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(9) Pump-down control
When SW7-1 is OFF, turning ON the pump-down switch SW1 for 2 seconds during the operation stop or anomalous stop
(excluding the thermostat OFF), the pump-down operation is performed. (This is invalid when the indoor unit is operating.
This is effective even when the indoor unit is stopped by the anomalous stop or the power source is turned OFF.)
(a) Control contents
1) Close the service valve at the liquid side. (It is left open at the gas side.)
2) Compressor is started with the target speed at 55 rps in the cooling mode.
3) Red and green lamps (LED) flash continuously on the outdoor unit control PCB.
4) Each of protection and error detection controls, excluding the low pressure control, anti-frost control and dewing
prevention control, is effective.
5) Outdoor fan is controlled as usual.
6) Electronic expansion valve is fully opened.
(b) Ending conditions
Stop control is initiated depending on any of the following conditions.
(i) Suction pipe temperature of -38.7°C or lower is detected for 5 seconds continuously.
a) Red LED: Light, Green LED: Flashing, Remote control: Displays stop.
b) It is possible to restart when the suction pipe temperature of -38.7°C or higher.
c) Electronic expansion valve (cooling/heating) is kept fully open.
(ii) Stop by the error detection control
a) Red LED: Flashing, Green LED: Flashing
b) Restart is prohibited. To return to normal operation, reset the power source.
c) Electronic expansion valve (cooling/heating) is kept fully open.
(iii) When the cumulative operation time of compressor under the pump-down control becomes 5 minutes
a) Red LED: OFF, Green LED: Flashing, Remote control: Stop
b) It is possible to pump-down again.
c) Electronic expansion valve (cooling/heating) is kept fully open.
Note
After the stop of compressor, close the service valve at the gas side.
Caution: Since pressing the pump-down switch cancels communications with the indoor unit, the indoor unit and
the remote control display "Transmission error – E5". This is normal.
(10) Base heater ON/OFF output control (Option)
(a) Base heater ON conditions
When all of following conditions are satisfied, the base heater is turned ON.
・ Outdoor air temperature (detected with Tho-A) is 1ºC or lower.
・ In the heating mode
・ When the compressor is turned ON
(b) Base heater OFF conditions
When either one of following conditions is satisfied, the base heater is turned OFF.
・ Outdoor air temperature (detected with Tho-A) is 3ºC or higher.
・ When the compressor stop has been detected for 30 minutes continuously
・ In the cooling or dehumidifying mode
Base heater ON
Base heater OFF
1
3
Outdoor air temperature (ºC) [Tho-A]
160
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'22 • PAC-SM-422
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