Specifications

Installation and operation manual
54
RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
Adjustment
For programming temperature, fan speed and air flow direction refer
to the operation manual of the user interface.
Stopping the system
3 Press the ON/OFF button on the user interface once again.
The operation lamp goes out and the system stops operating.
6.1.3. Explanation of heating operation
It may take longer to reach the set temperature for general heating
operation than for cooling operation.
The following operation is performed in order to prevent the heating
capacity from dropping or cold air from blowing.
Defrost operation
 In heating operation, freezing of the outdoor unit's air cooled coil
increases over time, restricting the energy transfer to the
outdoor unit's coil. Heating capability decreases and the system
needs to go into defrost operation to be able to deliver enough
heat to the indoor units: the indoor unit will stop fan operation,
the refrigerant cycle will reverse and energy from inside the
building will be used to defrost the outdoor unit coil.
 The indoor unit will indicate defrost operation on the displays
.
Hot start
 In order to prevent cold air from blowing out of an indoor unit at
the start of heating operation, the indoor fan is automatically
stopped. The display of the user interface shows . It
may take some time before the fan starts. This is not a
malfunction.
6.2. Program dry operation
 The function of this program is to decrease the humidity in your
room with minimal temperature decrease (minimal room
cooling).
 The micro computer automatically determines temperature and
fan speed (cannot be set by the user interface).
 The system does not go into operation if the room temperature
is low (<20°C).
6.2.1. For systems without cool/heat changeover remote
control switch
Starting the system
1 Press the operation mode selector button on the user interface
several times and select (program dry operation).
2 Press the ON/OFF button of the user interface. The operation
lamp lights up and the system starts operating.
3 Press the air flow direction adjust button (only for Double-flow,
Multi-flow, Corner, Ceiling-suspended and Wall-mounted). Refer
to "6.3. Adjusting the air flow direction" on page 54 for details.
Stopping the system
4 Press the ON/OFF button of the user interface once again. The
operation lamp goes out and the system stops operating.
6.2.2. For systems with cool/heat changeover remote control
switch
Starting the system
1 Select cooling operation mode with the cool/heat changeover
remote control switch.
2 Press the operation mode selector button on the user interface
several times and select (program dry operation).
3 Press the ON/OFF button of the user interface. The operation
lamp lights up and the system starts operating.
4 Press the air flow direction adjust button (only for Double-flow,
Multi-flow, Corner, Ceiling-suspended and Wall-mounted). Refer
to "6.3. Adjusting the air flow direction" on page 54 for details.
Stopping the system
5 Press the ON/OFF button of the user interface once again. The
operation lamp goes out and the system stops operating.
6.3. Adjusting the air flow direction
Refer to the operation manual of the user interface.
6.3.1. Movement of the air flow flap
NOTICE
Do not turn off power immediately after the unit stops, but
wait for at least 5 minutes.
INFORMATION
 The heating capacity drops when the outside
temperature falls. If this happens, use another heating
device together with the unit. (When using together
with appliances that produce open fire, ventilate the
room constantly).
Do not place appliances that produce open fire in
places exposed to the air flow from the unit or under
the unit.
 It takes some time to heat up the room from the time
the unit is started since the unit uses a hot-air
circulating system to heat the entire room.
 If the hot air rises to the ceiling, leaving the area
above the floor cold, we recommend that you use the
circulator (the indoor fan for circulating air). Contact
your dealer for details.
NOTICE
Do not turn off power immediately after the unit stops, but
wait for at least 5 minutes.
NOTICE
Do not turn off power immediately after the unit stops, but
wait for at least 5 minutes.
Double flow+multi-flow units
Corner units
Ceiling suspended units
Wall-mounted units
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