Danfoss ERC 21 Series User manual

User Guide
Electronic refrigeration control
Type ERC 21X series
Smart multipurpose refrigeration controller

Contents
Introduction 5
Application 5
General description 5
ERC 21X series 5
ERC 211 5
ERC 213 6
ERC 214 6
Functions 8
Voltage protection 8
Compressor protection 8
Compressor protection against high condensing temperature 8
Reference displacement 9
Night mode 9
Fan cycling during compressor OFF cycle 10
Defrost on Demand 10
Applications 11
Pre-dened applications 11
ERC 211 controller 11
ERC 213 controller 11
ERC 214 controller 12
Electrical connection diagram 12
Electric noise 13
Conguration 14
Menu navigation and overview 14
Quick conguration at power up 14
Quick conguration via cFg menu 15
Parameters 18
Menu functions 18
Conguration 18
Thermostat 18
Alarm settings 19
Defrost 19
Fan 20
Electronic refrigeration control, type ERC 21X
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Compressor 20
Miscellaneous 21
Service 22
Parameters: ERC 211 22
Conguration 22
Reference 23
Alarm 23
Defrost 23
Compressor 24
Others 24
Polarity 24
Parameters: ERC 213 24
Conguration 24
Reference 25
Alarm 25
Defrost 25
Fan control 26
Compressor 26
Others 26
Polarity 27
Parameters: ERC 214 27
Conguration 27
Reference 27
Alarm 28
Defrost 28
Fan control 28
Compressor 29
Others 29
Polarity 29
Alarm code 30
Product specication 31
Technical specication 31
Mounting 31
Installation steps 32
Dimensions 32
Troubleshooting 33
Electronic refrigeration control, type ERC 21X
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Ordering 34
Sensors 34
Certicates, declarations, and approvals 35
Certicates, declarations, and approvals 35
Online support 36
Electronic refrigeration control, type ERC 21X
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Introduction
Application
ERC 21X is a smart multipurpose refrigeration controller designed to fulll today’s requirement of commercial
refrigeration applications. This controller is suitable for high, medium and low temperature applications with
natural, electrical and hot gas defrost compatibilities.
Typical applications include Glass door merchandisers, commercial fridges and freezers, cold rooms and various
other commercial refrigeration applications.
General description
ERC 21X controller comes with four push buttons, a big display, easy and intuitive menu structure and pre-dened
applications ensure ease of use. Controller is loaded with energy eciency features like smart evaporator fan
management, night mode and defrosts on demand features.
High capacity 16 A relay enable direct connection of heavy loads without use of intermediate relay: up to 2 hp
compressors depending on its power factor and motor eciency (power factor greater than 0.65 for 230 V and
greater than 0.85 for 115 V).
Safe operation of the unit is ensured through voltage protection, zero cross switching and high condenser
temperature protection features.
ERC 21X series
Three version of ERC 21X is available in both 230 V AC, 50/60HZ and 115 V AC, 60Hz.
• ERC 211: single relay output for refrigeration and heating applications.
• ERC 213: three relays outputs for ventilated refrigeration and heating applications.
• ERC 214: four relays outputs for ventilated refrigeration and heating applications.
ERC 211
ERC 211 has one relay output and two inputs (1 analogue, 1 analogue/digital). This controller can be used for either
cooling or heating applications.
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Electronic refrigeration control, type ERC 21X

Figure 1: ERC 211
Sair
Sc
DO1
Danfoss 80G8377
DI1
Outputs:
• Relay 1: compressor/solenoid valve control or simple heater in case of heating application.
Inputs:
• Input 1: control sensor (Sair).
• Input 2: condenser sensor or digital inputs that can be congured for various functions as mentioned under menu
code o02.
ERC 213
ERC 213 has three relays outputs and four inputs (2 analogues, 1 analogue/digital, 1 digital) for cooling and heating
applications.
