IVT 09LR-N, Service Manual

Page: 14 / 64

12LRN
2 – 9
1.17. Difference of operation in Auto and Manual modes
In the Auto mode, the temperature setting is automatically determined based on the outside air temperature. In addition, the air to air heat pump oper-
ation differs from the operation in the Manual mode as explained below.
1.17.1 Difference relating to set temperature
1.18. Dehumidifying operation control
If the room temperature is 26

C or higher when dehumidifying opera-
tion starts, the dehumidifying operation provides a low cooling effect in
accordance with the room temperature setting automatically deter-
mined based on the outside air operation. (The setting value is the
same as the set temperature for cooling operation in the auto mode.)
If the room temperature is lower than 26

C when dehumidifying opera-
tion starts, the dehumidifying operation minimizes the lowering of the
room temperature.
1.19. Self Clean operation
Heating or Fan operation and Cluster operation are performed simulta-
neously.
The judgment of whether Heating or Fan operation is used is based on
the outside air temperature at 3 minutes after the start of internal
cleaning.
The operation stops after 40 minutes.
1.20. Plasmacluster Ion function
Plasmacluster lon generator inside the air conditioner will release pos-
itive and negative plasmacluster ions into the room. Plasmacluster
ions released into the air will reduce some airborne mold.
1.21. Hot keep
If the room temperature is in the Hot keep zone during heating, the
compressor is turned off to prevent overheating.
1.22. Winter cool
Cooling operation is available during the winter season by the built in
winter cool function.
Lower limit of outdoor temperature range is -10

C DB.
When the outside air temperature is low, the outdoor unit fan operates
at slower speed.
NOTE: Built-in protect device may work when outdoor temperature
falls below 21

C DB., depending on conditions.
1.23. Auto restart
When power failure occures, after power is recovered, the unit will
automatically restart in the same setting which were active before the
power failure.
1.23.1 Operating mode (Cool, Heat, Dry)
• Temperature adjustment (within 2

C range) automatic operation
• Temperature setting
• Fan setting
• Air flow direction
• Power ON/OFF
• Automatic operation mode setting
• Swing louvre
• Plasmacluster mode
1.23.2 Setting not memorized
• Timer setting
• Full power setting
• Self clean setting
1.23.3 Disabling auto restart function
By removing (cutting) jumper 8 (JP8) on the printed circuit board
(PCB), the auto restart function can be disabled.
1.24. Heat only mode.
Auto mode Manual mode
Cooling Heating Dehumidifying Cooling Heating Dehumidifying
Temperature
setting
method Automatic temperature setting based on outside air tem-
perature. Can be changed within

2

C using remote con-
trol.
Can be changed
between 18 and 32

C
using remote control.
Can be changed
between 18 and 32

C
using remote control.
Automatic setting.
Can be changed
within

2

C.
ZONE COM-
PRESSOR
FAN
Hot keep (When
room temperature
reaches setting tem-
perature)
OFF
AUTO
Ultra soft
(Lower than Fan
speed “soft”)
SOFT
LOW
HIGH
Keep the setting
Heating operation Fan operation
24
O
C
Outside air temperature
0.6
O
C
Set temperature
Hot keep zone
ٕ
When
㩷
heat only mode, cut the JP2 jumper
cool
䋯
heat mode
䊶䊶䊶䊶䊶䊶
JP2 connected
heat only mode
䊶䊶䊶䊶䊶䊶䊶
JP2 cut
㪤㪘㪠㪥㩷㪧㪅㪮㪅㪙㪅