PWM control
Flat-tube heat exchanger
R2-Series
EP
R2-Series
P
WY-Series
WR2-Series
Y-Series
EP
Y-Series
P
R2-Series
EP
Y-Series
EP
• Round-tube heat exchanger
• Flat-tube heat exchanger
(Illustration)
Air
Air
Air
Air
Air
Air
Air
Air
Air
Air
Air
Air
Air
Air
Round-tube shape
Flat-tube shape
Control HIC*
To achieve the target output current, the intervals
at which the “pulse” signal is turned on are
controlled to adjust the output current.
At low load time, the pulse-on width is minimized
to save energy.
PWM control is used to control the number of motor revolutions
according to operational load. It varies the inverter pulse width
(electric signal wave occurring over a short period) to control the
output.
Optimal control of electrical current is required according to
operation.
0 A
0 V
AC
Pulse-on width increases
Does not require a high target output current.
Pulse width is adjusted
Target output current
Output voltage
Output
current
0 A
0 V
AC
Time
Time
The increased pulse-on width increases both the
duration that the voltage is applied and the amount
of electrical current compared to the low load time,
and accelerates the rotation speed of the
compressor from 60 rps to 140 rps.*
*The number of compressor rotations differs depending on the usage
condition.
Output current
is increased
• For low loads
Requires a high output current.
• For high loads
The ability to adjust the pulse range and output
current to suit a given load increases the
operating range of the unit.
The flat-tube heat exchanger delivers high heat exchange efficiency. The use of flat tubes increases the number of piping
stages while maintaining the same size of heat exchanger. The inside of the tube is divided into thin compartments to
increase the area of contact between the refrigerant and air, and thereby increase heat exchange effectiveness and
significantly improve energy-saving performance. The flat-tube heat exchanger improves heat exchange effectiveness by
approximately 30% compared to round-tube heat exchangers.
Approximately 30% increase
in heat-exchange efficiency
(compared to the round-tube)
220% increase in surface
area
(compared to the round-tube)
*Hybrid Integrated Circuit
VRF
Y-Series
VRF
Lineup
VRF
R2-Series
VRF
Zubadan
VRF
WY-Series
VRF
WR2-Series
VRF
S-Series
VRF
Indoor Units
Ventilation
Systems
Technologies and Functions
Remote Controller
Hot Water Solution
VRF
BC Controllers
VRF
S-Series
163
TECHNOLOGY INTRODUCTION
Summary of Contents for City Multi R2 Series
Page 1: ...CM20AN E NZ VRF City Multi Product Catalogue ...
Page 101: ...BC Controllers 101 ...
Page 112: ...Indoor Units VRF 112 ...
Page 114: ...Ceiling Cassette Type 4 Way Airflow Type 114 ...
Page 122: ...Ceiling Cassette Type 2 Way Airflow Type 122 ...
Page 128: ...Ceiling Concealed Type 128 ...
Page 150: ...Wall Mounted Type 150 ...
Page 154: ...Floor Standing Type 154 ...
Page 181: ...Ventilation Systems 181 ...
Page 190: ...Remote Controllers 190 ...