Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 32

(7) Pump down control (Master unit/slave unit)
This control is for recovering refrigerrant to outdoor unit quickly in case of replacement or relocation of the outdoor unit.
(a) This control is performed from the master unit side. It cannot be controlled from the slave unit side. If this control is at-
tempted from the slave unit side, the following codes are displayed on the 7-segment LED of the slave unit.
Code display area
OPE
Note (1) The display returns to normal if the pump-down control switch is reset.
(b) Pump down operation can be performed with the operation of 3 dip switches SW5-1(Test run switch), SW5-2 (Test run
operation mode) and SW5-3 (Pump down switch)
(c) Pump down procedure
1) Shut the liquid side service valve on the outdoor units
2) Turn SW5-2 (test run operation mode) ON (cooling)
3) Turn SW5-3 (pump down switch) ON
4) Turn SW5-1 (test run switch) ON
(d) End condition
If any of the following conditions is satisfied, this control ends.
(i) If the low pressure (LP) ≤ 0.01MPa is detected for 5 seconds continuously, this control ends normally, and indicates
followings
① Red LED: Keeps lighting
② Green LED: Keeps flashing
③ 7-segment display: PdE
④ Remote controller: Stop
(ii) Anomalous all stop by the error detection control
(iii) If the cumulative compressor operation time under pump down control is 15minutes (End control because time is
up), this control ends and indicates followings
① Red LED: Stays OFF
② Green LED: Keeps flashing
③ 7-segment display: No display
④ Remote controller: Stop
(iv) When any of setting switch (SW5-1, SW5-2, SW5-3) is turned OFF during pump down control.
(Note) Even if only SW5-3 is turned OFF, it is not recognized as the cooling test run mode and it stops.
Data display area
10 Setting from the slave unit is invalid
30
- -
Contents of invalid operation