22
Filter Reset
Procedure
Active
No code alarm is displayed when the filters are dirty but a caption appears on the first line,
“Filter cleaning”.
Filter relay (enabled/disabled):
This enables the activation of the alarm relay when the
controller reads one or multiple clogged air filters.
FILTER RESET
Using the
E
button on this screen, the user can activate the procedure which consists in:
-
Starting the unit in the exchange mode with a flow rate of -- m3/h;
-
Measuring and saving the speed of the fans that will be used as reference to
evaluate any future clogging of the air filters.
The procedure must be carried out after every cleaning or replacement of the air filters, or
when starting up the unit for the first time.
DIAGNOSTICS
The control panel displays the alarm and failure signals sent by the electronic card on the
unit. There are two types of messages and they are all coded with a multiple of 2:
-
Failure messages signaling a failing sensor;
-
Alarm messages signaling an anomalous operational condition.
Failure messages
Message
Meaning
Sens. Failure: 1
Delivery air temperature probe NTC1 disconnected or short-circuited
Sens. Failure: 2
Cooling evaporator temperature probe NTC2 disconnected or short-circuited
Sens. Failure: 4
Condenser B undercooling temperature probe NTC6 disconnected or short-
circuited
Sens. Failure: 8
Overheating temperature probe NTC4 disconnected or short-circuited
Sens. Failure: 16
Condenser A undercooling temperature probe NTC6 disconnected or short-
circuited
Sens. Failure: 32
Delivery water temperature probe NTC7 disconnected or short-circuited
Sens. Failure: 64
Compressor temperature probe NTC3 disconnected or short-circuited
Sens. Failure: 256
Cooling pressure transducer damaged
Sens. Failure: 512
Differential pressure sensor for exchange air
