Danfoss ERC 21 Series, User Manual, Page: 19 / 36

Code Parameter description Min. Max. Unit
r40 Reference displacement offset temperature
The thermostat setpoint and the alarm values get shifted by this value when the reference displacement is activated. Activa-
tion can take place via digital input.
-50.0 20.0 °C
r96 Pull-down duration
Maximum duration of the pull-down mode. When set as “0” Pull down mode disabled.
0 960 min
r97 Pull-down limit temperature
A safety feature; the lowest temperature allowed during pull-down.
-100.0 200.0 °C
Alarm settings
Table 9: Alarm settings
Code Parameter description Min. Max. Unit
A-- Alarm settings
A03 Delay for temperature alarm during normal conditions
High and low temperature alarm will be delayed by this value after crossing the set alarm limits. The alarm will not become
active until the set time delay has been passed.
0 240 min
A12 Delay for temperature alarm during pull-down/start-up/defrost
Controller uses this time delay to trigger low and high temperature alarms during start-up, defrost and pull-down modes
0 240 min
A13 High temperature alarm limit
If the cabinet temperature stays above this limit for the time mentioned by the alarm delay parameters, high temperature
alarm is raised.
-100.0 200.0 °C
A14 Low temperature alarm limit
If the cabinet temperature stays below this limit for the time mentioned by the alarm delay parameters, low temperature
alarm is raised.
-100.0 200.0 °C
A27 DI1 delay
If Di1 is configured as a door open alarm or as an external alarm, this delay is used to raise the respective alarm.
0 240 min
A28 DI2 delay
If Di2 is configured as a door open alarm or as an external alarm, this delay is used to raise the respective alarm.
0 240 min
A37 Condenser high alarm limit
If the condenser temperature reaches above this limit, condenser alarm is raised immediately and no action is taken. The
alarm is reset if temperature falls 5 K below the set temperature.
0 200 °C
A54 Condenser High block limit
If the condenser temperature continues to increase above the A37 limit and reaches this temperature limit, condenser block
alarm is raised and compressor is stopped. It is restricted to starting again until alarm is reset manually. Manual reset of con-
denser block alarm can be performed by power cycling the controller either by main switch button or input supply.
0 200 °C
A72 Voltage protection
This parameter is to enable and disable the voltage protection feature, which protects compressor from adverse line voltage
conditions.
no YES
A73 Minimum cut-in voltage
When the compressor is due to start, the voltage of the power supply will be checked and the compressor is allowed to start
if the supply voltage is greater than this value.
0 270 V
A74 Minimum cut-out voltage
When the compressor is running, it will be switched OFF if the supply voltage goes below this value.
0 270 V
A75 Maximum voltage
When the compressor is running, it will be switched OFF if the supply voltage exceeds this value.
0 270 V
Defrost
Table 10: Defrost
Code Parameter description Min. Max. Unit
d-- Defrost
d01 Defrost type
Selection of desired defrost type
no= No defrost (defrost function diabled)
nAt = Natural defrost (Off cycle defrost)
EL = Electrical defrost
gAS = Hot gas defrost
no gAS
d02 Defrost stop temperature
This parameter defines at what temperature the defrost cycle will stop. Defrost can be stoped based on either evaporator
sensor or by the cabinet temperature sensor as defined in menu code d10.
0.0 50.0 °C
d03 Defrost interval
Defines the maximum time period between the start of two defrost cycles. In case of power failure elapsed time is stored in
the memory and next defrost will happen considering the stored time interval.
0 240 hour
d04 Maximum defrost time
This parameter defines the maximum time defrost will be performed. In case of temperature based defrost this is treated as
safety time to stop the defrost if it is not terminated based on the temperature.
0 480 min
d05 Defrost delay at power up or DI signal
This parameter decides the time offset when the defrost is triggered by digital inputs or during power up. This function is
only relevant if you have several refrigeration appliances or groups where you want the defrost to be staggered in relation to
one another.
0 240 min
© Danfoss | Climate Solutions | 2023.01 BC194286421698en-000901 | 19
Electronic refrigeration control, type ERC 21X