Manuals+

Danfoss ERC 21X Series Electronic Refrigeration Control

User Guide

Introduction

Application

The ERC 21X is a smart multipurpose refrigeration controller designed for commercial refrigeration applications. It 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 setups.

General description

The ERC 21X controller features four push buttons, a large display, and an intuitive menu structure with pre-defined applications for ease of use. It incorporates energy efficiency features such as smart evaporator fan management, night mode, and defrost-on-demand. The high-capacity 16 A relay allows direct connection of heavy loads, supporting up to 2 hp compressors depending on their power factor and motor efficiency. Safety features include voltage protection, zero cross switching, and high condenser temperature protection.

ERC 21X series

The ERC 21X series is available in 230 V AC, 50/60 Hz, and 115 V AC, 60 Hz versions:

ERC 211

The ERC 211 has one relay output and two inputs (1 analogue, 1 analogue/digital). It can be used for cooling or heating applications.

Figure 1: ERC 211 Wiring Diagram

The ERC 211 features:

ERC 213

The ERC 213 offers three relay outputs and four inputs (2 analogue, 1 analogue/digital, 1 digital) for cooling and heating applications.

Figure 2: ERC 213 Wiring Diagram

The ERC 213 features:

ERC 214

The ERC 214 provides four relay outputs and four inputs (2 analogue, 1 analogue/digital, 1 digital) for cooling applications.

Figure 3: ERC 214 Wiring Diagram

The ERC 214 features:

Functions

Voltage protection

Ensures the compressor operates within safe voltage ranges. If the power supply voltage exceeds specified limits, the compressor is cut out or restricted from starting. Operation resumes when voltage returns to the safe range.

Figure 4: Voltage Protection Graph

The graph illustrates voltage protection, showing high voltage limits and low voltage cut-in/cut-out limits for compressor operation.

Compressor protection

Protects the compressor from short ON/OFF cycles by enforcing minimum run and stop times, allowing the refrigeration system to stabilize and preventing excessive cycling.

Figure 5: Compressor Protection Graph

The graph depicts compressor protection, illustrating minimum run time, minimum stop time, and the ON/OFF cycles of the compressor based on temperature.

Compressor protection against high condensing temperature

Monitors condenser temperature. If it becomes too high due to dirt or a faulty fan, the controller issues a warning alarm. If the temperature continues to rise, it triggers a block alarm and stops the compressor. The alarm can be reset manually.

Figure 6: Compressor Protection Against High Condensing Temperature Graph

This graph shows how condenser temperature (Sc) affects compressor operation, indicating pre-alarm and block alarm thresholds and manual reset actions.

Reference displacement

Allows quick switching between two set-points using a digital input, enabling different storage temperatures without menu navigation. The reference displacement signal adjusts the thermostat set-point and alarm limits.

Figure 7: Reference Displacement Graph

The graph illustrates how cabinet temperature varies with reference displacement activation, showing changes in thermostat set-points and alarm limits over time.

Night mode

Helps reduce cooling load and power consumption during non-business hours by offsetting the thermostat set-point with a fixed value, while keeping alarm limits unchanged.

Figure 8: Night Mode Graph

The graph shows the typical operation during night mode, indicating temperature setpoint adjustments.

Fan cycling during compressor OFF cycle

The controller operates the fan with a defined duty cycle during compressor OFF periods to maintain uniform temperature and delay the need for compressor restart.

Figure 9: Fan Cycle Graph

The graph illustrates fan operation cycles during compressor OFF periods, showing fan ON and OFF times relative to cabinet air temperature.

Defrost on Demand

Records evaporator temperature after each compressor cutout. If the evaporator temperature drops below the recorded value (by a set parameter) before the configured defrost interval, defrost is triggered immediately. This feature is only for 1:1 systems and is disabled if parameter 'd30' is set to 20. Defrost is triggered if the time since the last defrost is greater than 1/4 of the interval or 2 hours, whichever is less. It does not start during pull-down mode, night mode, if the main switch is OFF, or if the evaporator temperature is above 0 °C.

Applications

Pre-defined applications

Pre-defined applications simplify controller configuration by automatically setting relevant parameters based on storage temperature (LT, MT, HT), defrost type (none, natural, electrical), and defrost method (time or temperature termination). Users can select an application, and the controller loads specific parameter values, hiding irrelevant ones. Custom parameter settings are also possible.

