(8) Pump down operation control at removal of unit
When an outdoor unit is discarded or removed, the pump down control is performed at the outdoor unit side in order to
recoverthe refrigerant quickly to the outdoor unit.
(a) Starting conditions
This is implemented with the liquid service valve closed.
(i) Outdoor unit operation mode – Stop
(ii) Turn ON the test run cooling switch SW5-2 (cooling).
(iii) Turn ON the pump down switch SW5-3 (pump down).
(iv) T
Note (1) Input before the power ON is invalid.
(b) Control contents
(i) Compressor starts under compressor start protection control and runs at target speed of pump down operation.
However, when the operation starting conditions have been established during the 3-minute delay control of
compressor, the compressor starts after completing the 3-minute delay control.
Item
Model
Target compressor speed at pump down operation
Number of compressors
Compressor speed
FDC121KXZEN/S1-W
1
37rps
FDC140KXZEN/S1-W
45rps
FDC155KXZEN/S1-W
(ii) As the startin
7-segment display shows “PdS” (Channel 0) at the code display area.
(iii) During the pump down operation control, the protective controls (excluing low pressure protective control,
anomalous low pressure control and pressure ratio protection control) and the error detection control are effective.
(iv) The sub-cooling coil expansion valve (EEVSC) closes fully during the pump down control.
(c) Ending conditions
If any of the following conditi
(i) If a low pressure (LP) ≤ 0.01MPa is detected for 5 seconds continuously, it ends normally and initiates the
followings.
①
Red LED: keeps lighting
②
③
7-segment display: PdE
④
Remote control: Stop
(ii) Anomalous all stop by the error detection control
(b) If any operation mode other than the forcible mode is commanded from indoor unit,
the following operations are performed depending on the 7-segment [P38].
(7) Emergency stop control
When one of indoor units receives the emergency stop signal from option device like as refrigerant leakage detector and the
information is transmitted to the outdoor unit, the outdoor unit stops operation and an emergency stop error is transmitted
to all indoor units running.
Make the emergency stop effective by remote control indoor function setting.
(a) When it receives the “Emergency stop” command from the indoor unit, it makes all stop by error.
(b) It shows the Error display “E63” and transmits the “Emergency stop” command to all indoor units.
(c) If the “Emergency stop reset” command is received from the indoor unit, the “Emergency stop reset”
command is transmitted to all indoor units.
[P38]=0 The mode unmatch message is displayed on the remote control or others and operation enters int the FAN
operation mode.
[P38]=1 Operate in the forcible mode.
Set temperature during cooling: 28℃
Set temperature during heating: 20℃
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