Display Example; Selection Of Outdoor Unit For Pressure Adjustment; Setup For Outdoor Unit For Adjustment Of Pressure; Setup For The Troubled Outdoor Unit - Toshiba Super MMU-AP0091H Service Manual

6. Close fully the service valve of the gas pipe of the troubled outdoor unit approx. 10 minutes after the system has
started.
7. Push the push SW04 of the troubled outdoor unit in order to display the pressure data (MPa).
(Every pushing SW04, the displayed data changes successively.)

Display Example

[Selection of outdoor unit for pressure adjustment]

8. For the outdoor units which are operating with pump-down mode, the outdoor unit having the least unit number is
selected as the outdoor unit for adjustment of pressure.
Unit No.
While SW01/02/03 are set to 1/1/1, the number displayed on 7-segment display indicates the unit No.
([U#] [– – –]: # indicates the unit No.)
[Selection for outdoor units other than unit for adjustment of pressure and troubled unit]
9. Keep only the service valve of balance pipe of the unit for pressure adjustment and the troubled unit fully opened, and
close fully the service valves of other outdoor unit balance pipes.

[Setup for outdoor unit for adjustment of pressure]

10. Set up the rotary SW01/02/03 to 1/2/2 on the interface P.C. board of the outdoor unit for adjustment of pressure.
11. As the low-pressure data is displayed on 7-segment display section, close the service valves of the gas pipe slowly
by confirming by confirming the pressure data, and then adjust so that the pressure becomes around 0.12MPa.
12. When the low-pressure of the troubled outdoor unit has become almost same as that of the unit for pressure adjust-
ment, close fully the service valve of the gas pipe of the unit for pressure adjustment after operation for a while.

[Setup for the troubled outdoor unit]

13. When the low-pressure of the troubled outdoor unit becomes below 0.10MPa, close fully service valve of the balance
pipe and then push SW05 on the interface P.C. board to finish the pump-down operation.
14. Turn off the power supplies of all the outdoor units, and use a refrigerant recovery device to recover the remaining
refrigerant in the outdoor unit which the pump-down operation has completed. Be sure to measure the recovered
refrigerant amount. (It is because addition of refrigerant corresponding to recovered amount is necessary after repair.)
Close fully balance pipes of
the outdoor units other than
unit for pressure adjustment
and unit with trouble.
When low pressure of the troubled outdoor unit become
below 0.10MPa, close fully service valve of the balance
pipe.
Turn off the power of all the outdoor units.
Using a recovery device, the remaining refrigerant in
the outdoor unit in which pump down operation has
finished and measure the amount.
All of the refrigerant recovery work has finished.
[rd] [ 11]
Initial display
9
Close fully service valve of the
gas pipe approx. 10 minutes
after the system has started.
Outdoor unit with trouble
The low pressure
is displayed by
pushing SW04.
[Ps] [###]
13
14
[Pd] [1.20]
High pressure
6
An outdoor unit
having the least unit
number is selected as
the outdoor unit for
7
pressure adjustment.
The low pressure is
displayed by setting
SW01/02/03 to 1/2/2.
Close service valve of the gas pipe
gradually with checking the low pressure,
and then adjust the pressure to 0.12MPa.
When low pressure of the troubled outdoor
unit and low pressure of the outdoor unit
for pressure adjustment become almost
same, close the service valve of gas pipe
fully.
235
[Ps] [1.20]
Low pressure
8
10
[Ps] [###]
11
12