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Ι
9
2) PWM (Pulse Width Modulation) valve
PWM valve is the valve to take away the fixed scroll by lifting up through the difference of pressure after the digital
scroll compress being connected to the outlet and inlet of suction. Therefore, the capacity of compressor is controlled
automatically according to the operation status such as loading when the valve is closed or unloading when the valve
is opened. PWM means the control of ON/OFF signal to the valve for loading/unloading.
(4) Refrigerant flow rates control
Refrigerant flow rates through the electronic expansion valve are controlled by the 2 factors, which are the
temperature difference between inlet and outlet of evaporator and the difference between room and set temperature.
a. An electronic expansion valve optimally distributes refrigerant flow rates to each room and the fuzzy logic enables
the unit to cool precisely; refer to the figure below.
b. The air conditioner senses the temperature difference between inlet and outlet of evaporator, plus the temperature
difference between room and set temperature. It calculates the superheat and the room temperature status, then
adjusts refrigerant flow rates by deciding the required steps for the valve to open.
①
Falling room temperature
②
Rising room temperature
③
Open electronic expansion valve
④
Close electronic expansion valve
1
0.5
0
-0.5
-1
①
②
③
④
Relationship between PWM valve and loading/unloading
PWM valve open
PWM valve close
Unloading
Period (Cycle Time, T)
Loading
compression
non-compression
(rotating in vain)
1.Overview_TM_E_06890 2/27/03 10:12 AM Page 9
Содержание Electronics DVM Series
Страница 3: ...1 Overview_TM_E_06890 2 27 03 10 11 AM Page 2 ...
Страница 4: ...SAMSUNG ELECTRONICS SAMSUNG DV MT M Air Conditioner 1 Overview_TM_E_06890 2 27 03 10 12 AM Page 3 ...
Страница 58: ...ΙΙ 33 8 Integrating power distribution system 2 Control system_TM_E_06890 2 27 03 10 13 AM Page 33 ...
Страница 59: ...ΙΙ Control System 9 Building management system ΙΙ 34 2 Control system_TM_E_06890 2 27 03 10 13 AM Page 34 ...
Страница 107: ...ΙΙΙ Indoor unit 7 Electric circuit diagram ΙΙΙ 48 2 Heat pump AVMKH 3 2 Indoor unit_TM_E_06890 2 27 03 10 14 AM Page 48 ...
Страница 108: ...ΙΙΙ 49 7 2 4 way cassette type 1 Cooling only AVMCC 3 2 Indoor unit_TM_E_06890 2 27 03 10 14 AM Page 49 ...
Страница 109: ...ΙΙΙ Indoor unit 7 Electric circuit diagram ΙΙΙ 50 2 Heat pump AVMCH 3 2 Indoor unit_TM_E_06890 2 27 03 10 14 AM Page 50 ...
Страница 110: ...ΙΙΙ 51 7 3 Duct type 1 Cooling only AVMDC AVMBC AVMHC 3 2 Indoor unit_TM_E_06890 2 27 03 10 14 AM Page 51 ...
Страница 112: ...ΙΙΙ 53 7 4 Wall mounted type 1 Cooling only AVMWC 3 2 Indoor unit_TM_E_06890 2 27 03 10 14 AM Page 53 ...
Страница 113: ...ΙΙΙ Indoor unit 7 Electric circuit diagram ΙΙΙ 54 2 Heat pump AVMWH 3 3 Indoor unit_TM_E_06890 2 27 03 10 14 AM Page 54 ...
Страница 164: ...7 Electric circuit diagram 26 Outdoor unit ΙΛ ΙΛ 2 070 4 2 Outdoor unit_TM_E_06890 2 27 03 10 15 AM Page 26 ...
Страница 165: ...27 ΙΛ 3 100 4 2 Outdoor unit_TM_E_06890 2 27 03 10 15 AM Page 27 ...
Страница 167: ...29 ΙΛ 2 100 4 2 Outdoor unit_TM_E_06890 2 27 03 10 15 AM Page 29 ...