Compressor Backup Operation Setting - Toshiba MMY-MUP0721HT9P-UL Service Manual

9-2. Compressor Backup Operation Setting

<Outline>
If a failure occurs to one of the compressors installed in outdoor unit, follow the procedure described below to
back up the failured compressor by using the remaining, normal compressor.
Note: The backup operation of compressor cannot be done for
MMY-MUP0721*, MMY-MUP0961*, MMY-MUP1201*, MMY-MUP1441*, MMY-MUP168*
MMY-MUP072H1*, MMY-MUP096H1*, MMY-MUP120H1*
because only one compressor is installed in these models.
<Work Procedure>
(1) Turn off the power supply to all the outdoor units connected to the system.
(2) Set the DIP switches of SW103, provided on the interface P.C. board of the outdoor unit with the failure
compressor, as shown in the table below.
Factory default setting
When compressor No.1 (front left) is failured
When compressor No.2 (front right) is failured
(3) Turn on the power supply to all the units connected to the system.
This is the end of compressor backup operation setting.
SW101 SW102
ON
1 2 3 4
SW104 SW105
ON
1 2 3 4
SW103
Bit 1 Bit 2
OFF OFF
ON OFF
OFF ON
- 247 -
SW103
ON ON
1 2 3 4 1 2 3 4
SW106
ON ON
1 2 3 4 1 2
Bit 3 Bit 4
OFF OFF
OFF OFF
OFF OFF