ERC 211 controller

Table 1: Pre-defined application table of ERC 211 controller

APP Description Temp. range Defrost end DO1 AI1 DI1(1)
AP0Fully Configurable Standard Application (Cooling / Heating)
AP1MT, No defrost4 – 20 °CNASairDI1
AP2MT, Natural defrost2 – 6 °CTimeSairDI1
AP3MT, Natural defrost, defrost stop by Sair2 – 6 °CSair tempSairDI1
AP4Heating Thermostat30 – 70 °CNADI1
AP5Fully configurable simplified application (Cooling / Heating)

(1) The digital inputs DI1 can be configured for multiple functions (refer parameter "o02").

ERC 213 controller

Table 2: Pre-defined application table of ERC 213 controller

APP Description Temp. range Defrost end DO1 DO2 DO3 AI1 AI2 DI1(1) DI2(1)
AP0Fully Configurable Standard Application (Cooling / Heating)
AP1MT, Natural defrost, Alarm, fan2 – 6 °CBy timeSairNCDI1/ScDI2
AP2MT, Electrical defrost, Fan0 – 4 °CBy timeSairNCDI1/ScDI2
AP3LT, Electrical defrost, fan-24 – -18 °CBy timeSairNCDI1/ScDI2
AP4MT, Electrical defrost, Fan0 – 4 °CBy temp(S5)SairS5DI1/ScDI2
AP5LT, Electrical defrost, Fan-26 – -20 °CBy temp(S5)SairS5DI1/ScDI2
AP6Fully configurable simplified application (Cooling / Heating)
AP7Heating Thermostat30 – 70 °CNASairNCDI1DI2

(1) The digital inputs DI1 and DI2 can be configured for multiple functions (refer Parameters "o02" and "o37"). NC = Not configured

ERC 214 controller

Table 3: Pre-defined application table of ERC 214 controller

APP Description Temp. range Defrost end DO1 DO2 DO3 DO4 AI1 AI2 DI1(1) DI2(1)
AP0Fully Configurable Standard Application (Cooling / Heating)
AP1MT, Natural defrost, Alarm, fan2 – 6 °CBy timeSairNCDI1/ScDI2
AP2MT, Electrical defrost, Fan0 – 4 °CBy timeSairNCDI1/ScDI2
AP3LT, Electrical defrost, fan-24 – -18 °CBy timeSairNCDI1/ScDI2
AP4MT, Electrical defrost, Fan0 – 4 °CBy temp(S5)SairS5DI1/ScDI2
AP5LT, Electrical defrost, Fan-26 – -20 °CBy temp(S5)SairS5DI1/ScDI2
AP6Fully configurable simplified application (Cooling / Heating)
AP7Heating Thermostat30 – 70 °CNASairNCDI1DI2

(1) The digital inputs DI1 and DI2 can be configured for multiple functions (refer Parameters "o02" and "o37"). NC = Not configured

Electrical connection diagram

Table 4: Electrical connection diagram

Type Connection diagrams GND TX RX +5V GND
12L3L4N56789101112131415161718
ERC 211DO1Not usedSairDI/Sc
115/ 230V115/ 230V
ERC 213DO1DO2DO3Not usedSairS5 Sc/DI1DI2
115/ 230V115/ 230V
ERC 214DO1DO2DO3DO4Not usedSairS5 Sc/DI1DI2
115/ 230V115/ 230V

Terminal Descriptions:

Notes on Wiring:

Configuration

Menu navigation and overview

Table 5: Key functions

Button Action Function Button Action Function
Scroll up (Short press < 1 sec)Scroll down (Short press < 1 sec)
Main switch ON/OFF (Press & hold ~3 sec)Defrost Start/Stop (Press & hold ~3 sec)
Factory reset (Press & hold at Power up)Set point change or OK (Short press < 1 sec)
Back function (Short press < 1 sec)Enter Menu (Press & hold ~3 sec)
Pull down start / stop (Press & hold ~3 sec)

Table 6: Display icons

Icon Description Icon Description
( )Night mode (Energy saving)Fan running
Compressor running (Flashes in pull-down mode)Active alarm
DefrostUnit (°C or °F)

