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SM830082
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Section
5
2. Processes and functions
Fig. 10
2-7 Overload Protection (Heating)
This function prevents the air conditioner from overloading.
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 140°F the electronic refrigerant control valve opens at 50
steps/30 seconds until E2 falls below 138°F.
❑ Sensor E2 is located in the middle of the indoor unit heat exchange unit.
❑ When sensor E2 rises above 144°F, the control circuit stops the outdoor fan motor till the
temp. drops to 131°F
❑ Fuzzy control controls the electronic refrigerant control valve.
(°F)
ELECTRONIC REF.
CONTROL VALVE
INDOOR UNIT COIL
TEMP. (E2)
147
144
140
138
131
127
OUTDOOR FM
START UP
COMPENSATION
OFF
OPEN
H OR M H OR MH L
1927_THS_I
FUZZY CONTROLFUZZY CONTROL
OVERLOAD
PROTECTION OVERLOAD PROTECTION
OPEN