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B-3) For the outdoor unit selected as the master unit (Inverter unit in usual), execute the following operations.
1) Set the rotary switches on the interface P.C. board to the following numbers.
n SW03 [No.1]/SW02 [No.5]/Sw01 [No.2] (Trial cooling mode)
n 7 segment display : [C .][ ][ ][ ]
2) Keep pushing the push-switch SW04 on the interface P.C. board for 5 seconds or more.
The system starts the operation in trial cooling mode.
n 7 segment display : [C .][ ][– ][C]
When interrupting the work, turn off the power supply of all the outdoor units or push the push-switch
*
SW05 on the interface P.C. board.
3) Push the push-switch SW04 on the interface P.C. board to set the mode to Ps pressure data display
mode.
Every push of the push-switch SW04 for approx. 2 seconds, display content is exchanged.
*
<Initial display>
[r .][d ][1 ][1 ]
↑
B-4) 10 minutes after the system started the operation in trial cooling mode, close service valve of the gas pipe
of the failed outdoor unit fully.
B-5) Keeping the master outdoor unit and balancing pipe service valve of the failed outdoor unit opened fully,
close balancing pipe service valves of all the other outdoor units fully.
B-6) Select the master outdoor unit as the unit for pressure adjustment, and execute the operations in
Work procedure 2) to 5) of A-5) and A-6) and after.
3-10-2. How to Operate the System While the Failed Outdoor Unit is
Repaired
<Work procedure>
1) First, execute the operations in section 13.1 "Refrigerant recovery method in the failed outdoor unit".
2) Then, recover refrigerant in the system using a recovery device, etc.
Determine the refrigerant amount to be recovered according to capacity of the failed outdoor unit.
(See Table below.)
Capacity of failed outdoor unit
Refrigerant amount
to be recovered
*
NOTE : After repair, be sure to add the recovered amount of refrigerant.
3) Execute the operations in section 11.3 "Emergency operation when outdoor unit has failed".
Then, the work is finished.
<Pd pressure>: [Pd]
→
→
[H ][
.][
][
]
*
*
*
<TE temp.>: [tE]
←
[ ][
][
][
.]
*
*
*
Heat pump model
Cooling only model
3-138
<Ps pressure>: [Ps]
<TD1 temp.>: [td1]
→
[L ][
.][
][
]
*
*
*
<TS temp.>: [tS]
<TD2 temp.>: [td2]
←
[ ][
][
][
.]
*
*
*
6HP
8HP
5.0kg
7.0kg
4.5kg
5.5kg
[ ][
][
][
.]
—
*
*
*
←
[ ][
][
][
.]
*
*
*
10HP
9.0kg
7.0kg
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