• VRVII & VRV-WII features
1
•
Systems • VRVII & VRV-WII features
4
1
Creating maximum comfort
1-2
Smart control brings comfort - VRVII & VRV-WII
An electronic expansion valve, using PID control, continuously adjusts the refrigerant volume in respond to load variations of the indoor units. The VRV
system thus maintains comfortable room temperatures at a virtually constant level, without the temperature variations typical of conventional ON/OFF
control systems.
The thermostat can control stable room temperature at
±
0.5
°
C from set point.
1-3
Less frequent start/stop cycle - VRVII & VRV-WII
•
The technique adopted by Daikin, of regulating the capacity using multiple compressors clearly results in minimum switching losses and power surges
because of the overlap in capacity and frequency
•
Since Daikin utilises small 5HP inverter compressors, the influence of harmonics is less than that generated by a single large compressor
•
The use of multiple compressors by Daikin also ensures a 50 % standby facility
•
Smaller compressors are cheaper and faster to replace
Cooling
NOTE
1
the graph shows the data, measured in a test room assuming actual heating load.
Repeats hot and cold cycles
Start-up time reduced by
about 1/3
Large temperature
difference
Inverter AC
Non inverter AC
Set point
Slow start-up
Keeps temperature stable
Smaller
temperature
difference
VRV series (Daikin PID controls)
On/off controlled air conditioner (2.5HP)
Time
Suction air temp.
Frequency
30
116 30+on 116+on
Capacity
50%
60%
55%
65%
