COMPACT AHU WITH HEAT RECOVERY EVO-T +
OPERATION AND MAINTENANCE MANUAL
102
Sensor inputs PT1000
A_Tsup Disappearing
Testing the correct operation of the intake temperature sensor:
Normal state – no alarm, sensor connected
Alarm state – alarm is present, sensor disconnected or defective
Response to the alarm condition: the temperature adjustment is stopped,
the fans operation is not stopped, check the sensor and its connection to the
controller, nd out problem source, once the problem is eliminated the system
resumes operation with the temperature adjustment.
Sensor input P1(B1)
A_Texh Disappearing
Testing the correct operation of the outlet temperature sensor:
Normal state – no alarm, sensor connected
Alarm state – alarm is present, sensor disconnected or defective
Response to the alarm condition: the temperature adjustment is stopped,
the fans operation is not stopped, check the sensor and its connection to the
controller, nd out problem source, once the problem is eliminated the system
resumes operation with the temperature adjustment.
Sensor input P2(B2)
A_Tout Disappearing
Testing the correct operation of the outdoor temperature sensor:
Normal state – no alarm, sensor connected
Alarm state – alarm is present, sensor disconnected or defective
Response to the alarm condition: the temperature adjustment is stopped,
the fans operation is not stopped, check the sensor and its connection to the
controller, nd out problem source, once the problem is eliminated the system
resumes operation with the temperature adjustment.
Sensor input P3(B3)
A_Trec Disappearing
Inspection of air exhaust temperature sensor operation downstream the heat
exchanger
Normal state – no alarm, sensor connected
Alarm state – alarm is present, sensor disconnected or defective
Response to the alarm condition: the temperature adjustment is stopped,
the fans operation is not stopped, check the sensor and its connection to the
controller, nd out problem source, once the problem is eliminated the system
resumes operation with the temperature adjustment.
Sensor input P4(B4)
A_Tmain Disappearing
Testing the correct operation of the lead temperature sensor:
Normal state – no alarm, sensor connected
Alarm state – alarm is present, sensor disconnected or defective
Response to the alarm condition: the temperature adjustment is stopped,
the fans operation is not stopped, check the sensor and its connection to the
controller, nd out problem source, once the problem is eliminated the system
resumes operation with the temperature adjustment.
Input dependent on lead sensor selection
Misc alarms
A_Filter Disappearing
Information function regarding necessary lter replacement:
Normal condition – allowable contamination
Alarm condition – not allowable contamination
Response to the alarm condition: the system operates, the contaminated lter
alarm is displayed, if such alarm occurs, install the new lter immediately, AHU
operation with contaminated lter can reduce the AHU eciency and can lead
to the lter damage which in turn can cause contamination and damage of heat/
cool exchangers (that would be a customer’s fault).
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