Operating Instructions and Installation
Samsung Electronics11-2
■ Pulse width operation
• 10% ~ 100% wide capacity control
• PWM operation of Loading Duty in accordance with capacity demanded
• Pressure / Autonomic dispersion control
Note : • The Digital Scroll operates in 2 states: loaded state and unloaded state. There is an external solenoid valve in the Digital
Scroll. When a 220V signal is given to the solenoid valve, the top scroll moves up by about 1 mm.
The movement of the top scroll creates a gap between the 2 scroll elements and there is no axial sealing between the
scrolls. As a result, even though the motor is running, the compressor is unable to compress any refrigerant.
The capacity in the loaded state is 100% and during the unloaded state is 0%. Capacity from the compressor is a time
average of the loaded state and the unloaded state. For example, in a cycle time of 20 seconds, if the scrolls are loaded
for 10 seconds and unloaded for 10 seconds, the time-averaged capacity is 50%.
■ The to control the cooling/heating system automatically
The PWM valve is designed specially as a solenoid valve to modulate the pressure forcing on the fixed scroll and finally working
on the compressor’s loading/unloading between the upper part of the fixed scroll and the suction pipe.
The PWM receives the On/Off signal and controls the loading/unloading status. When the PWM valve is turned off, the fixed scroll
is pushed down to the orbiting scroll (Loading). When the PWM valve is turned on, the fixed scroll is separated from the orbiting
scroll (Unloading). This process is repeatedly done to make the outdoor unit controlling automatically depending on the number of
operating indoor unit(s) and their weighting factors.
Orbiting Scroll
Orbiting Scroll
Controller Signal
Fixed Scroll
Floating Seal
Digital Scroll Compressor(5.0HP)
Unit : kcal/h
Running ratio of compressor(%)
100
90
80
70
60
50
40
30
20
10
0
0 2500 5000 7500 10000 12500
Total capacity of operating indoor unit(s)
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