AERMEC micro chiller 2, Usage Manual, Page: 19 / 48

19
Alarms
Code Cause Description
HP1
High pressure Turn the compressor off immediately, alarm relays and display flashing come on. Fans are activated at maxi-
mum speed for 60 s, to contrast the alarm situation then they are turned off. Heat pumps can indicate inter-
vention of thermal compressor protection. Resetting is manual.
LP1
Low pressure The alarm turns the compressor off immediately or does not turn it on; alarm relays and display flashing
come on. Resetting is automatic.
TP
General thermal Alarm is heard independently of pump and compressor state. It turns compressors, pumps and fans off,
(without observing protection times) and does not permit start-up; alarm relay and display flashing come on
with relative message and LED. Resetting is both automatic or manual.
FL
Flow state Alarm turns pump, compressor and fans off, display starts flashing and alarm relay comes on . Resetting is
manual.
E1, E2, E3
Probe alarm A probe alarm deactivates compressor, fans and pump; alarm relay and flashing display come on. Resetting
is automatic.
E1: Water inlet probe
E2 : Water outlet probe
E3 : Battery probe
E4
Compensation probe alarm A probe alarm deactivates compressor, fans and pump; alarm relay and flashing display come on. Resetting
is automatic.
EPr
EEPROM error A problem with the machine’s non volatile memory (eeprom). If it is EPr, the unit carries on working till first
power stop. When power comes back, if the error is still there the display starts flashing the words EPb and
the unit does not start; resetting is automatic.
EPb
EEPROM error when starting up
dF1
Defrosting ends for maximum time limit If defrosting ends due to maximum time when the selected end was temperature threshold reached or
external contact, the machines displays the initials dF1. The message can be turned off through the alarm
cancellation procedure or by doing another correct defrosting cycle. Alarm relay does not come on.
d1
Defrosting in progress During defrosting, the machine displays alternately the message d1 and temperature
A1
Anti-frost alarm The alarm is through the evaporator water outlet probe evaporatore (SUW). The alarm turns compressor
and fans off immediately and alarm relay and flashing display come on. Resetting is manual.
ELS
Low feeding power If feeding power is too low or too high, the message ELS or EHS appears not guaranteeing correct EHS
functioning.
EHS
High unit feed tension
Signalling of specific unit operating condi-
tions or an alarm condition, are by the micro
chiller controller, through codified messa-
ges appearing on the display; to de-codify
those messages, use the table below. When
an alarm occurs, the following actions are
usually taken:
• Alarm relay comes on
• Temperature flashing on the display
• Display showing an alarm code alternated
with temperature
When the alarms stop through automatic resetting or by pressing and at the same time
for five seconds for manual resetting, the following take place:
• Alarm relay deactivates.
• Temperature stops flashing on the display.
• The alarm code is no longer shown on the display.
If the alarm continues, the alarm signalling procedure is repeated.
ALARM RESETTING