Specifications

RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
Installation and operation manual
53
2.2. System layout
Your VRV IV replacement heat pump series outdoor unit can be as
follows:
1 VRV IV replacement heat pump outdoor unit
2 Refrigerant piping
3 VRV direct expansion (DX) indoor unit
4 User interface (dedicated depending on indoor unit type)
5 Cool/Heat changeover remote control switch
3. Before operation
This operation manual is for the following systems with standard
control. Before initiating operation, contact your dealer for the
operation that corresponds to your system type and mark. If your
installation has a customized control system, ask your dealer for the
operation that corresponds to your system.
Operation modes (depending on indoor unit type):
 Heating and cooling (air to air).
 Fan only operation (air to air).
Dedicated functions exist depending on the type of indoor unit, refer
to dedicated installation/operation manual for more information.
4. User interface
This operation manual will give a non-exhaustive overview of the
main functions of the system.
Detailed information on required actions to achieve certain functions
can be found in the dedicated installation and operation manual of
the indoor unit.
Refer to the operation manual of the installed user interface.
5. Operation range
Use the system in the following temperature and humidity ranges for
safe and effective operation.
Above operation range is only valid in case direct expansion indoor
units are connected to the VRV IV system.
6. Operation procedure
 Operation procedure varies according to the combination of
outdoor unit and user interface.
 To protect the unit, turn on the main power switch 6 hours before
operation.
 If the main power supply is turned off during operation, operation
will restart automatically after the power turns back on again.
6.1. Cooling, heating, fan only, and automatic
operation
 Changeover cannot be made with a user interface whose
display shows "change-over under centralized control"
(refer to installation and operation manual of the user interface).
 When the display "change-over under centralized
control" flashes, refer to "6.4. Setting the master user interface"
on page 55.
 The fan may keep on running for about 1 minute after the
heating operation stops.
 The air flow rate may adjust itself depending on the room
temperature or the fan may stop immediately. This is not a
malfunction.
6.1.1. For systems without cool/heat changeover remote
control switch
1 Press the operation mode selector button on the user interface
several times and select the operation mode of your choice.
Cooling operation
Heating operation
Fan only operation
2 Press the ON/OFF button on the user interface.
The operation lamp lights up and the system starts operating.
6.1.2. For systems with cool/heat changeover remote control
switch
Overview of the changeover remote control switch
Operating the changeover remote control switch
1 Select operation mode with the cool/heat changeover switch as
follows:
Cooling operation Heating operation Fan only operation
2 Press the ON/OFF button on the user interface.
The operation lamp lights up and the system starts operating.
Outdoor temperature –5~43°C DB
–20~21°C DB
–20~15.5°C WB
Indoor temperature
21~32°C DB
14~25°C WB
15~27°C DB
Indoor humidity
≤80%
(a)
(a) To avoid condensation and water dripping out of the unit.
If the temperature or the humidity is beyond these conditions, safety devices may
be put in action and the air conditioner may not operate.
44
332
5
1
1
2
1 FAN ONLY/AIR CONDITIONING
SELECTOR SWITCH
Set the switch to
for fan only operation
or to
for heating or cooling operation.
2 COOL/HEAT CHANGEOVER SWITCH
Set the switch to for cooling or to
for heating.
1
1
1
1
1