Figure 2: ERC 213
Sair
Sc
DI1
DI2
DO2
DO3
DO1
S5
Danfoss 80G8378
Outputs:
• Relay 1: compressor/solenoid valve control or heater in case of heating applications
• Relay 2: can be congured defrost control or external alarm or cabinet light
• Relay 3: fan control
Inputs:
• Input 1: control sensor (Sair)
• Input 2: defrost sensor (S5)
• Input 3: condenser sensor (Sc) or digital input that can be congured for various functions as mentioned under
menu code o02
• Input 4: digital input that can be congured for various functions as mentioned under menu code o37
ERC 214
ERC 214 has four relays outputs and four inputs (2 analogue, 1 analogue/digital, 1 digital) for cooling applications.
Electronic refrigeration control, type ERC 21X
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Figure 3: ERC 214
Sair
Sc
DI1
DI2
DO4
DO2
DO3
DO1
S5
Danfoss 80G8379
Outputs:
• Relay 1: compressor/solenoid valve control
• Relay 2: defrost control, external alarm or cabinet light
• Relay 3: fan control
• Relay 4: this can be congured for either cabinet light or external alarm
Inputs:
• Input 1: control sensor (Sair)
• Input 2: defrost sensor (S5)
• Input 3: condenser sensor (Sc) or digital input that can be congured for various functions as metioned under
menu code o02
• Input4: digital input that can be congured for various functions as mentioned under menu code o37
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Electronic refrigeration control, type ERC 21X

Functions
Voltage protection
The voltage protection ensures that the compressor motor is operating within safe voltage ranges. If the power
supply voltage gets outside the specied high/low voltage cut-out ranges, the compressor is cut-out or restricted
from starting. Normal compressor operation is resumed when the power supply voltage is back in the area between
the high voltage cut-out limit and the low voltage cut-in limit.
Figure 4: Voltage protection
High voltage limit
Low voltage cut-in
limit (compressor start)
Low voltage cut-out
limit (alarm and
compressor stop)
Danfoss 80G8366
Compressor protection
Compressor protection feature protects compressor from short ON and OFF cycles by securing minimum run and
stop time. This would allow the refrigeration system to stabilize before starting the compressor again and also avoid
the chances of too many compressor cycles.
Figure 5: Compressor protection
Power to compressor
min run time
ON
OFF
CUT-IN
CUT-OFF
min stop time
time
time
Temperature
Danfoss 80G8375
Compressor protection against high condensing temperature
If the condenser is blocking up with dirt and thereby reaches a too high condensing temperature, the controller will
give the user early warning through condenser alarm and if temperature rises further, it will switch the compressor
OFF. If the temperature measured by the condenser sensor (Sc) is reaching the set “pre-alarm limit” an alarm is
raised, but no further action is taken. This is used to indicate to the user that something is wrong with the
condenser. Often the reason is that that the air ow to the condenser is restricted (dirt) or because the condenser
fan is broken.
The alarm will reset if the condenser temperature drops back by 5 °C. If the measured condenser temperature
continues to increase and reaches the set “Block limit” the compressor is stopped, and it is restricted from starting
again until the alarm is reset manually. The alarm can be reset manually by setting the parameter r12 Main switch to
OFF position and back to ON position or by powering the controller down.
Electronic refrigeration control, type ERC 21X
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Figure 6: Compressor protection against high condensing
temperature
Sc temperature °C
Sc temperature °C
Manual reset
Block limit
Pre alarm limit
Pre alarm OK
Compressor
Pre alarm
Block alarm
T1 T2 T3 T4
Danfoss 80G8376
Reference displacement
This feature enable user to toggle between two dierent set-points quickly by activating a switch on digital input.
This provides facility to switch between two storage temperatures without getting in to the menu. For example
meat requires dierent set points than vegetables. The reference displacement signal changes the normal
thermostat set-point and the alarm limits by a predened oset value.
Figure 7: Reference displacement
Danfoss 80G8474
Cabinet temp.
Thermostat ref. disp.
Thermostat ref. disp.
Time
Ref. displacement deactivated Ref. displacement deactivated
Low temp. alarm limit
Cut out
Differential
High alarm limit
High temp. alarm limit due to thermostat ref. replacement
Alarm limit also changes
(similar to high alarm limit)
Ref. displacement activated
Night mode
Night mode helps to reduce cooling load and thereby power consumption during non-business hours i.e., Night
time. The thermostat set point will be oset by a xed value during night mode keeping alarm limits same.
