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Section
– 40 –
SM830076
2. Processes and functions
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 Refrigerant Control Valve.
2-14 Compressor Discharge Gas Temperature
(A) Cooling
Indoor temp. (°F) 68 – 77 79 – 82 84 – 90
Outdoor temp. (°F) 55 or below 57 – 61 81 – 95 97 – 109
Compressor discharge
gas temp. (°F)
104 – 176 104 – 194 140 – 212 158 – 221
(B) Heating (Except During Defrosting)
Indoor temp. (°F) 64 – 70 72 – 77 79 – 86
Outdoor temp. (°F)
32 or below
34 – 50
32 or below
34 – 50 52 – 70
32 or below
34 – 50 52 – 70
Compressor discharge
gas temp. (°F)
104 – 176 122 – 194 122 – 194 122 – 212 140 – 221 122 – 194 140 – 212 158 – 221
❑ 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.
Model
Min. open
Max. open
Heating Cooling
24 type 100 step 120 step 480 step
36 type 90 step 90 step 480 step