Panasonic CU-XE15SKUA User manual

© Panasonic Corporation 2016.
Order No: PAPAMY1608072AE
Air Conditioner
Indoor Unit Outdoor Unit
CS-XE15SKUA CU-XE15SKUA
Destination
U.S.A.
Canada
CLOCK
AIRCO NDITIONER
OFF/ON
SET CHECK RESET
AC RC
ON
OFF
SET
123
TIMER
AUTO
COMFORT
POWERFUL /
QUIET
MODE
TEMP
FAN SPEED
AIR SWING
ECONA VI
RFP
MODE
O
FF/
O
N
C
HE
C
K
O
N
O
FF
SET
1
2
3
T
I
M
E
R
T
E
M
P
CANCEL
IMPORTANT SAFETY NOTICE
There are special components used in this equipment which are important for safety. These parts are marked by in the Schematic
Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that these critical parts should be replaced
with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of
manufacturer.
!
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the products dealt with in this service information by anyone else could result in serious injury or death.
WARNING
PRECAUTION OF LOW TEMPERATURE
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.
OPERATION MANUAL

30
12. Operation Control
12.1 Basic Function
Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time
passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating
mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and
performing temperature shifting. The compressor at outdoor unit is operating following the frequency instructed by
the microcomputer at indoor unit that judging the condition according to internal setting temperature and intake air
temperature.
12.1.1 Internal Setting Temperature
Once the operation starts, remote control setting temperature will be taken as base value for temperature shifting
processes. These shifting processes are depending on the air conditioner settings and the operation environment.
The final shifted value will be used as internal setting temperature and it is updated continuously whenever the
electrical power is supplied to the unit.
12.1.2 Cooling Operation
12.1.2.1 Thermostat control
Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -2.7°F (-1.5°C) continue for
3 minutes.
When compressor is OFF (Thermostat OFF) and AUTO FAN is set, the fan will stop periodically.
Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature >
Compressor OFF point.
12.1.3 Soft Dry Operation
12.1.3.1 Thermostat control
Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -3.6°F (-2.0°C) continue for
3 minutes.
When compressor is OFF (Thermostat OFF) and AUTO FAN is set, the fan will stop periodically.
Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature >
Compressor OFF point.
12.1.4 Heating Operation
12.1.4.1 Thermostat control
Compressor is OFF when Intake Air Temperature - Internal Setting Temperature > +3.6°F (+2.0°C) continue for
3 minutes.
Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature <
Compressor OFF point.
60.8F~86F(16C~30C)
Remote Control Setting Temperature
(Min: 60.8F(16C) ~ 91.4F(33C)
Auto Operation Mode Shifting
Indoor Air Temperature Shifting
Outdoor Air Temperature Shifting
Powerful Mode Shifting
Setting Temperature Limit Checking
Internal Setting Temperature

