Mitsubishi Electric Y Series Manual page 162

TECHNOLOGY INTRODUCTION
162
Inverter-driven compressor technology
Y-Series EP R2-Series
Y-Series P R2-Series
All CITY MULTI compressors are inverter-driven to precisely
match the cooling and heating demands of each building.
The compressor varies its speed to match the indoor cooling or heating demand
and therefore consumes only the energy that is required.
When an inverter-driven system operates at partial load, the energy efficiency of the
system is significantly higher than that of a standard fixed speed, non-inverter
system.
The fixed speed system can only operate at 100%, but partial load conditions
prevail for the majority of the time. Therefore, it cannot match the annual efficiency
of an inverter-driven system.
With its proven single inverter-driven compressor technology, the CITY MULTI
series is favored by the industry for its low starting currents (a mere 8 amps for a
20HP outdoor unit) and smooth transition across the range of compressor
frequencies.
• Stable and Smooth Operation
Capacity
100%
1-inverter compressor
15%
Intelligent Power Module (IPM) manufactured by
Mitsubishi Electric
*1
Y-Series EP R2-Series
*1
Y-Series P R2-Series
Power modules manufactured by Mitsubishi Electric are installed in
the compressor, which is the core component, as well as in the
inverter circuit board that drives the fan. SiC (silicon carbide) is used
in the power module that is equipped with a voltage-boosting circuit to
raise the output voltage of the inverter and expand the operating
range. This greatly reduces the power loss of the voltage boosting
circuit and helps improve the energy efficiency of the unit (EER and
SEER improvement).
* The 20 horsepower YNW is equipped with a voltage boosting circuit that uses SiC.
*1. IPM (compressor) is installed in the 14HP to 20HP (P350 to P500) single modules and the 26HP to 54HP (P650 to P1350) combination modules.
SiC elements are used in the 20HP (P500) single module IPM.
*2. IPM (compressor) is installed in the 14HP to 22HP (P350 to P550) single modules and the 26HP to 44HP (P650 to P1100) combination modules.
SiC elements are used in the 20HP and 22HP (P500 and P550) single module IPM.
*3. IPM (compressor) is installed in the 14HP to 36HP (P350 to P900) modules (excluding the 16HP to 20HP (P400 to P500) combination models).
EP WY-Series
P WR2-Series
Capacity
100%
2-inverter compressors
Inverter
7.5%
Load
*2 *3
EP WY-Series
*2 *3
P WR2-Series
Capacity
100%
No.2
No.1
No.1 5%
Load
Compressor
• Heating/Cooling Capacity
100%
Linear Capacity
Control
15%
Compressor Frequency
Low
*Values vary depending on actual
conditions, such as ambient temperature.
3-inverter compressors
No.3
No.2
No.2
No.1 No.1
No.1
High
* Image
Load