Airwell MQL 6 [20/40] Control system
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Airwell MQL 6 [20/40] Control system

Airwell MQH 15 [20/40] Control system
Page 19
English
Control System
6) In case of summer/winter switching through re-
mote contact, the unit will operate in cool-
ing mode when this contact is closed and
in heating mode when it is open.
If the unit is powered by 3-phase current, it
is essential that the compressor turns in the
correct direction. The direction of rotation
of scroll compressors is fixed. The direction
of rotation is wrong when, while the unit is
working, you can feel:
• an anomalous noise in the compressor
• the lack of the correct differential between dis-
charge pressure and suction pressure (i.e. if
the discharge pressure is just above the suc-
tion pressure).
If you exchange the connections of two out of
three phases, the compressor inverts the direc-
tion of rotation and these phenomena disappear
suddenly.
6.2 Failure Diagnostics
Alarms Table
Code
Meaning Possible cause Corrective action
E00
Remote On-Off Turning off of the remote On-Off
contact
Turn on the remote contact
E01
Excessive discharge pressure
(automatic energizing, just an in-
tervention in an hour)
1. The air circuit is clogged
2.
Altered calibration of the dis-
charge pressure contro
l
3. HP set point setting error
4.
Excessive refrigerant charge
5. Fan malfunctioning
6. Dirty refrigerant/air exchang-
er
7. Off-range operation
8. Low water flow rate (in heat-
ing mode)
9. Dirty water filter (in heating
mode)
1. Remove any obstacle
2. Set-up the regulator
3. Increase the set point
4. Check the charge
5. Check the functioning and connection
of the fan’s motor
6. Clean the exchanger
7. Ensure compliance with the working
range
8. Adjust the flow rate
9. Clean the air filter
E02
Insufficient discharge pressure
(automatic energizing until the
first two interventions in an hour)
1. Low water flow rate
2. Dirty refrigerant/air
exchanger
3. Clogged refrigerant filter
4. Low discharge pressure
5. Refrigerant leaks
1. Adjust the flow rate
2. Clean the exchanger
3. Replace the refrigerant filter
4. Check the set point of the discharge
pressure
5. Identify and remove any leaks
E05
Antifreezing protection
(automatic energizing until the
first two interventions in an hour)
1. Low water flow rate 1. Adjust the flow rate
E06
Failure of sensor ST2
(water outlet)
Occurs when ST2 is interrupted,
in short-circuit or off-range
Check ST2 and replace it if necessary
E07
Failure of sensor ST3
(refrigerant/water exchanger)
Occurs when ST3 is interrupted,
in short-circuit or off-range
Check ST3 and replace it if necessary
E41
Alarm is automatically resetted
up to first three events occurring
in one hour.
No water flow rate
Check the differential pressure switch, the
pump and the hydraulic system
Manuale MQL-MQH 10.6.2005 12:26 Pagina 19

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