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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.
(The HEAT mode on the remote controller cannot be selected.)
Note 2:
If the unit failure has been caused by a fault 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, 2 and 3 of SW06 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 fault 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.
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
SW06
SW07
SW09
SW10
SW11
SW12
1
2
3
4
1
2
3
4
SW16
SW17
SW13
SW14
Turn on Bits 1, 2 and 3 of SW06.