Quick configuration at power up

  1. Power on the controller.
  2. Within 30 seconds, press the "<" BACK button for 3 seconds to enter the quick configuration menu. The main switch (r12) is automatically set to OFF.
  3. Select the pre-installed application (parameter "o61") by pressing SET. Choose the application type using UP/DOWN buttons and press SET to confirm. The controller will set default parameters for the selected application. Users can cycle through simplified parameter lists (AP0 to AP6) using the UP key.
  4. Select the sensor type (parameter "o06") by pressing SET. Choose the sensor type (NTC 5K, NTC 10K, PTC, Pt1000) using UP/DOWN buttons and press SET. All sensors must be of the same type.
  5. Configure the DO4 output (parameter "o36") for 4-relay models. Select "Lig" (Light) or "ALA" (Alarm) and press SET.

The controller then returns to normal display mode and starts operation.

Quick configuration via cFg menu

  1. Press "SET" for 3 seconds to access the parameter menu (display shows "cFg").
  2. Enter "CFg" by pressing "SET" (displays "r12" main switch).
  3. Select "r12" by pressing "SET" again and set the main switch to "OFF" (r12=0).
  4. Press "<" BACK to return to "cFg" menu.
  5. Press DOWN to scroll through the "cFg" menu.
  6. Open "o61 application mode" and select the application (Press SET).
  7. Open "o06 Sensor type" and select the sensor type (n5, n10, Ptc, Pt1) (Press SET).
  8. Open "o02 DI1 Configuration" and select the function for digital input 1 (Press SET).
  9. Open "o37 DI2 Configuration" and select the function for digital input 2 (Press SET).
  10. Navigate back to "r12 Main switch" and set it to "ON" to start control.
  11. Adjust other parameters as needed.

Adjust Setpoint

Figure 11: Adjust Setpoint

Initiate a manual defrost

Figure 12: Initiate a manual defrost

Initiate a pull down

Figure 13: Initiate a pull down

View active alarm

Figure 14: View active alarm

The display alternates between actual air temperature and alarm codes. The alarm bell icon is shown when an alarm is active.

Unlock keyboard

Figure 15: Unlock keyboard

Factory resetting

To reset to factory settings:

  1. Power OFF the controller.
  2. Press and hold UP and DOWN arrow buttons while reconnecting power.
  3. When "Fac" is displayed, select "yes".

Note: The OEM factory setting can be either Danfoss defaults or a user-defined setting saved via parameter o67.

Display codes

Table 7: Display codes

Code Description
-d-Defrost cycle is in progress
PudA temperature pulldown cycle has been initiated
ErrTemperature cannot be displayed due to sensor error
--- (top)Parameter value reached max limit
--- (bottom)Parameter value reached min limit
LocDisplay keyboard is locked
UnLDisplay keyboard has been unlocked
PSAccess code required to enter parameter menu
Axx/ExxAlarm or error code flashing with normal temp. readout
OFFControl is stopped (r12 Main switch OFF)
OnControl is started (r12 Main switch ON)
FacController reset to factory setting

Parameters

Parameter description

Table 8: Configuration Parameters

Code Parameter description Min. Max. Unit
cFgConfiguration
r12Main Switch-11Service ON
o61Predefined applicationsAP0AP7
o07Cooling/Heating selectionrEHt
o06Sensor typen5ptc
o71DO2 configurationdEFLig
o36DO4 configurationLigALA

Table 9: Thermostat Parameters

Code Parameter description Min. Max. Unit
r00SetPoint-100.0200.0°C
r01Differential0.120.0K
r02Maximum Set Point limitation-100.0200.0°C
r03Minimum Set Point limitation-100.0200.0°C
r04Display offset-10.010.0K
r05Display Unit-C-F
r09Calibration of Sair-20.020.0K
r12Main Switch-11
r13Night setback value-50.050.0K

Alarm settings

Table 10: Alarm settings

Code Parameter description Min. Max. Unit
A03Delay for temperature alarm during normal conditions0240min
A12Delay for temperature alarm during pull-down/start-up/defrost0240min
A13High temperature alarm limit-100.0200.0°C
A14Low temperature alarm limit-100.0200.0°C
A27DI1 delay0240min
A28DI2 delay0240min
A37Condenser high alarm limit0200°C
A54Condenser High block limit0200°C
A72Voltage protection enablenoYES
A73Minimum cut-in voltage0270V
A74Minimum cut-out voltage0270V
A75Maximum voltage0270V

