Panasonic CS-LE9NKD / CS-LE12NKD / CU-LE9NKD / CU-LE12NKD Service Manual ▷ View online
33
13.2 Protection Control For Cooling and Soft Dry Operation
13.2.1 Outdoor Air Temperature Control
• The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.
• This control will begin 1 minute after the compressor starts.
• Compressor frequency will adjust base on outdoor air temperature.
• Compressor frequency will adjust base on outdoor air temperature.
CS/CU-LE9NKD CS/CU-LE12NKD
13.2.2 Freeze Prevention Control
⒈
Frequency of the compressor
For prevention of freezing of the indoor evaporator, the frequency of the compressor will be changed according to
the indoor piping temperature.
⒉
Indoor Fan Control
Indoor fan speed changes according to the indoor piping temperature. In up zone shown below, the fan speed
increases by +50r/min until the indoor piping temperature reaches 9
℃
(cooling)/5
℃
(dry) or above for 5 minutes.
However, the control is unavailable within 4 minutes after compress stars up.
13.2.3 Dew Prevention Control
• To prevent dew formation at indoor unit discharge area.
• This control starts if all conditions continue for 20 minutes:
• This control starts if all conditions continue for 20 minutes:
- Operated with Cooling or Soft Dry Mode.
34
- Outdoor air temperature is less than 34
℃
.
• This control stopped if anyone of the following conditions is achieved:
- Outdoor air temperature is over 34
℃
- Intake air temperature is less than 24
℃
.
- Operation without Cooling or Soft Dry Mode.
13.2.4 Overload Protection for Cooling Operation
Frequency of compressor will change according to the outdoor piping temperature.
13.3 Indoor Piping Air Temperature Control (Heating)
13.3.1 Indoor Fan Control
1. Indoor fan is controlled by the indoor piping temperature.
●
Manual Fan Speed
Piping Temperature(
℃
)
K0
K1
K2
K3
K4
K5
K6
K7
K8
K9
K10
K11
16
19
24
32
32
36
36
39
54
54
57
60
●
Auto Fan Speed
2. During heating operation, the indoor fan will run at the following speed when the compressor stops.
2.
Normal Hot Start
When the heating operation starts, the indoor fan stops and the compressor run with a certain frequency.
This is to prevent the cold airflow from blowing.
Hot start ends when any of following condition achieves:-
This is to prevent the cold airflow from blowing.
Hot start ends when any of following condition achieves:-
Indoor piping temperature reaches 19
℃
.
Heating operation has run for over 4 minutes.
1
2
3
4
5
6
7
8
Comp.
LE9NKD
480
460
480
460
480
460
LE12NKD
420
400
420
400
420
400
Time
(Second)
(Second)
20
100
20
100
20
100
_
ON
OFF
Fan speed
(rpm)
Control by
piping
temp.
temp.
35
13.3.2 Overload Protection Control
Frequency of compressor is determined by indoor piping temperature.
36
14. Troubleshooting Guide
14.1 Refrigeration cycle system
In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle. Such
problems include insufficient insulation, problem with the power
source, malfunction of a compressor and a fan. The normal outlet air
temperature and pressure of the refrigeration cycle depends on
various conditions, the standard values for them are shown in the
table on the right.
electrical problems before inspecting the refrigeration cycle. Such
problems include insufficient insulation, problem with the power
source, malfunction of a compressor and a fan. The normal outlet air
temperature and pressure of the refrigeration cycle depends on
various conditions, the standard values for them are shown in the
table on the right.
14.1.1
Normal Pressure and Outlet Air Temperature (Standard)
Gas Pressure
Mpa
(kg/cm
Mpa
(kg/cm
2
G)
Outlet air
Temperature
(°C)
Temperature
(°C)
Cooling Mode 0.9~1.2 ( 9~12)
12~16
Heating Mode 2.3 ~2.9 (23~29)
36~45
Condition: Indoor fan speed = High
Outdoor temperature = 35°C at cooling mode and 7° C at
heating mode.
Compressor operates at rated frequency
Outdoor temperature = 35°C at cooling mode and 7° C at
heating mode.
Compressor operates at rated frequency
Different in the intake
and outlet
air temperatures
Normal
Value of electric current
during operation
Dusty condenser
preventing heat radiation
Excessive amount
of refrigerant
•
Measuring the air
temperature different
temperature different
•
Measuring electric
current during operation
current during operation
•
Measuring gas side
pressure
pressure
More than 8
°
C
(15 minutes after an operation
is started) at cooling mode.
Above 14
°
C (15 minutes after
an operation is started.) at
heating mode
Less than 8
°
C at the cooling mode
Less than 14
°
C at the heating mode
Higher than specified
Lower than
specified
specified
Gas side
pressure
pressure
Inefficient compressor
Insufficient refrigerant
Clogged strainer or
capillary cube
Cooling
Mode
High
Low
Low
Inefficient compressor
Insufficient refrigerant
Clogged strainer or
capillary cube
Heating
Mode
Low
Low
Low
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