31
12.1.5 Automatic Operation
This mode can be set using remote control and the operation is decided by remote control setting temperature,
remote control operation mode and indoor intake air temperature.
During operation mode judgment, indoor fan motor (with speed of Lo-) is running for 30 seconds to detect the
indoor intake air temperature.
Every 10 minutes, the indoor temperature is judged.
For the 1st judgment
oIf indoor intake temperature - remote control setting temperature 3.6°F (2°C), COOL mode is decided.
oIf -3.6°F (-2°C) indoor intake temperature - remote control setting temperature < 3.6°F(2°C), DRY mode is
decided.
oIf indoor intake temperature - remote control setting temperature < -3.6°F (-2°C), HEAT mode is decided.
For the 2nd judgment onwards
oIf indoor intake temperature - remote control setting temperature 5.4°F (3°C), if previous operate in DRY
mode, then continue in DRY mode. otherwise COOL mode is decided.
oIf -3.6°F (-2°C) indoor intake temperature - remote control setting temperature < 5.4°F (3°C), maintain with
previous mode.
oIf indoor intake temperature - remote control setting temperature < -3.6°F (-2°C), HEAT mode is decided.
12.1.6 Fan Operation
Fan Operation is used to circulate air in a room.
During operation, indoor fan run continuously but outdoor fan and compressor stop.
Temperature setting is not applicable.
12.2 Indoor Fan Motor Operation
12.2.1 Basic Rotation Speed (rpm)
A. Basic Rotation Speed (rpm)
i. Manual Fan Speed
[Cooling, Dry]
Fan motor’s number of rotation is determined according to remote control setting.
Remote control żżżżż
Tab Hi Me+ Me Me- Lo
[Heating]
Fan motor’s number of rotation is determined according to remote control setting.
Remote control żżżżż
Tab SHi Me+ Me Me- Lo
-10.8
(-6)
-9.0
(-5)
-7.2
(-4)
-5.4
(-3)
-3.6
(-2)
-1.8
(-1)
0
(0)
1.8
(1)
3.6
(2)
5.4
(3)
7.2
(4)
9.0
(5)
10.8
(6)
Unit: F(C)
Heat Dr
y
Cool
-
Heat
Maintain
current mode
Cool
/Dry
-10.8
(-6)
-9.0
(-5)
-7.2
(-4)
-5.4
(-3)
-3.6
(-2)
-1.8
(-1)
0
(0)
1.8
(1)
3.6
(2)
5.4
(3)
7.2
(4)
9.0
(5)
10.8
(6) Unit: F(C)

32
ii. Auto Fan Speed
[Cooling, Dry]
According to room temperature and setting temperature, indoor fan speed is determined automatically.
When set temperature is not achieved, the indoor fan will operate according to pattern below.
When set temperature achieved, the indoor fan speed will be fixed. When thermostat off, the fan stop periodically.
[Heating]
According to indoor pipe temperature, automatic heating fan speed is determined as follows.
B. Feedback control
Immediately after the fan motor started, feedback control is performed once every second.
During fan motor on, if fan motor feedback 2550 rpm or < 50 rpm continue for 10 seconds, then fan motor error
counter increase, fan motor is then stop and restart. If the fan motor counter becomes 7 times, then H19 - fan
motor error is detected. Operation stops and cannot on back.
12.3 Outdoor Fan Motor Operation
It starts when compressor starts operation and it stops 30 seconds after compressor stops operation.
During cooling operation, and outdoor ambient temperature is below 46.4°F (8°C), outdoor fan speed will be
controlled according to outdoor piping temperature as following:
abc def gh
[1 pattern : 10 s]
ab
Higher
F
a
n
Speed
Medium
L
ower
RPM Increased
RPM Maintain
RPM Reduced
OFF
Indoor Pipe Temp.
95
o
F(35
o
C)
102.2
o
F(39
o
C)
60.8
o
F(16
o
C)
66.2
o
F(19
o
C)
ON
Compressor:
Outdoor Fan:
ON
ON
OFF
OFF
Fan Speed
30 sec
ON
OD Pipe Te
m
p.
Outdoor fan
speed increased
Outdoor fan
speed reduce
Outdoor fan
speed maintain
B
A
A -5.4°F (A -3°C)
B -5.4°F (B -3°C)

