1. Specifications
1
2
3
4
Section
– 33 – SM830076
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 STARTUP
COMPENSATION
OFF
OPEN
H OR M H OR MH M
1140_THS_I
FUZZY CONTROLFUZZY CONTROL
OVERLOAD
PROTECTION OVERLOAD PROTECTION
OPEN