Defrost

Table 11: Defrost Parameters

Code Parameter description Min. Max. Unit
d01Defrost typenogAS
d02Defrost stop temperature0.050.0°C
d03Defrost interval0240hour
d04Maximum defrost time0480min
d05Defrost delay at power up or DI signal0240min
d06Drip-off time060min
d07Fan delay after defrost060min
d08Fan start temperature after defrost-50.050.0°C
d09Fan during defrostOFFon
d10Defrost Stop SensornondEF
d18Compressor accumulated runtime to start defrost096hour
d19Defrost on demand0.020.0K
d30Defrost delay after pull down cycle0960min

Fan Control

Table 12: Fan Control Parameters

Code Parameter description Min. Max. Unit
F01Fan control during compressor off cycleFAoFPL
F04Fan stop evaporating temperature-50.050.0°C
F07Fan ON Cycle0180min
F08Fan OFF cycle0180min

Compressor

Table 13: Compressor Parameters

Code Parameter description Min. Max. Unit
C01Compressor minimum ON time030min
C02Compressor minimum OFF time030min
C04Compressor OFF delay at door open0900sec
C70Zero crossing selectionnoYES

Others

Table 14: Miscellaneous Parameters

Code Parameter description Min. Max. Unit
o01Delay of outputs at startup0600sec
o02DI1 configurationnCSc
o03Serial Address0247No
o05Password0999No
o15Display Resolution0.11.0
o37DI2 configurationnCPud
o38Light Controlondoo
o67Save settings as factorynoYES
o91Display during defrostAir-d-
P73DI1 input polaritynonc
P74DI2 input polaritynonc
P75Invert alarm relay01
P76Key board lock enablenoYES

Service

Table 15: Service Parameters

Code Parameter description Min. Max. Unit
u00Controller Status
u01Temperature measured by Sair sensor
u02Reference set point used for the control
u09Temperature measured by evaporator sensor
u10Status of connected Digital input configured to DI1OpenClose
u13Shows status of night modeONOFF
u37Status of connected Digital input configured to DI2OpenClose
u29Temperature measured by condenser Sensor
u58Status of compressor relayON/OFF
u59Status of Fan relayON/OFF
u60Status of Defrost relayON/OFF
u63Status of Light relayON/OFF
o23Relay 1 counter0999
o24Relay 2 counter0999
o25Relay 3 counter0999
o26Relay 4 counter0999
u80Firmware version readout
u82Controller code number

Parameters: ERC 211 Configuration

Table 16: Configuration

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5
ConfigurationcFg
Main switch (-1=Service, 0=OFF, 1=ON)r12-11111111
Predefined applicationso61(2)AP0AP5AP0AP1AP2AP3AP4AP5
Cooling/Heating (rE=Cooling, Ht= Heating)o07(2)rEHtrErE(1)rE(1)rE(1)Ht(1)rE
Sensor type selection (n5=NTC 5K, n10=NTC10K, ptc=PTC, pt1=PT1000)o06(2)n5ptcn10n10n10n10n10n10

Reference

Table 17: Reference Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5
Setpointr00-100.0200.0°C2.08.04.04.050.02.0
Differentialr010.120.0K2.02.02.02.02.02.0
Maximum set point limitationr02-100.0200.0°C50.020.06.06.070.050.0
Minimum set point limitationr03-100.0200.0°C-35.04.02.02.030.0-35.0
Display offsetr04-10.010.0K0.00.00.00.00.00.0
Display Unit (°C/°F)r05-C-F-C-C-C-C-C-C
Calibration of Sairr09-20.020.0K0.00.00.00.00.0-
Main switch (-1=Service, 0=OFF, 1=ON)r12-11111111
Night Set backr13-50.050.0K0.00.00.00.00.00.0
Reference displacement offset temperaturer40-50.020.0°C0.00.00.00.00.0-
Pull down durationr960960min0-00--
Pull down limit temperaturer97-100.0200.0°C0.0-0.00.0--

