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2. PROCESSES AND FUNCTIONS
2-7 Overload Protection (Heating)
This function prevents the air conditioner from overloading.
(°C)
64
62
60
INDOOR UNIT COIL
TEMP. (E2)
59
55
53
ELECTRONIC REF.
CONTROL VALVE
OUTDOOR FM
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.
OVERLOAD
PROTECTION
FUZZY CONTROL
OPEN
H OR M
Chart Explanations and notes
OVERLOAD PROTECTION
OPEN
START UP
COMPENSATION
OFF
37
–
–
FUZZY CONTROL
H
M
H OR M
0438_M_S
Fig. 10
2
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