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8
I. Overview
1. DVM system series
(3) Variable compressor
The world’s first PWM(Pulse Width Modulation) compressor controls the cooling & heating capacity
automatically, depending on the load.
1) Principle of the digital compressor
①
Composition
The solenoid valve is installed for the compressor´s loading / unloading between the upper part of the
fixed scroll and the suction pipe.
②
Mechanism
a. When the solenoid valve is turned off, the fixed scroll is closed to the orbiting scroll (Loading),
b. When the solenoid valve is turned on, the fixed scroll is separated from the orbiting scroll (Unloading),
c. This process controls the On / Off times of the valve and the rotating refrigerants in the circle,
thus adjusting the capacity.
d. The cooling capacity of the outdoor unit is controlled automatically,depending on the
number of operating indoor unit(s).
Total capacity of operating indoor unit(s)
(kcal/h)
100
90
80
70
60
50
40
30
20
10
0
3000 6000 9000 12000 15000 18000
Running ratio of compressor(%)
unloading
loading
< 1 Compressor >
Total capacity of operating indoor unit(s)
(kcal/h)
100
90
80
70
60
50
40
30
20
10
0
3000 6000 9000 12000 15000 18000
Running ratio of compressor(%)
Fixed compressor
operating
Digital operating
Digital only
operating
< 2 Compressor >
DVM E-D/B(chapter1)-E<03759 3/21/02 6:55 PM Page 8