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2
2. Processes and functions
SM830035
Chart Explanations and notes
❑ This chart shows how the outdoor fan speed and the electronic refrigerant control valve
react to coil temperature to keep the indoor heat exchanger coil from overloading.
❑ When sensor E2 rises above 60°C the electronic refrigerant control valve opens at 50 steps/
30 seconds until E2 falls below 59°C.
❑ Sensor E2 is located in the middle of the indoor unit heat exchange unit.
❑ When sensor E2 rises above 62°C, the control circuit stops the outdoor fan motor till the
temp. drops to 55°C
❑ Fuzzy control controls the electronic refrigerant control valve.
Fig. 10
2-7 Overload Protection (Heating)
This function prevents the air conditioner from overloading.
(°C)
ELECTRONIC REF.
CONTROL VALVE
INDOOR UNIT COIL
TEMP. (E2)
64
62
60
59
55
53
OUTDOOR FM
START UP
COMPENSATION
OFF
OPEN
H OR M H OR MH M
0438_M_S
FUZZY CONTROLFUZZY CONTROL
OVERLOAD
PROTECTION OVERLOAD PROTECTION
OPEN
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