(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℃
(9) Pump-down operation by external input
If an error stop is raised by an external input by refrigerant leaking alarm unit, the pump-down operation is performed at the
outdoor unit side in order to prevent the refrigerant from leaking.
They are local arrangements.
①
Refrigerant leaking alarm unit
②
Valve to shut liquid pipe
③
Valve to shut gas pipe
④
Equipment to shut down the liquid service valve at emergency call
Valves of
②and③should be selected what the pressure loss of refrigerant piping doesnʼt increase.
(a) Status 1: Pump-down operation
(i) Starting condition
①
When the external input function is assigned to “0: External operation input” and the external input terminal is
open (by refrigerant leaking alarm unit).
②
If the pump-down control is valid when the error stop is raised by the setting on 7-segment. ([P75] = “1”)
(ii) Contents of control
①
The pump-down operation for replacement is performed.
(iii) Ending condition
①
When starting conditions are lost.
②
When the pump-down operation has ended.
(b) Status 2: Emergency stop operation
(i) Starting condition
①
When the pump-down operation has ended in the status 1.
(ii) Contents of control
①
ON is output to CnZ1, and the gas service valve is shut down if it is connected on CnZ1.
②
Operation stops with the error full stop. ([E63] is displayed.)
(iii) Ending condition
①
When starting conditions for the status 1 are lost.
②
State of error continues for 3 minutes after the error full stop. It cannot be reset in this condition from the remote
control. If the starting conditions for status 1 are not yet established later, this can be reset by the remote control
inspection reset.
(iii) If the cumulative compressor operation time under the pump down control totals 15 minutes (ending by time count
up), it stops and initiates the following.
①
Red LED: stays OFF
②
③
7-segment display: No display
④
Remote control: Stop
(iv) When any of setting switches (SW5-1, SW5-2 and SW5-3) has been turned OFF during pump down.
(Note) Even if only the pump down switch SW5-3 is turned OFF, it does not recognized as the cooling test run mode , but stops.
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