35
CONTROL SYSTEM
Locked loads
Compressor
Antifreeze heater
Integrative heaters
1
st
step
Pump
Integrative heaters
2
nd
step
Fans
CODE ALARM RESEt
(1)
INPUT DO2 DO4 DO5 AO3 AO1
Er05
Low pressure
Phase presence and sequence controller
Soft starter alarm
A / M ID2 X X
Er20
Differential pressure switch A / M ID3 X X X
(2)
X X
Er30
Antifreeze M AI2 X X
Er41
High pressure / Fan thermal protection A / M ID1 X X
Er45
Clock fault A -
Er46
Clock to be adjusted A -
Er47
Communication error with remote control A -
Er60
Water inlet probe fault A AI1 X X X X X
Er61
Water outlet probe fault A AI2 X X X X X
Er62
Liquid line probe fault A AI3
Er68
Outdoor air probe fault A AI4
Er75
Liquid pressure transducer fault A AI3
Er80
Configuration error A - X X X X X
Notes:
(1) A = automatic reset , M = manual reset
(2) Only when the alarm change to manual reset
Er05 Low pressure – Phase presence and sequence controller - Soft starter alarm
The alarm becomes manual reset when the number of operations per hour is higher than the set value of the parameter AL01.
The alarm is bypassed for the time equal to the value defined by parameter AL02 starting from the activation of the compressor or of
the reversing valve.
The alarm is disabled during defrost.
Er20 Differential pressure switch
The alarm is activated if the associated digital input remains activated for at least 2 seconds and automatically resets if the digital
input remains not activated for at least 2 seconds. The alarm change to manual reset if the digital input remains activated for more
than 10 seconds.
The start-up from stand-by mode of operation to cool or heat provides the by-pass of 'alarm for 30 seconds after the activation of the
pump with the compressor off.
Er30 Antifreeze
The alarm is bypassed for 3 minutes from switching on of the unit (in heating mode only).
Er41 High pressure / Fan thermal protection
The alarm change to manual reset when the number of events per hour is more than the value set in parameter AL03.
Er62 Liquid line probe fault
When the alarm is activated the fans work with on-off logic according to compressor request. The defrost cycle inlet and outlet are
managed according to the operating time of the compressor.
Er68 Outdoor air probe fault
When the alarm is activated, neither climate control nor dynamic defrost are available.
Er75 Liquid pressure transducer fault
When the alarm is activated the fans work with on-off logic according to compressor request. The defrost cycle inlet and outlet are
managed according to the operating time of the compressor.
Alarms table
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