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9-4. Cooling-Season Outdoor Unit Backup Operation Setting
<Outline>
Limited to summer and other situations where there is no need for heating operation, this function makes it
possible to get backup operation up and running quickly without going through the normal setup procedure,
regardless of which type of outdoor unit has failed, the header unit or a follower unit.
In this backup operation, the system behaves in exactly the same way as described in the "Outdoor Unit
Backup
Operation Setting" section, except that it cannot perform heating operation.
Note 1: When the system is set up for this function, heating operation is not available.
("HEATING STANDBY" displayed on the remote controller.)
Note 2: If the unit failure has been caused by a failure in the interface P.C. board or electric circuit, this function
is not available. In that case, follow the procedure specified in the "Outdoor Unit Backup Operation
Setting" section.
<Work procedure>
(1) Turn off the power supply to all the units connected to the system.
[Setup of failed outdoor unit]
Regardless of whether the failed outdoor unit is the header unit or a follower unit, there is no difference in the
setup procedure.
(2) Turn on Bits 1 and 2 of SW103 provided on the interface P.C. board.
(3) If there is a leakage from an outdoor PMV (unable to close), fully close the liquid pipe service valve.
(4) Turn on the power supply to all the units connected to the system.
If the failure involves poor insulation of a compressor motor, remove the compressor leads before the power
is turned on.
This is the end of cooling-season outdoor unit backup operation setting.
Turn on Bits 1 and 2 of
SW101
SW102
SW103
ON
ON
ON
1 2 3 4
1 2 3 4
1 2 3 4
SW104
SW105
SW106
ON
ON
ON
1 2 3 4
1 2 3 4
1 2
- 293 -
SW103
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Troubleshooting