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Electronic refrigeration control, type ERC 21X

Figure 8: Night mode
Fan cycling during compressor OFF cycle
During compressor OFF cycle controller will run the fan with dened duty cycle to maintain uniform temperature
and delay the need of compressor switching ON.
Figure 9: Fan cycle
Danfoss 80G8475
Thermostat cut in
Thermostat cut out
Fan
Compressor
Fan ON
cycle
Fan OFF
cycle
Cabinet air temp.
Defrost on Demand
This feature records the evaporator temperature when it is clean and constantly monitors the compares that at
every compressor cut outs. If the evaporator temperature goes below the recorded temperature by the value set in
parameter d30 before the congured defrost interval, it will trigger defrost immediately.
• This function can only be used in 1:1 systems.
• This function is disabled when the parameter “d30” is set to 20.
• Defrost on demand is triggered only if the time since the last defrost session has ended is greater than ¼ of the
defrost interval or 2 hours whichever is lesser.
• Defrost doesn’t start by this method during the following scenarios.
◦Pull down mode
◦Night mode
◦Main switch in DI or main switch in Menu is in OFF position
◦Manual control mode
◦Evaporator temperature greater than 0 °C.
Electronic refrigeration control, type ERC 21X
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Applications
Pre-dened applications
The purpose of the pre-dened applications is to give the user an easy and fast way to congure the controller to a
specic application based on storage temperature (LT, MT, HT), defrost type (none, natural, electrical) and defrost
method (terminated on time or temperature).
When user select specic application based on their requirements, the controller will load a specic set of parameter
values and will hide parameters that are not relevant for the selected application. Adjustment of the set of
parameters value will be still possible at any time.
In addition to pre-dened applications, all controller versions have two standard applications, one with full list of
parameters and another with simplied list of parameters, that allows the user to make their own customized
parameter settings (AP0 and AP5 in case of ERC 211 and AP0 and AP6 in case of ERC 213 / ERC 214).
ERC 211 controller
Table 1: Pre-dened application table of ERC 211 controller
APP
Description
Temp. range
Defrost end
DO1
AI1
DI1(1)
AP0
Fully Congurable Standard Application (Cooling / Heating)
AP1
MT, No defrost
4 – 20 °C
NA
Sair
DI1
AP2
MT, Natural defrost
2 – 6 °C
Time
Sair
DI1
AP3
MT, Natural defrost, defrost stop by Sair
2 – 6 °C
Sair temp
Sair
DI1
AP4
Heating Thermostat
30 – 70 °C
NA
Sair
DI1
AP5
Fully congurable simplied application (Cooling / Heating)
(1) The digital inputs DI1 can be congured for multiple functions (refer parameter “o02”). (1) The digital inputs DI1 can be congured for multiple functions (refer parameter “o02”).
ERC 213 controller
Table 2: Pre-dened application table of ERC 213 controller
APP
Description
Temp.
range
Defrost
end
DO1
DO2
DO3
AI1
AI2
DI1(1)
DI2(1)
AP0
Fully Congurable Standard Application (Cooling / Heating)
AP1
MT, Natural defrost, Alarm, fan
2 – 6 °C
By time
Sair
NC
DI1/Sc
DI2
AP2
MT, Electrical defrost, Fan
0 – 4 °C
By time
Sair
NC
DI1/Sc
DI2
AP3
LT, Electrical defrost, fan
-24 – -18 °C
By time
Sair
NC
DI1/Sc
DI2
AP4
MT, Electrical defrost, Fan
0 – 4 °C
By
temp(S5)
Sair
S5
DI1/Sc
DI2
AP5
LT, Electrical defrost, Fan
-26 – -20 °C
By
temp(S5)
Sair
S5
DI1/Sc
DI2
AP6
Fully congurable simplied application (Cooling / Heating)
AP7
Heating Thermostat
30 – 70 °C
NA
Sair
NC
DI1
DI2
(1) The digital inputs DI1 and DI2 can be congured for multiple functions (refer Parameters “o02” and “o37”). (1) The digital inputs DI1 and DI2 can be congured for multiple functions (refer Parameters “o02” and “o37”).
