2. Processes and functions
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II - 15
SM830080
2-13 Electronic Expansion Valve
❑ 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)
❑ 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 Expansion Valve.
2-14 Compressor Discharge Gas Temperature
Model
Min. open
Max. open Standard condition
HEAT COOL
25 type 100 step 120 step 100 – 200
36 type 85 step 85 step 480 step 100 – 200
48 type 85 step 85 step 100 – 200
(A) Cooling
Indoor temp. (˚C) 20 – 25 26 – 28 29 – 32
Outdoor temp. (°C) 13 or below 14 – 16 27 – 35 36 – 43
Compressor discharge
gas temp. (°C)
40 – 80 40 – 90 60 – 100 70 – 105
(B) Heating (Except During Defrosting)
Indoor temp. (°C) 18 – 21 22 – 25 26 – 30
Outdoor temp. (°C)
0 or below
1 – 10
0 or below
1 – 10 11 – 21
0 or below
1 – 10 11 – 21
Compressor discharge
gas temp. (°C)
40 – 80 50 – 90 40 – 90 50 – 100 60 – 105 50 – 90 60 – 100 70 – 105
❑ 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.
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