Installation and operation manual
48
10T8Y1B
VRV-W IV System Air Conditioner
4P399208-1 – 2015.01
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 BS
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
Automatic operation can only be selected on the heat recovery
system.
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"
.
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 of the user interface
several times and select the operation mode of your choice.
Cooling operation
Heating operation
Fan only operation
Automatic operation (heat recovery system)
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.
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.
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.
Ambient temperature around
the VRV IV water-cooled unit
0~40°C
(a)
(a) Heat release from the unit: 0.71 kW/10 Hp/hour
Indoor temperature
21~32°C DB
14~25°C WB
15~27°C DB
Indoor humidity
≤
80%
(b)
(b) 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.
Water temperature at the
water inlet of the VRV IV
water-cooled unit
10°C~45°C
(c)
(c) The lower limit is extendable till –10°C (heating operation mode) in case the brine
type setting is activated. (See
"Brine type setting" on page 36
)
Water flow rate
50~150 l/min
(d)
(d) Water flow rate is indicated for 1 outdoor unit (not several as in multi outdoor unit
combination)
INFORMATION
Automatic operation (heat recovery system ONLY). In this
operation mode, cool/heat changeover is automatically
performed.
NOTICE
Do not turn off power immediately after the unit stops, but
wait for at least 5 minutes.
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
