(5) [rd] [… FF] will be displayed on the 7-segment display, and pump-down operation will start.
* To put the operation on hold midway, turn off the power supply to all the outdoor units, or press SW05 on the
interface P.C. board.
(6) Approx. 10 minutes after the system starts up, fully close the gas pipe service valve of the failed outdoor unit.
(7) Press SW04 o
f the failed outdoor unit to have pressure data (psi) displayed.
(The display switches each time SW04 is pressed.)
Display Example
[Selection of outdoor unit for pressure adjustment]
(8) Of all outdoor units operating in the pump-down mode, select the one with the lowest unit No. as an outdoor
unit for pressure adjustment.
Identifying Unit No.
The unit No. is the number displayed on the 7-segment display when SW01/02/03 are set to 1/1/1.
([U#] [– – –]: # represents the unit No.)
[Setup of outdoor unit for pressure adjustment]
(9) Set SW01/02/03 on the interface P.C. board of the outdoor unit for pressure adjustment to 1/2/2.
(10)As the low-pressure sensor output is displayed
on the 7-segment display, adjust the pressure to around 0.12
MPa by slowly closing the gas pipe service valve, with checking pressure data.
(11)Compare the low-pressure sensor outputs of the failed unit with that of the unit for pressure adjustment, and
wait until the two pressure readings become almost the same. After letting the system continue operating for
a while longer, fully close the gas pipe service valve of the unit for pressure adjustment.
Failed outdoor unitHeader unit
Interface P.C. board of failed outdoor unit
(3)
If oil has degraded due to
compressor fault, undo SV3A
valve connector.
(4) Set SW01/02/03 to 2/11/1.
[rd] [… … …] is displayed.
Press SW04 and hold for 5 seconds or more.
(5) [rd] [ FF] is displayed (pump-down operation starts).
Behavior during pump-down operation
Outdoor unit Behavior
Failed outdoor unit
Compressors: Turned off
Outdoor fan: On
PMV1 and PMV4: Open
SV2/3A/3B/3C/3D: On
SV41/42/52: On
Every other outdoor unit
Operates in test cooling
operation mode
[rd] […11]
Initial display
[Pd] [174]
High-pressure sensor output
[Ps] [174]
Low-pressure sensor output
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