33
OD Pipe Temperature
A 78.8°F (26°C)
B 91.4°F (33°C)
During above condition, when indoor heat exchanger temperature is below 41°F (5°C), the outdoor fan will stop
according to outdoor piping temperature as following:
12.4 Airflow Direction
There are two types of airflow, vertical airflow (directed by horizontal vane) and horizontal airflow (directed by
vertical vanes).
Control of airflow direction can be automatic (angles of direction is determined by operation mode, heat
exchanger temperature and intake air temperature) and manual (angles of direction can be adjusted using
remote control).
12.4.1 Vertical Airflow
Operation Mode Airflow Direction Upper Vane Angle (°) Lower Vane Angle (°)
1 2 3 4 5 1 2 3 4 5
Heating
Auto with Heat
Exchanger
Temperature
A 25 17
B 55 37
C 25 17
Summer House 55 37
Manual 20 45 55 65 70 17 27 37 47 56
Cooling Auto 45 ~ 70 2 ~ 39
Manual 20 25 50 55 70 2 7 17 27 39
Soft Dry Auto 45 ~ 70 2 ~ 39
Manual 20 25 50 55 70 2 7 17 27 39
1. Automatic vertical airflow direction can be set using remote control; the vane swings up and down within the
angles as stated above. For heating mode operation, the angle of the vane depends on the indoor heat
exchanger temperature as Figure 1 below. It does not swing during fan motor stop. When the air conditioner is
stopped using remote control, the vane will shift to close position.
2. Manual vertical airflow direction can be set using remote control; the angles of the vane are as stated above and
the positions of the vane are as Figure 2 below. When the air conditioner is stopped using remote control, the
vane will shift to close position.
OD Pipe Temp.
Outdoor
fan OFF
Outdoor
fan ON 86°F (30°C)
122.0°F (50°C)
Upper vane: 60°
Lower vane: 58°
86.0°F (30°C)
C
B
A
Indoor Heat
Exchanger Temperature
Closed Position
Figure 1
96.8°F (36°C)
136.4°F (58°C)
Figure 2
Step 3
Step 2
Step 1
Reference point
Step 4
Step 5

34
12.4.2 Horizontal Airflow
Automatic horizontal airflow direction can be set using remote control; the vane swings left and right within the
angles as stated below. For heating mode operation, the angle of the vane depends on the indoor heat
exchanger temperature as Figure 1 below. It does not swing during fan motor stop.
Operation Mode Vane Angle (°)
Heating, with heat exchanger temperature A 65 ~115
B 90
Cooling and soft dry 65 ~115
Manual horizontal airflow direction can be set using remote control; the angles of the vane are as stated below
and the positions of the vane are as Figure 2 above.
Pattern 1 2 3 4 5
Airflow Direction Patterns at
Remote Control
Vane Angle (°) 90 65 77.5 102.5 115
12.5 Quiet operation (Cooling Mode/Cooling area of Dry Mode)
Purpose
oTo provide quiet cooling operation compare to normal operation.
Control condition
oQuiet operation start condition
When “POWERFUL/QUIET” button at remote control is pressed twice.
POWERFUL/QUIET LED illuminates.
oQuiet operation stop condition
When one of the following conditions is satisfied, quiet operation stops:
POWERFUL/QUIET button is pressed again.
Stop by OFF/ON switch.
Timer “off” activates.
AUTO COMFORT button is pressed.
ECONAVI button is pressed.
When quiet operation is stopped, operation is shifted to normal operation with previous setting.
When fan speed is changed, quiet operation is shifted to quiet operation of the new fan speed.
When operation mode is changed, quiet operation is shifted to quiet operation of the new mode.
During quiet operation, if timer “on” activates, quiet operation maintains.
After off, when on back, quiet operation is not memorised.
Control contents
oFan speed is changed from normal setting to quiet setting of respective fan speed.
Fan speed for quiet operation is reduced from setting fan speed.
12.6 Quiet Operation (Heating)
Purpose
oTo provide quiet heating operation compare to normal operation.
Control condition
oQuiet operation start condition
When “POWERFUL/QUIET” button at remote control is pressed.
POWERFUL/QUIET LED illuminates.
109.4°F (43°C)
104°F (40°C)
0° Top View
2
314
5
B: fix front
A: swing
Indoor Heat Exchanger
Temperature
Figure 1 Figure 2