NC = Not congured
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Electronic refrigeration control, type ERC 21X

ERC 214 controller
Table 3: Pre-dened application table of ERC 214 controller
APP
Description
Temp.
range
Defrost
end
DO1
DO2
DO3
DO4
AI1
AI2
DI1(1)
DI2(1)
AP0
Fully Congurable Standard Application (Cooling / Heating)
AP1
MT, Natural defrost, Alarm, fan
2 – 6 °C
By time
Sair
NC
DI1/Sc
DI2
AP2
MT, Electrical defrost, Fan
0 – 4 °C
By time
Sair
NC
DI1/Sc
DI2
AP3
LT, Electrical defrost, fan
-24 – -18
°C
By time
Sair
NC
DI1/Sc
DI2
AP4
MT, Electrical defrost, Fan
0 – 4 °C
By
temp(S5)
Sair
S5
DI1/Sc
DI2
AP5
LT, Electrical defrost, Fan
-26 – -20
°C
By
temp(S5)
Sair
S5
DI1/Sc
DI2
AP6
Fully congurable simplied application (Cooling / Heating)
AP7
Heating Thermostat
30 – 70 °C
NA
Sair
NC
DI1
DI2
(1) The digital inputs DI1 and DI2 can be congured for multiple functions (refer Parameters “o02” and “o37”) (1) The digital inputs DI1 and DI2 can be congured for multiple functions (refer Parameters “o02” and “o37”)
NC = Not congured
Electrical connection diagram
Table 4: Electrical connection diagram
Type
Connection diagrams
ERC 211
Not used
Danfoss 80G8370
DO1
12
Sair DI/Sc
GND GND
567
3L 4N 10 11 12 13 14
8 9
16 17 18 15
TX RX +5V GND
ERC 213
Not used
Danfoss 80G8371
DO1 DO2 DO3
12
Sair S5 Sc/DI1 DI2
GND GND
567
3L 4N 10 11 12 13 14
8 9
16 17 18 15
TX RX +5V GND
ERC 214
Not used
Danfoss 80G8372
DO1
12
Sair S5 Sc/DI1 DI2
GND GND
567
3L 4N 10 11 12 13 14
8 9
16 17 18 15
TX RX +5V GND
DO2 DO3 DO4
Electronic refrigeration control, type ERC 21X
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3L, 4N
Sair
S5
Sc
DI1
DI2
Power supply 115 V AC or 230 V AC (refer to the controller label).
Control Sensor
Defrost (evaporator) sensor
Condenser sensor
Digital input - congurable to the functions listed under menu code o02.
Digital input - congurable to the functions listed under menu code o37.
Electric noise
Cables for sensors and DI inputs must be kept separate from other electric cables:
• Use separate cable trays
• Keep a distance between cables of at least 10 cm
• Long cables at the DI input should be avoided.
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Electronic refrigeration control, type ERC 21X

Conguration
Menu navigation and overview
Table 5: Key functions
Scroll up: Short press (less than 1 second)
Main switch ON/OFF : Press and hold (~ 3 seconds)
Factory reset: Press and hold at Power up
Scroll down: Short press (Less than 1 sec.)
Defrost Start/Stop : Press and hold (~3 secs.)
Back function : Short press (less than 1 sec.)
Pull down start / stop : Press and hold (~3 secs.)
Set point change or OK : Short press (Less than 1 sec.)
Enter Menu : Press and hold (~ 3 secs.)
Table 6: Display icons
Night mode (Energy saving)
Fan running
Compressor running (Flashes in pull-down mode)
Active alarm
Defrost
Unit (°C or °F)
Quick conguration at power up
•STEP 1: power on
•STEP 2: select the quick conguration menu
Within 30 seconds of power on, press “<” BACK for 3 seconds. The main switch “r12” is automatically set to OFF.
•STEP 3: select pre-installed application o61
The display automatically shows the application selection parameter “o61”.
Press SET to select the pre-installed application.
