2. Processes and functions
2-13 Electronic Refrigerant Control Valve
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❑This valve allows very precise and smooth control of the amount of refrigerant flow in the system. Since the valve is operated by a step motor, the control circuits can open or close it in very exact amounts, so the degree of heating or cooling can be changed by just a little, or changed very quickly or slowly.
(Completely close …… 0 step) (Full open................ 480 step)
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HEAT |
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24 type | 100 step |
| 100 step |
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36 type | 90 step |
| 90 step | 480 step |
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42 type | 100 step |
| 100 step |
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❑Fuzzy Control
Fuzzy Control is a controlling system to control electronic refrigerant control valve using fuzzy logic. It regulates the functions of heating and cooling, as well as some of the processes inside the unit, by taking account of many different conditions of temperature, fan speed, etc. These control circuits work automatically to send just the right amount of refrigerant through the Electronic Refrigerant Control Valve.
2-14 Compressor Discharge Gas Temperature
(A) Cooling
Indoor temp. (°F) |
| 68 – 77 | 79 – 82 | 84 | – 90 | |
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Outdoor temp. (°F) | 55 or below |
| 57 – 61 | 81 – 95 | 97 | – 109 |
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Compressor discharge | 104 – 176 |
| 104 – 194 | 140 – 212 | 158 – 221 | |
gas temp. (°F) |
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(B)Heating (Except During Defrosting)
Indoor temp. (°F) | 64 – 70 |
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| 72 | – 77 |
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| 79 | – 86 |
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Outdoor temp. (°F) | 32 or below | 34 | – 50 | 32 or below | 34 | – 50 | 52 | – 70 | 32 or below | 34 | – 50 | 52 | – 70 | |
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Compressor discharge | 104 – 176 | 122 | – 194 | 122 – 194 | 122 | – 212 | 140 | – 221 | 122 – 194 | 140 | – 212 | 158 | – 221 | |
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❑Operate the unit at least 30 minutes to stabilize the discharge temperature.
❑The above discharge temperature was measured with a 15m tubing length. The temperature may vary with tubing length.
SM830082
II - 16
