omi CHW 09 Bedienungs- Und Wartungsanleitung Seite 31

710.1760.00.03-00
No. Device Alarm
status code
A07
Fan and
compres-
sor are not
2
working,
A09
pump is
working
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
HOW TO RESET AN ALARM EVENT (CONTROLLER TYPE "B")
Controller Type "B"
(CHW 29 to CHW 602;
CHO 29 to CHO 230;
CHG 24 to CHG 140)
1) Enter the function Menu by press
2) Use or
3) Push and release the
4) Upper display: rSt label if the alarm can be reset, NO label if it is not possible (cause of alarm is
still persisting). Use
5) Push key, when rSt is lighted, to reset the alarm, after a while it will move to the next alarm.
6) To exit the function menu push and release the
disappears.
Alarm de-
scription
Percentage of anti-
freeze too low
Set point is too low for
actual system
Antifreeze
alarm
Liquid flow too low
Dirty evaporator
Thermal protection of a
new unit are in OFF po-
Compressor sition
thermal
switche alarm Compressor is having
problem
High liquid
temperature
alarm in inlet Required cooling capac-
line (if P3 or ity is higher than nomi-
P4 high temp. nal
alarm is pre-
sent)
One of the
Probe can be defective
probe is de-
or not well connected
fective
Maintenance Service on unit is re-
circuit 1 only quired due to length of
on request work
Maintenance Service on unit is re-
circuit 1 only quired due to length of
on request work
the control unit, procedure as described below.
key .
keys to find the "ALrM" label.
key, the lower display shows the alarm code.
or keys to scroll the alarm list.
Possible cause Recommended remedy
Add antifreeze to the liq-
uid
If possible increase set
point, or check combina-
tion of flow, temperature
and antifreeze percentage
Check right rotation of
pump and possible ob-
struction on liquid circuit
Clean evaporator and in
case contact service
Switch MTC in ON
Reset thermal switch and
in case contact of a per-
sistent problem contact
service
Decrease the required
cooling capacity
Check connection and in
case change probe
Contact a refrigerant
technician
Contact a refrigerant
technician
key or wait the time-out. The "menu" icon
31
25/05/2010
Restore (*)
M
M after re-
set MTC
A
becomes
M after 3
events in 1
hour
A
M
M