Compressor Discharge Gas Temperature; Electronic Refrigerant Control Valve; (A)Cooling; (B)Heating (Except During Defrosting - Sanyo KH2442 / CH2442 Service Manual

2-13 Electronic Refrigerant Control 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)
Section
Fuzzy Control
Fuzzy Control is a controlling system to control electronic refrigerant control valve using
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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

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(A) Cooling
Indoor temp. (°F)
Outdoor temp. (°F)
Compressor discharge
3
gas temp. (°F)
(B) Heating (Except During Defrosting)
Indoor temp. (°F)
Outdoor temp. (°F)
4
Compressor discharge
gas temp. (°F)
5
Model
24 type
36 type
42 type
55 or below
104 – 176
64 – 70
32 or below 34 – 50 32 or below 34 – 50
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.
Min. open
HEAT COOL
100 step 100 step
90 step 90 step
100 step 100 step
68 – 77
57 – 61
104 – 194
72 – 77
II - 16
2. Processes and functions
Max. open
480 step
79 – 82 84 – 90
81 – 95 97 – 109
140 – 212 158 – 221
79 – 86
52 – 70 32 or below 34 – 50 52 – 70
SM830082