Electronic Refrigerant Control Valve; Compressor Discharge Gas Temperature; (A) Cooling; (B) Heating (Except During Defrosting) - Sanyo SPW-T253GH56 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)
Model
25 type
36 type
48 type
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. (˚C)
Outdoor temp. (°C)
Compressor discharge
gas temp. (°C)

(B) Heating (Except During Defrosting)

Indoor temp. (°C)
Outdoor temp. (°C)
Compressor discharge
gas temp. (°C)
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
100 step 120 step
90 step
100 step 110 step
20 – 25
13 or below 14 – 16
40 – 80 40 – 90
18 – 21
0 or below 1 – 10 0 or below
40 – 80 50 – 90 40 – 90
– 39 –
2. Processes and functions
Max. open
COOL
90 step 480 step
26 – 28
27 – 35
60 – 100
22 – 25
1 – 10 11 – 21 0 or below
50 – 100 60 – 105 50 – 90
2
29 – 32
36 – 43
70 – 105
26 – 30
1 – 10 11 – 21
60 – 100 70 – 105
SM830034