The display shows the default value (eg. “AP0” ashing).
Choose the application type by pressing UP/DOWN and press SET to conrm.
The controller presets parameter values according to the selected application and does not hide relevant
parameters.
Tip: you can easily move from AP0 to AP6, and thus select the simplied list of parameters, by pressing the UP key
(circular list).
•STEP 4: select sensor type “o06
The display automatically shows sensor selection parameter “o06”.
Press SET to select the sensor type.
The display shows the default value (eg. “n10” ashing).
Choose sensor type by pressing UP/DOWN (n5=NTC 5 K, n10=NTC 10 K, Ptc=PTC, Pt1=Pt1000) and press SET to
conrm.
NOTE:
All sensors must be the same type.
•STEP 5: congure DO4 output “o36”
The display automatically shows the o36 parameter to congure “DO4” output. (Available only in 4 relays model).
Select light “Lig” or alarm “ALA” as per the application and press SET to conrm.
The display returns to normal display mode and the control is started.
NOTE:
Refer Pre-dened applications for a complete description of the available applications.
Electronic refrigeration control, type ERC 21X
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1.
2.
3.
4.
5.
6.
7.
8.
Figure 10: Conguration
1. Parameter groups
2. Parameter name
3. Value
Scroll through the
parameter groups
SET: press for 3 seconds to access
status, setup and service
Password (if enabled)
Status input
Configuration Main switch
Application
Sensor type
DO4 configuration
(only for 4 relays model)
Application 0
Application
1-2-3-4-5-6
Application
1-2-3-4-5-6
SET
Scroll through the
parameter names
SET
Danfoss 80G8452
Quick conguration via cFg menu
Press "SET" button for 3 seconds to access the parameter menu (display will show "cFg").
Enter “CFg” menu by pressing "SET" button (diaplay will show rst parameter "r12” main switch.
Select "r12" by pressing "SET" button again and set the main switch to "oFF" (r12=0).
Press back button (<) to come back to 'CFg" menu.
Press DOWN button to scroll through the "cFg" menu parameter list.
Open the “o61 application mode" and select needed application mode (Press SET).
Open the “o06 Sensor type” and select the temperature sensor type used (n5=NTC 5 K, n10=NTC 10 K, Ptc=PTC,
Pt1=Pt1000)- (Press “SET”).
Open the “o02 DI1 Conguration” and select the function associated to digital input 1 (Press “SET”).
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Electronic refrigeration control, type ERC 21X

9.
10.
11.
A
B
C
Danfoss 80G8453
A
B
C
Short press "SET" button (Setpoint ashes)
Press UP/DOWN button to change setpoint
Press "SET" button to save the changed setpoint
B
A
Danfoss 80G8454
A
B
Press "DEFROST" button for 3 seconds to initiate a defrost (Display
shows "-d-" during defrost)
Press "DEFROST" button again for 3 seconds to stop defrost.
Danfoss 80G8455
B
A
A
B
Press "PULL DOWN" button for 3 seconds to initiate pull down
(controller displays "Pud" during pull down)
Press "PULL DOWN" button again for 3 seconds to stop the pull down
Danfoss 80G8441
A
A
Temperature and alarm codes alternate ashes until the alarm is
resolved. The alarm bell is shown.
Open the “o37 DI2 Conguration” and select the function associated to digital input 2 (Press “SET”).
Navigate back to parameter “r12 Main switch” and set it in “ON” position to start control.
Go through other parameters default settings and change wherever needed
Figure 11: Adjust Setpoint
Figure 12: Initiate a manual defrost
Figure 13: Initiate a pull down
Figure 14: View active alarm
Electronic refrigeration control, type ERC 21X
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A
Danfoss 80G8442
A
After 5 minutes of no activity, the keypad is locked (if P76=yes).
When the keypad is locked any button press shows “LoC” in the display.
Press UP and DOWN buttons simultaneously for 3 seconds to unlock
the keyboard. “unl” is displayed for 3 seconds.
Figure 15: Unloack keyboard
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Electronic refrigeration control, type ERC 21X

Parameters
Menu functions
Conguration
Table 7: Conguration
Code
Parameter description
Min.