Alarm

Table 18: Alarm Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5
Delay for temp alarm during normal conditionsA030240min304545451030
Delay for temp alarm during pull-down/start up/ defrostA120240min60609090NA60
High temp. alarm limitA13-100.0200.0°C8.016.010.010.080.08.0
Low temp. alarm limitA14-100.0200.0°C-30.00.00.00.010.0-30.0
DI1 delay (Time delay for selected DI1 function)A270240min303030303030
Condenser High alarm limitA370200°C80808080--
Condenser High block limitA540200°C85858585--
Voltage protection enableA72noYESnononononono
Minimum cut-in voltageA730270V000000
Minimum cut-out voltageA740270V000000
Maximum voltageA750270V270270270270270270

Defrost

Table 19: Defrost Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5
Defrost Method (no=None, nAt=Natural, EL = Electric; gAS=Hot gas)d01nogASELnAtELELELEL
Defrost stop temperatured020.050.0°C6.0--8.0-6.0
Defrost Intervald030240hour8.0-6.06.0-8.0
Max defrost Timed040480min30-4560-30
Defrost delay at power up (or DI signal)d050240min0-00--
Drip delayd06060min0-00--
Fan delay after defrostd07060min0-00--
Fan start temperature after defrostd08-50.050.0°C-5.050.0(1)50.0(1)50.0(1)-5.0-5.0
Fan during defrostd09OFFonononOFFOFFOFFOFF
Defrost stop sensord10nondEFnonnon(1)non(1)non(1)dEF(1)dEF(1)non
Accumulated Compressor runtime to start defrost (0=OFF)d18096hour0-00--
Defrost on demand (20=OFF)d190.020.0K20.020.0(1)20.0(1)20.0(1)20.020.0
Defrost delay after pull down cycled300960min0-00--

Fan Control

Table 26: Fan Control Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5 AP6 AP7
Fan controlF--
Fan at compressor cutout (FAo=Fan always ON; FFC=Fan follow compressor; FPL= Fan Pulsating)F01FAoFPLFAoFAoFAoFAoFAoFAoFAoFAo
Fan stop evaporating temperatureF04-50.050.0°C50.0---50.050.050.0-
Fan ON CycleF070180min222222(1)22
Fan OFF cycleF080180min222222(1)22

Compressor

Table 27: Compressor Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5 AP6 AP7
CompressorC--
Compressor / Heater minimum ON timeC01030min00000000
Compressor / Heater minimum OFF timeC02030min22222222
Compressor OFF delay at open doorC040900Sec90090090090090090060(1)900
Zero crossing selection (YES / no)C70noYESYESYESYESYESYESYESYES(1)YES

Others

Table 28: Others Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5 AP6 AP7
Delay of outputs at startupo010600sec10101010101010(1)10
DI1 configurationo02nCScnCnCnCnCnCnCnCnC
Serial addresso030247No000000-0.0
Passwordo050999No00000000
Sensor type selection (n5=NTC 5K, n10=NTC10K, ptc=PTC, pt1=PT1000)o06(2)n5ptcn10n10n10n10n10n10n10n10
Cooling/Heating (rE=Cooling, Ht= Heating)o07(2)rEHtrErE(1)rE(1)rE(1)rE(1)rE(1)rEHt(1)
Display Resolutiono150.11.00.10.10.10.10.10.10.1(1)0.1
DI2 configurationo37nCPudnCnCnCnCnCnCnCnC
Light Controlo38ondooonononononononon
Predefined applicationso61(2)AP0AP7AP0AP1AP2AP3AP4AP4AP6AP7
Save settings as factoryo67noYESnononononono-no
DO2 config (dEF=Defrost; ALA=alarm; Lig=Light)o71(2)dEFLigdEFALA(1)dEF(1)dEF(1)dEF(1)dEF(1)dEFALA(1)
Display during defrosto91Air-d--d--d--d--d--d--d--d-(1)-

Polarity

Table 21: Polarity Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5
DI1 input polarity (nc/no)P73noncnononononono
DI2 input polarity (nc/no)P74noncnononononono
Invert alarm relay (0= normal, 1= invert relay action)P7501000000
Key board lock (no / yes)(0=no, 1=yes)P76noYESnonononono-

