mode
Stop mode
Set time of timer
2. PROGRAM TIMER
The program timer allows the OFF timer and ON timer to be used in combination one time.
Operation mode |
Operation mode |
Operation mode |
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Stop mode |
Stop mode |
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Stop mode |
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Set time |
Set time |
Set time |
Set time |
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Operation will start from the timer setting (either OFF timer or ON timer) whichever is closest to the clock's current timer setting.
The order of operations is indicated by the arrow in the remote control unit's display. 
SLEEP timer operation cannot be combined with ON timer operation.
01-09
3. SLEEP TIMER
If the sleep is set, the room temperature is monitored and the operation is stopped automatically. If the operation mode or the set temperature is change after the sleep timer is set, the operation is continued according to the changed setting of the sleep timer from that time ON.
In the cooling operation mode
When the sleep timer is set, the setting temperature is increased 1°C (2°F). It increases the setting temperature another 1°C (2°F) after 1 hour.
After that, the setting temperature is not changed and the operation is stopped at the time of timer setting.
|
Set temperature rises |
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( Ts : Set temperature ) |
+2°C (4°F) |
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+1°C (2°F) |
Stop of operation |
Ts |
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Set 60min
In the heating operation mode
When the sleep timer is set, the setting temperature is decreased 1°C (2°F). It decreases the setting temperature another 1°C (2°F) every 30 minutes.
Upon lowering 4°C (8°F), the setting temperature is not changed and the operation stops at the time of timer setting.
Set temperature lowers ( Ts : Set temperature )
Ts
-1°C (-2°F)
-2°C (-4°F)
-3°C (-6°F)
-4°C (-8°F)
Stop of operation Set 30min 30min 30min
01-10
10. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )
The compressor won't enter operation status for 2 minutes and 20 seconds after the compressor is stopped, even if any operation is given.
11. FOUR-WAY VALVE EXTENSION SELECT
At the time when the air conditioner is switched from the cooling mode to heating mode, the compressor is stopped, and the four-way valve is switched in 2 minutes and 20 seconds later after the compressor stopped.
12. AUTO RESTART
When the power was interrupted by a power failure, etc. during operation, the operation contents at that time are memorized and when power is recovered, operation is automatically started with the memorized operation contents.
When the power is interrupted and recovered during timer operation, since the timer operation time is shifted by the time the power was interrupted, an alarm is given by blinking (7 sec ON/2 sec OFF) the indoor unit body Timer lamp.
[ Operation contents memorized when the power is interrupted ]
Operation mode
Set temperature
Set air flow
Timer mode and set time
Set air flow Direction
Swing
ECONOMY operation
13. MANUAL AUTO OPERATION (Indoor unit body operation)
When the remote control is lost or battery power dissipated, this function will work without the remote control. When MANUAL AUTO button is set more than 3seconds and less than 10seconds, MANUAL AUTO OPERATION will be started as shown in Table14.
To stop operation, press the MANUAL AUTO button for 3seconds.
(Table14 : MANUAL AUTO OPERATION)
|
Manual auto operation |
OPERATION MODE |
Auto changeover |
FAN CONT. MODE |
Auto |
TIMER MODE |
Continuous (No timer setting available) |
SETTING TEMP. |
24°C (75°F) |
SETTING LOUVER |
Standard |
SWING |
OFF |
ECONOMY |
OFF |
Press and hold MANUAL AUTO button for 3 ~ 10seconds
01-11
14. FORCED COOLING OPERATION (TEST OPERATION)
When FORCED COOLING OPERATION is set, the operation is controlled as shown in Table15. ( Table15 : FORCED COOLING OPERATION )
|
Forced cooling operation |
OPERATION MODE |
Cooling |
FAN CONT. MODE |
Hi |
TIMER MODE |
- |
SETTING TEMP. |
Room Temp is not controlled |
SETTING LOUVER |
Horizontal |
|
(It is changed follow as setting of remote controller) |
SWING |
OFF |
ECONOMY |
- |
Forced cooling operation is started when press MANUAL AUTO button for 10 seconds or more.
During the forced cooling operation, it operates regardless of room temperature sensor.
Operation lamp and Timer lamp blink at the same time during the forced cooling operation.
They blink for 1 second ON and 1 second OFF on both Operation lamp and Timer lamp (same as test operation).
Forced cooling operation is released after 60 minutes of starting operation or pressing MANUAL AUTO button for 3 seconds or pressing START/STOP button on the remote controller.
