SiE-05C Outline of Control
Functions PLUS Series 243
4.17 Backup Operation
If a STD outdoor unit is faulty, if you restart with the remote controller after it stops due to malfunction, the
system starts operating again without the faulty STD outdoor unit.
Backup operation can be used up to a total of 3 hours of indoor unit operation. When 3 hours elapses, if the
malfunction continues, the unit stops again due to malfunction. If it returns to normal, it can continue to
operate as is.
After the system stops due to malfunction to let you know the system is faulty, backup operation is started
by remote controller.
Three hours after starting backup operation for the reason given above, malfunction detection is once
again carried out, and the system stops due to malfunction if a malfunction still exists.
(All indoor units in the system stop.)
Operation of faulty STD outdoor unit
<In case of cooling only system>
Other outdoor units carry out normal operation.
(Control flow of backup operation)
Restart malfunction
Malfunction occurs
System malfunction stop
Remote controller reset
Backup operation start
Operation without faulty outdoor unit
3 hours elapse
< Malfunction detection >
No malfunction
Returns to normal operation
(VF122)
Compressor Outdoor unit fan Outdoor unit EEV Hot gas bypass
Faulty STD
outdoor unit
OFF H + ON 0 PLS ON
Compressor Outdoor unit fan Function unit’s solenoid valve Y5, Y6, Y7
Faulty STD
outdoor unit
OFF H + ON ON
SI-05C.BOOK Page 243 Monday, November 6, 2000 4:13 PM
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