Possible Alarm Signals And Their Rectification; Controller Type "A" (Chw 11 To Chw 36; Chg 08) - omi CHW 09 Manual De Uso Y Mantenimiento

710.1760.00.01-00
You will find further information on safety precautions in the general warnings at the start of these in-
structions. Please note the following warnings in particular:
Do not remove (even only partially) the protective panels of the chiller unless it is necessary!
If the protective panels still have to be removed, disconnect the chiller from its energy sources (electrici-
ty and water), and affix a sign stating "Maintenance work on chiller in progress" on the operating panel.
Replace the protective panels afterwards as quickly as possible.
Wait at least 15 minutes before removing the protective panels so that the chiller can cool
down. Certain internal components have a very high and dangerous operating temperature!
Never open the sealed cooling assembly (compressor, evaporator and condenser) if there may
be any refrigerant or lubricating oil present!
Never carry out any welding or soldering on the cooling system when it contains refrigerant in order to
avoid the risk of generating toxic substances.
9.1

POSSIBLE ALARM SIGNALS AND THEIR RECTIFICATION

CONTROLLER TYPE "A" (CHW 11 TO CHW 36; CHG 08)

No. Device Alarm
status code
/
Pump is
working,
OFF
fan and
1
compressor
are not
OFF
working
LA2
P1
HA
Pump is not
working,
2 fan and
compressor
are working
Pump, fan
and com-
3 LA2
pressor are
not working
Alarm de- Possible cause
scription
Ambient temperature too
high
Dirty condenser
Refrigerant
high pressure Fan is not working fine or
alarm the sense of rotation is not
correct
Required cooling capacity is
higher than nominal
Air filter dirty (only for units
with this kind of option)
Remote ON/OFF contact is
Unit is in Off by
open or internal bridge re-
remote ON/OFF
moved
The unit is energized but not
Unit in stand by
switched on
Set point is too low for actu-
al system
Antifreeze
alarm
Liquid flow too low
Dirty evaporator
Sensor SL de- Probe can be defective or
fective not well connected
High liquid
Compressor switched off by
temperature
internal protection
alarm
The gear of the pump is
blocked by dusty or corro-
sion
Pump is
blocked
The motor of the pump is
internally protected
Antifreeze
Liquid flow too low
alarm
Recommended remedy
Decrease ambient tempera-
ture, increasing ventilation of
the room, removing heat
sources or repairing the unit
from the direct rays of sun
Clean the condenser as de-
scribed in maintenance
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 water
Check bridge ROO and close
the contact
Follow procedure to start up
the unit using button on con-
toller
If possible increase set point,
or check combination of flow,
temperature and antifreeze
percentage
Check right rotation of pump
and possible obstruction on
liquid circuit
Clean evaporator and in case
contact service
Check connection and in case
change probe
Contact a technician
Try to move the axe of the
pump and after that switch on
again
Switch off the unit for one hour
and try again after check the
axe is not blocked and there
are no liquid obstruction
Check no. 2 for pump problem
28
22/07/2009
Fault recti-
fication (*)
M after reset
high pressure
switch using
button on it if
present
A
A
A