15. COMPRESSOR PREHEATING
When the outdoor heat exchanger temperature is lower than 5°C and the all operation has been stopped for 30 minutes, power is applied to the compressor and the compressor is heated. (By heating the compressor, warm air is quickly discharged when operation is started.)
When operation was started, and when the outdoor temperature rises to 7°C (44.6°F) or greater, preheating is ended.
16. ECONOMY OPERATION
The ECONOMY operation functions by pressing ECONOMY button on the remote controller.
At the maximum output, ECONOMY Operation is approximately 70% of normal air conditioner operation for cooling and heating.
The ECONOMY operation is almost the same operation as below settings. ( Table 16 )
Mode |
Cooling/ Dry |
Heating |
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Target temperature |
Setting temp.+1°C (2°F) |
Setting temp.-1°C (-2°F) |
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17. POWERFUL OPERATION
The POWERFUL OPERATION functions by pressing POWERFUL button on the remote controller. The indoor unit & outdoor unit will operate at maximum power as shown in Table17.
(Table17)
|
Powerful operation |
COMPRESSOR FREQUENCY |
Maximum |
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FAN CONT. MODE |
Powerful |
SETTING LOUVER |
Cooling/ Dry : 3, Heating : 5 |
Release Condition is as follows. [Cooling / Dry]
- Room temperature < Setting temperature - 1.5°C (-3°F) or Operation time has passed 20 minutes.
=
[Heating]
- Room temperature > Setting temperature +1.5°C (+3°F) or Operation time has passed 20 minutes.
=
01-12
18. DEFROST OPERATION CONTROL
1.CONDITION OF STARTING THE DEFROST OPERATION
The defrost operation starts as shown in the following Table 18.
(Table 18 : Condition of starting Defrost Operation)
Normal defrost |
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Compressor integrating operation time |
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Less than 25 minutes |
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More than 25 minutes |
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Outdoor heat exchanger temp. < -17°C (1.4°F) |
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Does not operate |
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= |
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(at outside air temp. > -10°C (14°F)) |
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= |
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Outdoor heat exchanger temp. < Outside air temp. |
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- 7°C (-44.6°F) |
= |
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or Outdoor heat exchanger temp. < - 20°C (-13°F) |
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= |
(14°F)) |
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(at outside air temp. < -10°C |
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Integrating defrost |
Compressor integrating operation time |
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More than 240 minutes |
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More than 213 minutes |
Less than 10 minutes |
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(For continuous operation) |
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(For continuous operation) |
( For intermittent operation ) |
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Outdoor heat exchanger |
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Outdoor heat exchanger |
OFF count of the compressor |
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temperature below -3°C (-6°F) |
temperature below -5°C (-10°F) |
40 times |
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If the compressor continuous operation time is less than 10 minutes, the OFF number of the compressor is counted.
If any defrost operated, the compressor OFF count is cleared.
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Defrost operation is released when the conditions become as shown in Table 19. (Table 19 : Defrost Release Condition)
Release Condition
Outdoor heat exchanger temperature sensor value is higher than +16°C (60.8°F) or
Compressor operation time has passed 15 minutes.
01-13
3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature and outdoor heat exchanger temperature as follows.
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Heating operation start : Compressor ON |
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(Not defrosted for 10 minutes) |
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Normal |
defrost |
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Integrating |
defrost |
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Outside air temp. > -10°C |
Outside air |
temp. < -10°C |
Intermittent |
operation |
Continuous operation |
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= (14°F) |
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(14°F) |
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Outdoor HEX temp. |
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Outdoor HEX temp. |
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Compressor |
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Compressor |
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Compressor |
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Below - 17°C(1.4°F) |
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- Outside air temp. |
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OFF count : |
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integrating |
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integrating |
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Below - 7°C(-44.6°F) |
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40 times |
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operation: |
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operation: |
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or |
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(Less than 10min.) |
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Over 240 min. |
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Over 213 min. |
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Outdoor HEX temp. |
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Below - 20°C(-4°F) |
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Outdoor |
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Outdoor |
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heat exchanger |
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heat exchanger |
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temperature: |
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temperature: |
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Below - 3°C |
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Below - 5°C |
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(26.6°F) |
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(23°F) |
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Defrost start
Defrost Indicator: [Operation lamp]
7 sec ON / 2 sec OFF
Outdoor fan : OFF
Compressor speed : 0 rps
4-way valve : OFF
Compressor speed : 90rps
Outdoor HEX temp.: Over 16°C (60.8°F) or
Compressor ON time: Maximum 15 minutes
Defrost end
01-14
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