35
oQuiet operation stop condition
When one of the following conditions is satisfied, quiet operation stops:
POWERFUL/QUIET button is pressed again.
Stop by OFF/ON switch.
Timer “off” activates.
AUTO COMFORT button is pressed.
ECONAVI button is pressed.
When quiet operation is stopped, operation is shifted to normal operation with previous setting.
When fan speed is changed, quiet operation is shifted to quiet operation of the new fan speed.
When operation mode is changed, quiet operation is shifted to quiet operation of the new mode, except
fan mode only.
During quiet operation, if timer “on” activates, quiet operation maintains.
After off, when on back, quiet operation is not memorised.
Control contents
oFan speed manual
Fan speed is changed from normal setting to quiet setting of respective fan speed.
Fan speed for quiet operation is reduced from setting fan speed.
oFan Speed Auto
Indoor FM RPM depends on pipe temp sensor of indoor heat exchanger.
12.7 Powerful Mode Operation
When the powerful mode is selected, the internal setting temperature will shift lower up to 3.6°F (2°C) (for
Cooling/Soft Dry) or higher up to 6.3°F (3.5°C) (for Heating) than remote control setting temperature for
20 minutes to achieve the setting temperature quickly.
12.8 Timer Control
There are 2 sets of ON and OFF timer available to turn the unit ON or OFF at different preset time.
If more than one timer had been set, the upcoming timer will be displayed and will activate in sequence.
12.8.1 ON Timer Control
ON timer 1 and ON timer 2 can be set using remote control, the unit with timer set will start operate earlier than
the setting time.
This is to provide a comfortable environment when reaching the set ON time.
60 minutes before the set time, indoor (at fan speed of Lo-) and outdoor fan motor start operate for 30 seconds to
determine the indoor intake air temperature and outdoor air temperature in order to judge the operation starting
time.
From the above judgment, the decided operation will start operate earlier than the set time as shown below.
12.8.2 OFF Timer Control
OFF timer 1 and OFF timer 2 can be set using remote control, the unit with timer set will stop operate at set time.
12.9 Auto Restart Control
When the power supply is cut off during the operation of air conditioner, the compressor will re-operate within
three to four minutes (there are 10 patterns between 2 minutes 58 seconds and 3 minutes 52 seconds to be
selected randomly) after power supply resumes.
This type of control is not applicable during ON/OFF Timer setting.
This control can be omitted by open the circuit of JP1 at indoor unit printed circuit board.
Indoo
r
intak
e
ai
r
temperature
o
F(
o
C)
Outdoor air
temperature
o
F(
o
C)
86 (30)
86 (30) 95 (35)
Cooling/Soft Dry
10 min
15 min
5min
77 (25)
Indoo
r
intak
e
ai
r
temperature
o
F(
o
C)
Outdoor air
temperature
o
F(
o
C)
59 (15)
32 (0) 41 (5)
Heating
30 min
25 min
35 min
41 (5)

36
12.10 Indication Panel
LED POWER TIMER POWERFUL/QUIET RFP ECONAVI AUTO COMFORT
Color Green Orange Orange Green Green Green
Light ON Operation ON Timer Setting ON POWERFUL/QUIET
Mode ON RFP ON ECONAVI ON AUTO COMFORT
ON
Light OFF Operation OFF Timer Setting OFF POWERFUL/QUIET
Mode OFF RFP OFF ECONAVI OFF AUTO COMFORT
OFF
Note:
If POWER LED is blinking, the possible operation of the unit are Hot Start, during Deice operation, operation
mode judgment, or ON timer sampling.
If Timer LED is blinking, there is an abnormality operation occurs.
12.11 Room Freeze Protection Function (RFP) Operation
When the RFP is selected, the unit will operate the fan at high speed for proper room temperature monitoring.
When the sensor detects that the room temperature has dropped below 46°F / 8°C, the compressor/heat pump
operation begins.
When the room temperature reaches 50°F / 10°C, the unit shuts off, then will repeat continuously if the
temperature drops below 46°F / 8°C again.
<Disclaimer>
This function may not be performed if the unit is not energized, or under a certain condition that unit is unable to
operate such as in protection mode. Please consult with the HVAC installers or professional for details.
The Room Freeze Protection function (RFP) cannot be used unless the unit is energized and set into the RFP
mode.
In the advent of a power failure this mode will not function. During the RFP mode, POWERFUL OPERATION,
QUIET OPERATION and FAN SPEED selection are all disabled. Please consult with your HVAC installer or
professional for more details.
12.12 AUTO COMFORT and ECONAVI Operation
Area of human availability, activity level and absent is judged based on pulses by using 2 infrared sensors. The
internal setting temperature shift, fan speed and horizontal airflow direction are adjusted in order to provide
comfort environment while maintain the energy saving level.
AUTO COMFORT start condition:
oWhen AUTO COMFORT button is pressed.
AUTO COMFORT stop conditions:
oWhen AUTO COMFORT button is pressed again.
oWhen unit is OFF by OFF/ON button.
oWhen unit is OFF when OFF TIMER activates.
oWhen unit is OFF by AUTO OFF/ON button at indoor unit.
oWhen POWERFUL, QUIET operation activates.
oWhen AIR SWING ŻŹ button is pressed.
ECONAVI start condition:
oWhen ECONAVI button is pressed.
ECONAVI stop conditions:
oWhen ECONAVI button is pressed again.
oWhen unit is OFF by OFF/ON button.
oWhen unit is OFF when OFF TIMER activates.
oWhen unit is OFF by AUTO OFF/ON button at indoor unit.
oWhen POWERFUL, QUIET operation activates.
oWhen AIR SWING ŻŹ button is pressed.

