C9" Ahu: Malfunction Of Thermistor (R1T) For Suction Air - Daikin ERQ Service Manual

ESIE09-05
C9
3.11 " " AHU: Malfunction of Thermistor (R1T) for Suction
Air
C9
Remote
Controller
Display
Applicable
AII AHU models
Models
Method of Malfunction detection is carried out by temperature detected by suction air temperature
Malfunction thermistor.
Detection
Malfunction
When the suction air temperature thermistor becomes disconnected or shorted while the unit is
Decision running.
Conditions
Supposed
Causes
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P232.
Troubleshooting
Defect of AHU thermistor (R1T) for air inlet
Defect of AHU PC board
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Caution
Connector
NO
is connected to
the AHU
PC board.
YES
Resistance
is normal when
measured after
NO
disconnecting the thermistor
from the AHU
PC board.
(7.2kΩ~
112kΩ )
YES
Troubleshooting by Indication on the Remote Controller
Connect the thermistor and turn
on again.
Replace the thermistor.
Replace the AHU PC board.
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