1
TD831077
I-5
Outline of W-ECO MULTI SYSTEM
2. Features of W-ECO MULTI SYSTEM
7 Capacity control
With a triple compressor organization (consisting of one PC compressor and two AC compressors), capacity control
can be implemented by adding an external save valve.
15
10
20
25
30
5
0
5
10
15 20 25 30
Required indoor capacity (H.P.)
Step control : Capacity control via compressors and
an external save valve.
Discharge Discharge
Accum.
Accum.
PC Unit (20 H.P.)
AD Unit (10 H.P.)
External save valve
Suction
Suction
Service Value
Wide tube
Balance tube
Narrow tube
To Indoor Unit
(H.P.)
PC
5ps
AC
5ps
SC
10ps
SC
10ps
: Refrigerant control via electric expansion valve
1753_M_I
¶ Complying EMC standard
Instead of an invertor, the W-ECO MULTI system uses a power control compressor and an external save valve to
control capacity. This results in reduced harmonic wave emissions.
¶ With the new power control compressor, now you can control output in 2.8 kW (1 HP) increments
without inverter technology.
1767_M_I
Shaft
Discharge port
Vane
Suction port
Suction port
Lower cylinder
Bypass
Power control
valve
• Three-compressor structure
features a power control
compressor (PC comp.) and
two standard constant speed
compressors. The combina-
tion of these compressors and
an external save valve makes
it possible to realize compres-
sor capacity control of 16
steps.
In addition, an electronic
expansion valve on the indoor
unit realizes even more
precise control of refrigerant
flow volume for better capacity
control in accordance with
load.
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