2. Processes and functions
1
12
3
4
5
II - 10
SM830080
Chart Summary and Explanations
❑ Discharge temperature is sensed by TH8 (discharge gas sensor).
❑ When the temperature rises above 95°C the electronic refrigerant control valve opens at 50
steps/30 seconds until the temperature falls below 93°C.
❑ During HEATING operation, when the temperature rises above 105°C, the control circuit
stops the outdoor fan motor until the temperature falls below 90°C. Please note that this
control does not function during COOLING operation.
❑ For both COOLING and HEATING modes, if the temperature reaches 115°C (135°C for 48
type) the operation shuts down and alarm P3 appears on the remote controller.
❑ The outdoor fan speed is controlled on discharge temp. at heating mode.
Fig. 11
2-9 Auto. Mode for Automatic Heating/Cooling Switching
❑ When the AUTO mode is selected, the microprocessor calculates the difference
between the set temperature and the room temperature, and automatically
switches to the COOLING or HEATING mode to maintain the desired
temperature.
Room temp. ] Set temp. ➔ COOLING
Room temp. < Set temp. ➔ HEATING
This means that if the room temperature is higher or equal to the set
temperature, COOLING operation starts. If the room temperature is lower than
the set temperature, HEATING operation starts.
2-8 Discharge Temperature Control (Cooling and Heating)
This function prevents the compressor motor from burn out by overheating.
OUTDOOR
FAN SPEED
DISCHARGE GAS
TEMP. (°C)
115
105
95
93
90
85
COMPRESSOR
ELECTRONIC
EXPANSION VALVE
(DISCHARGE TEMP.)
TRIP IS OPERATED.
H or M
L
1566_M_S
OPENOPEN
H or M
ON
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