6-27
6.5.5 Automatic Back up for supply / return air temperature sensors
When the unit is equipped with the data recorder sensors, the following emergency operations are
available.
When the DRS and DSS are used for the emergency operation, DATA RECORDER SENSOR ON/OFF
SETTING to be set OFF. (Refer to page 3-27, basic function setting mode.)
RS: Return air temperature sensor DRS: Data recorder return air temperature sensor
RRS: Recorder return air temperature sensor
SS: Supply air temperature sensor DSS: Data recorder supply air temperature sensor
RSS: Recorder supply air temperature sensor
Malfunction code
Abnormal point
Emergency operations
E401
SS
Supply air temperature
sensor (SS) for control
malfunction
Replace the SS and
DSS.
E402
DSS
Data recorder supply air
temperature sensor
(DSS) malfunction
───
E401
E402
Both SS and DSS
malfunction
───
E403
RS
Return air temperature
sensor (RS) for control
malfunction
Replace the RS and
DRS.
E404
DRS
Data recorder supply air
temperature sensor
(DRS) malfunction
───
E403
E404
Both RS and DRS
malfunction
───
H006
Chilled mode:
Temperature difference is
2 ˚C or more between SS
and DSS or more than
one hour.
Replace the SS and
DSS only when the
SS is faulty.
Frozen mode:
Temperature difference is
2 ˚C or more between RS
and DRS or more than
one hour.
Replace the RS and
DRS only when the
RS is faulty.
Unit back-up operation
Check method
Chilled mode:
Back-up operation
with DSS
Frozen mode:
only malfunction code
indication
Check for looseness
of the connector and
crimp terminal.
Only malfunction code
indication
Check for looseness
of the connector and
crimp terminal.
Chilled mode:
Back-up operation
with RS –2˚C.
Frozen mode:
only malfunction code
indication
Check for looseness
of the connector and
crimp terminal.
Chilled mode:
only malfunction code
indication
Frozen mode:
Back-up operation
with DRS
Check for looseness
of the connector and
crimp terminal.
Only malfunction code
indication
Check for looseness
of the connector and
crimp terminal.
Chilled mode:
only malfunction code
indication
Frozen mode:
Back-up operation
with SS +5˚C
Check for looseness
of the connector and
crimp terminal.
Only malfunction code
indication
Compare with records
by a recorder, and
decide which sensor
is faulty.
Only malfunction code
indication
Compare with records
by a recorder, and
decide which sensor
is faulty.
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