37
12.12.1 Human Activity Sensor
Area of human availability, activity level and absent is judged based on pulses by using infrared sensor. The
internal setting temperature shift, fan speed and horizontal airflow direction are adjusted in order to provide
comfort environment while maintain the energy saving level.
Human activity judgment is as following:
12.12.1.1 Signal Detection
Presumption flow of human position.
oDetection outline.
12.12.1.2 Information Log
The signal from Infrared sensors will be log to human activity database for further analysis.
12.12.1.3 Human Activity Level Judgment
Human Activity Level is judged based on the frequency of pulses detected by the infrared sensors within a
timeframe. The activity level will be categorized into High, Normal, Low level.
When a pulse is detected within this timeframe, the status of human presence is judged.
When there is no signal detection continues for 40 minutes or more, the status of human absence is judged.
Signal Detection
Information Log
Human Activity Level Judgment
Determination of Presence or Absence
C
B
A
120°
23 ft (7m)
6.6ft (2m)
23ft (7m)
Human Sensor Motion Check Sensor move to left and
right and detection area
(A, B, C) output frequency
is detected
Check Installation Position and Detection Area
Human Sensor STM move
Fixed Detection
Process Detection Result
Determination of fixed
detection area and its order
(Fixed detection i
s
continued until it
measures all the
detection area)

38
12.12.1.4 Determination of Presence or Absence
Human presence status shall be determined based on the human presence status of each area.
When all area has been detected absent for more than 40 minutes then it will judge as absence.
12.12.1.5 Setting Temperature and Fan Speed Shift
* During low activity, fan speed 1 tap up for first 15 minutes or until set temperature is reached.
** During human absence, maximum fan speed for COOL/DRY mode is medium fan.
12.12.1.6 ECONAVI and AUTO COMFORT Demo Mode
To enable ECO DEMO mode:
To disable ECO Demo MODE:
oTransmit ECO Demo signal again.
Low activity Normal activity
Human
Mode
Set
temperature
High activity Absent
ECONA
V
I; Detecting human presence and activity, the unit controls room temperature to save energy.
Low activity Normal activity
Human
Mode
Set
temperature
High activity Absent
Set
Fan Speed
A
UTO COMFORT ; Detecting human presence and activity, the unit controls room temperature to keep human
comfortable consistently.
HEAT
COOL/DRY
HEAT
COOL/DRY
+1 tap
+1 tap*
+2°F / +1°C
+2°F / +1°C
+0.5°F / +0.3°C
-2°F / -1°C
-4°F / -2°C
+4°F / +2°C
-4°F / -2°C
-4°F / -2°C
+4°F / +2°C
-4°F / -2°C
SET
Transmit ECO demo code and
after 30 seconds return to normal
mode.
Press continously for 5s
Transmit check code
and after 30 seconds return to normal
mode.
Transmit sunlight sensor check code
and after 30 seconds return to normal
mode.
Remote control normal mode