Max.
Unit
cFg
Conguration
r12
Main Switch
With this setting refrigeration can be started, stopped or a manual override of the outputs can be allowed.
Service (manual control of outputs allowed)(-1 in Controller Display)
OFF (0 in Controller Display)
ON (1 in Controller Display)
Service
ON
o61
Predened applications
Predened applications is to give the user an easy and fast way to congure the controller. Users can set appropriate applica-
tion that meets their requirements under this menu (please refer predened applications table under section 2.4 for more
details). Predened application is protected by main switch.
AP0
AP7
o07
Select main application type for which controller is used
rE= Cooling
Ht= Heating
rE
Ht
o06
Sensor type
This parameter denes the type of temperature sensors connected to the controller. Below sensor types can be used in
ERC21x
n5=NTC 5K (5000 Ohm at 25 °C, Beta value=3980 @25/100 °C)
n10= NTC 10 (10000 Ohm at 25 °C, Beta value = 3435 @ 25/100 °C)
pt1= PT1000
ptc= PTC
All the mounted sensors (Sair, S5 and Sc)must be of same type.
n10
pt1
o71
This parameter denes the desired conguration for Relay 2 (DO2)
dEF=Defrost
ALA=alarm
Lig=Light
dEF
Lig
o36
This parameter denes the desired conguration for Relay 4 (DO4). Applicable only for ERC214.
Lig=Light
ALA=alarm
Lig
ALA
Thermostat
Table 8: Thermostat
Code
Parameter description
Min.
Max.
Unit
r--
Thermostat
r00
SetPoint
This parameter denes the desired cabinet temperature at which compressor cuts out. The set point can be locked to a range
within r02 and r03 settings.
-100.0
200.0
°C
r01
Dierential
This denes the dierence between the cut-out and the cut-in of compressor relay. Compressor relay will cut-in when the
cabinet temperature reaches the set point+ dieretial. In case of heating application, heater will cut-in when the temperature
reaches the set point-dierential.
0.1
20.0
K
r02
Maximum Set Point limitation
The maximum allowable setpoint value can be congured here that would avoid setting too high values by mistake.
-100.0
200.0
°C
r03
Minimum Set Point limitation
The minimum allowable setpoint value can be congured here that would avoid setting too low values by accident/mistake.
-100.0
200.0
°C
r04
Display oset
Correction value in display temperature. If the temperature of the products / cabinet and the temperature received by the
controller are not identical, an oset adjustment of the display temperature can be carried out using this parameter.
-10.0
10.0
K
r05
Display Unit
Set here if the controller is to show temperature values in °C or in °F. Switching from one to the other will cause all tempera-
ture settings to be automatically updated to respective unit.
-C
-F
r09
Calibration of Sair
This parameter is a relative value and allows adjustment of the Sair sensor temperature. For instance, at a measured tempera-
ture of 7 °C and r09 set to 2K, the input from the Sair sensor will be 9 °C instead.
-20.0
20.0
K
r12
Main Switch
With this setting refrigeration can be started, stopped or a manual override of the outputs can be allowed. Stopped refrigera-
tion will give a “OFF” signal on the display.
-1=service (manual control of outputs allowed)
0=OFF
1=ON
-1
1
r13
Night setback value
The thermostat’s reference can be oset by this value during night or when there is no usage. Oset can be set both possitive
and negative sides (Select a negative value if there is to be cold accumulation). Activation can take place via digital input.
-50.0
50.0
K
Electronic refrigeration control, type ERC 21X
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Code
Parameter description
Min.
Max.
Unit
r40
Reference displacement oset 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 congured 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 congured 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 (O cycle defrost)
EL = Electrical defrost
gAS = Hot gas defrost
no
gAS
d02
Defrost stop temperature
This parameter denes at what temperature the defrost cycle will stop. Defrost can be stoped based on either evaporator
sensor or by the cabinet temperature sensor as dened in menu code d10.
0.0
50.0
°C
d03
Defrost interval
Denes 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 denes 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 oset 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

Code
Parameter description
Min.
