Operating manual
Document nr. : 022091
Version : V2.3
MC 785-SC
Client : General
Page : 21 of 32
5.
Alarms
The following alarm messages may appear in the SUCTION-display:
E1
= Pressure sensor suction defect.
Action: Everything off
E3
= Temperature sensor suction defect.
Action: None (no control function)
E10
= Low pressure alarm.
Action: None
E20
= Low pressure failure.
Action: Everything off
E30
= External low pressure failure.
Action: Everything off
E40
= Low temperature alarm
Action: None
E50
= Low temperature failure.
Action: Everything off
E60 = Oil pressure failure.
Action: Turn off compressor concerned
E70 = Fluid level warning.
Action: None
E80 = Maximum number of control steps has been exceeded.
Action: Regulate the pressure up to and including step 50.
T90
= Super heat warning
E90 = Super heat alarm
The following alarm messages may appear in the DISCHARGE-display:
E2
= Pressure sensor discharge defect.
Action: Everything off
E4
= Temperature sensor discharge defect.
Action: None (no control function)
E11
= High pressure alarm
Action: None
E21
= High pressure failure.
Action: Everything off
E31
= External high pressure failure.
Action: Everything off
E41
= High temperature alarm.
Action: None
E51
= High temperature failure.
Action: Everything off
When an alarm occurs the relevant alarm-code appears in the appropriate display and the LED
on
the appropriate side switches on. If an external alarm is registered, the appropriate fail LED will lit. By
means of the
MODE/SELECT
key it is possible to see which compressor and/or which condenser has
given the alarm. At the same time the LED above the
RESET/ALARM
key will flash as a reminder
that another alarm must be reset by pressing the
RESET/ALARM
key. If there are more than one
alarm then the first alarm to occur will be visible until it is reset, then the second alarm will be visible
until it is reset, and so on. If they have all been reset but not resolved then the alarm codes will flash
on the display and can be skimmed through with the
RESET/ALARM
key.
In addition it is possible to assign a relay as a general alarm relay; this is normally on and goes off in
case of alarm.
