omi CHW Serie Manual De Uso Y Mantenimiento página 31

710.1760.00.01-03A
No. Device Alarm
status code
A01
A02
A05
Fan and
compressor
are not
2
working,
pump is
working
A07
A09
A16
P1 P2
P3 P4
A13
Unit is
3
working
A15
(*) A After fault rectification system is automatically restored to standard setting
M Alarm function restored by settings made on the control unit, procedure as described below.
Alarm descrip- Possible cause
tion
Fan is not working fine or
the sense of rotation is not
correct
Refrigerant high Required cooling capacity
pressure alarm is higher than nominal
Air filter dirty (only for
units with this kind of op-
tion)
Unit low on refrigerant
Liquid flow too low
Refrigerant low
Percentage of antifreeze
pressure alarm
too low or not present,
even for range of tempera-
ture higher than 5°C
Dirty evaporator
High liquid tem-
perature alarm (if
Required cooling capacity
P3 or P4 high
is higher than nominal
temp. alarm is
present)
Percentage of antifreeze
too low
Set point is too low for ac-
tual system
Antifreeze alarm
Liquid flow too low
Dirty evaporator
Thermal protection of a
new unit are in OFF posi-
Compressor
tion
thermal switch
alarm
Compressor is having
problem
High liquid tem-
perature alarm in
Required cooling capacity
inlet line (if P3 or
is higher than nominal
P4 high temp.
alarm is present)
One of the probe Probe can be defective or
is defective not well connected
Maintenance cir-
Service on unit is required
cuit 1 only on re-
due to length of work
quest
Maintenance cir-
Service on unit is required
cuit 1 only on re-
due to length of work
quest
Recommended remedy
Check fuse of the fan, and right
rotation
Decrease the required cooling
capacity
Dismount the filter from the unit
and clean it with air or with wa-
ter
Check liquid sight glass and in
case contact service
Check right rotation of pump and
possible obstruction on liquid cir-
cuit
Add antifreeze, or try to increase
temperature or flow of liquid the
combination of these three ele-
ment can cause ice problem
Clean evaporator and in case
contact service
Decrease the required cooling
capacity
Add antifreeze to the liquid
If possible increase set point, or
check combination of flow, tem-
perature and antifreeze percent-
age
Check right rotation of pump and
possible obstruction on liquid cir-
cuit
Clean evaporator and in case
contact service
Switch MTC in ON
Reset thermal switch and in case
contact of a persistent problem
contact service
Decrease the required cooling
capacity
Check connection and in case
change probe
Contact a refrigerant technician
Contact a refrigerant technician
31
14/11/2012
Restore (*)
A
becomes
M after 10
events in 1
hour
M
M
M after reset
MTC
A
becomes
M after 3
events in 1
hour
A
M
M