Max.
Unit
d06
Drip-o time
This parameter denes the time delay to start the compressor after defrost heater being switched OFF. This delay is generally
provided to ensure all water droplets on the evaporator drips o before starting the refrigeration cycle.
0
60
min
d07
Fan delay after defrost
Denes how long the delay is between the start of the compressor and the fan after defrost cycle. This would help to avoid
hot air circulation in the cabinet imedietely after defrost.
0
60
min
d08
Fan start temperature after defrost
This only applies if an evaporator temperature sensor is tted. This parameter determines at what evaporator temperature
the fan will start after a defrost cycle is complete. If the time set in d07 occurs before the temperature set in d08, the fan will
start in line with d07. If the temperature set in d08 occurs rst, then the fan will start in line with d08.
-50.0
50.0
°C
d09
Fan during defrost
This parameter is to dene whether fan is to operate during defrost or not.
OFF
on
d10
Defrost Stop Sensor
This parameter is to dene which sensor has to be used to exit / terminate the defrost
non = none, defrost is based on time
Air = Sair sensor
dEF = S5 defrost sensor
non
dEF
d18
Compressor accumulated runtime to start defrost
When the accumulated compressor runtime is equal to the value set in this Parameter, defrost will be triggered. If the accu-
mulated compressor runtime is less than the set value during the dened defrost interval (d03), defrost will be triggered
based on the defrost interval (d03). This feature is disabled when this parameter is set to zero.
0
96
hour
d19
Defrost on demand
The controller will record S5 temperature during each defrost interval when the evaporator is clean and continue to monitor
S5 temperature. Controller triggers defrost if the S5 temperature becomes less than recorded temperature by this value it will
initiate the defrost on demand. This feature is disabled when this parameter is set to 20. This function can only be used in 1:1
systems.
0.0
20.0
K
d30
Defrost delay after pull down
This parameter denes the time delay to start the defrost after pull down cycle. This has to ensure defrost doesnot happen
immedietely after pull down cycle.
0
960
min
Fan
Table 11: Fan
Code
Parameter description
Min.
Max.
Unit
F--
Fan
F01
Fan control during compressor o cycle
This parameter dene the fan operation during compressor o cycle.
FAo=Fan always ON
FFC=Fan follow compressor (Fan is switched o during compressor o cycle)
FPL= Fan Cycling
FAo
FPL
F04
Fan stop evaporating temperature
This parameter denes the maximum evaporator temperature at which the Fan must switch OFF. If the defrost sensor regis-
ters a higher temperature than the one set here, the fans will be stopped to avoid the warm air circulation in the cabinet.
-50.0
50.0
°C
F07
Fan On cycle
This parameter is applicable only when the Fan at Compressor cut out (F01) is set to Fan cycling mode. The Fan ON time will
be as per the time set in this parameter.
0
180
min
F08
Fan OFF cycle
This parameter is applicable only when the Fan at Compressor cut out (F01) is set to Fan cycling mode. The Fan OFF time will
be as per the time set in this parameter.
0
180
min
Compressor
Table 12: Compressor
Code
Parameter description
Min.
Max.
Unit
c--
Compressor
C01
Compressor minimum ON time
This parameter determines the minimum number of minutes the compressor must run before a cut-out can take eect based
on temperature. This is to avoid sudden switching ON and OFF of the compressor. When used for Heating application, sug-
gest to set this value 0 to avoid any overheating.
0
30
min
C02
Compressor minimum OFF time
This parameter determines the minimum number of minutes the compressor must switched OFF before a cut-in can take
eect based on temperature. This is to avoid sudden switching OFF and ON of the compressor.
0
30
min
C04
Compressor OFF delay at door open
This parameter sets the delay to stop the compressor when the door is opened. If set to 900, the function is disabled.
0
900
sec
C70
Zero crossing selection
This feature will increase the relay life time, reduce the contact welding and switching noise by switching ON at Zero crossing.
Disable zero crossing when external relay is used.
no
YES
Electronic refrigeration control, type ERC 21X
© Danfoss | Climate Solutions | 2023.01 BC194286421698en-000901 | 20