Operating Instructions and Installation
11-13Samsung Electronics
3. Pulse Width Modulation(PWM)
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 to about 1mm. The movement of the top scroll cre-
ates 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%.
• 10%~100% wide capacity control
• PWM operation of Loading Duty in accordance with capacity
demanded
• Pressure/autonomic dispersion control
4. The to Control the Cooling System Automatically
The PWM valve is designed specially as a solenoid valve to modulate the pressure forcing on the fixed scroll and controlling the
compressor’s loading/unloading.
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 control automatically depending on the num-
ber of operating indoor unit(s) and their heating/ cooling demand.
Floating seal
Fixed scroll
Orbiting Scroll
Controller
Signal
Running ratio of compressor(%)
2-compressor system(10.0HP)
High capacity
Low capacity
Unit : kcal/h
100
90
80
70
60
50
40
30
20
10
0
0 5,000 10,000 15,000 20,000 25,000
Total capacity of operating indoor unit(s)
Digital Scroll
Digital Scroll
Fixed scroll
PWM valve Fixed scroll Operation
Off
Loading
Loading Compression
OnUnloading Unloading No Compression
To Next Page
Loading...
Need help?
General
