TM_s-MEXT_ME28relC_00_12_19_EN
Technical manual
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
111
20.4.4
Backup activation events
The alarms that activate the emergency unit are shown in the table below.
Code
Display description
Details
Event
Time
Reset
Time
Position
Action
010
3
Flood Alarm: check
Water Connections
Engagement of the flooding sensor.
Visible only if the detecting input is present.
S/A
A/M
P
NO/U
101
Loss of Air Flow
Check Fan/Switch
Lack of air flow on the evaporator.
A
M
U
U
120
Room Temp.Sensor
Failed/Disconnected
Room air temperature sensor fault.
A
A
U
FN
FC
125
Room Humidity Sensor
Failed/Disconnected
Room humidity sensor fault.
Visible only when the T+H sensor is available.
A
A
U
FN
HU+DH
140
Delivery Air
Temperature Sensor
Failed/Disconnected
Delivery air temperature sensor faulty.
A
A
U
FN
Lim
144
Outdoor Temp.Sensor
Failed/Disconnected
External air temperature sensor faulty.
Only visible for Freecooling units
A
A
U
FN
FC
150
Heaters Overheating
or Heaters Contactor
Failed
Heater safety thermostat engagement.
Visible only if the unit is configured with heating elements.
Alarm managed both with ON/OFF heating elements and with
modulating heating element.
A
M
U
EH
319
Low Pressure
circuit 1 sensor
Failed/Disconnected
Circuit 1 low pressure transducer fault alarm.
Visible only if the transducer is present.
A
A
CI
FN
321
Low Pressure
circuit 2 sensor
Failed/Disconnected
Circuit 2 low pressure transducer fault alarm.
Visible only if the transducer is present.
A
A
CI
FN
510
4
Flood Alarm: check
Water Connections
Reports the engagement of the flooding sensor.
Visible only if the detecting input is present.
S
A/M
P
NO
531
Room Temperature
Above Max. Limit
Reports that the temperature is above the maximum set level.
S*
A
P
NO
601
EEPROM Error:
Replace Control Board
Reports a problem to the controller permanent memory.
S
A
U
NO
ATTENTION
The “High ambient temperature” event (S531) activates rotation only when the "LAN "Standby Limits" function is
not activated (the
function is described further on).
If one of the units in operation stops due to one of the alarms described above and causes activation of a back-up unit, calculation of the time for rotation is stopped until all
the units return to normal operation and are no longer in alarm mode.
Below is an example of calculation of the time for rotation.
Assuming there are 2 units where U1 is the Master and U2 is the Slave, counting of the time for rotation is as follows:
A.
STARTING SITUATION
•
U1: Stand-by
•
U2: ON
Counting of the time of unit 2 for rotation is in progress.
B.
EVENT 1
•
U1: ON
•
U2: OFF for alarm
Counting of the time for rotation is blocked at the last value reached.
C.
RETURN TO NORMAL CONDITIONS
•
U1: Stand-by
•
U2: ON
Counting of the time of unit 2 for rotation resumes at the last value reached before the alarm.
3
This event is displayed only if the P22.83 parameter is set as “Alarm
-
Automatic” or “Alarm
-
Manual”.
4
This event is displayed only if the P22.83 pa
rameter is set as “Automatic signal” or “Manual signal”.