Parameters: ERC 214

Configuration

Table 30: Configuration Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5 AP6 AP7
ConfigurationcFg
Main switch (-1=Service, 0=OFF, 1=ON)r12-1111111111
Predefined applicationso61(2)AP0AP7AP0AP1AP2AP3AP4AP4AP6AP7
Cooling/Heating (rE=Cooling, Ht= Heating)o07(2)rEHtrErE(1)rE(1)rE(1)rE(1)rE(1)rEHt(1)
Sensor type selection (n5=NTC 5K, n10=NTC10K, ptc=PTC, pt1=PT1000)o06(2)n10pt1n10n10n10n10n10n10n10n10
DO2 config (dEF=Defrost; ALA=alarm; Lig=Light)o71(2)dEFLigdEFALA(1)dEF(1)dEF(1)dEF(1)dEF(1)dEFALA(1)
DO4 config (Lig=Light, ALA=Alarm)o36(2)LigALALigLigLigLigLigLigLigLig

Reference

Table 31: Reference Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5 AP6 AP7
Setpointr00-100.0200.0°C2.04.02.0-20.02.0-24.02.050.0
Differentialr010.120.0K2.02.02.02.02.02.02.04.0
Maximum set point limitationr02-100.0200.0°C50.06.04.0-18.04.0-20.050.070.0
Minimum set point limitationr03-100.0200.0°C-35.02.00.0-24.00.0-26.0-35.030.0
Display offsetr04-10.010.0K0.00.00.00.00.00.00.00.0
Display Unit (°C/°F)r05-C-F-C-C-C-C-C-C-C-C
Calibration of Sairr09-20.020.0K0.00.00.00.00.00.00.00.0

Alarm

Table 32: Alarm Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5 AP6 AP7
Delay for temp alarm during normal conditionsA030240min3045303030303010
Delay for temp alarm during pull-down/start up/ defrostA120240min60906060606060-
High temp. alarm limitA13-100.0200.0°C8.010.08.0-15.08.0-15.08.080.0
Low temp. alarm limitA14-100.0200.0°C-30.00.0-2.0-30.0-2.0-30.0-30.020.0
DI1 delay (Time delay for selected DI1 function)A270240min3030303030303030
DI2 delay (Time delay for selected DI2 function)A280240min3030303030303030
Condenser High alarm limitA370200°C808080808080--
Condenser High block limitA540200°C858585858585--
Voltage protection enableA72noYESnononononononono
Minimum cut-in voltageA730270V00000000
Minimum cut-out voltageA740270V00000000
Maximum voltageA750270V270270270270270270270270

Defrost

Table 33: Defrost Parameters

Function Code Min. Max. Unit AP0 AP1 AP2 AP3 AP4 AP5 AP6 AP7
Defrost Method (no=None, nAt=Natural, EL = Electric; gAS=Hot gas)d01nogASELnAtELELELELEL-
Defrost stop temperatured020.050.0°C6.0---6.06.06.0-
Defrost Intervald030240hour868128128-
Max defrost Timed040480min30451515303030-
Defrost delay at power up (or DI signal)d050240min000000--
Drip delayd06060min0000002(1)-
Fan delay after defrostd07060min0000005(1)-
Fan start temperature after defrostd08-50.050.0°C-5.050.0(1)50.0(1)50.0(1)-5.0-5.0NA-
Fan during defrostd09OFFonononOFFOFFOFFOFFOFF-
Defrost stop sensord10nondEFnonnon(1)non(1)non(1)dEF(1)dEF(1)non-
Accumulated Compressor runtime to start defrost (0=OFF)d18096hour0-00----
Defrost on demand (20=OFF)d190.020.0K20.020.0(1)20.0(1)20.0(1)20.020.0--
Defrost delay after pull down cycled300960min0-00----

Alarm Codes

In an alarm situation, the display alternates between the actual air temperature and alarm codes. Various alarm codes and their descriptions are:

Table 38: Alarm codes

Code Alarms Description
E29Sair sensor errorAir temperature sensor is defect or electrical connection is lost
E27Def sensor errorS5 Evaporator sensor is defect or electrical connection is lost
E30Sc sensor errorSc Condenser sensor is defect or electrical connection is lost
A01High temp alarmAir temperature in cabinet is too high
A02Low temp alarmAir temperature in cabinet is too low
A99High Volt alarmSupply voltage is too high (compressor protection)
AA1Low Volt alarmSupply voltage is too low (compressor protection)
A61Condenser alarmCondenser temp. too high - check air flow
A80Cond. block alarmCondenser temp. too high - manual reset of alarm required(1)
A04Door alarmDoor has been open for too long
A15DI AlarmExternal alarm from DI input
A45Standby AlarmControl has been stopped by "r12 Main switch"

(1) The condenser block alarm can be reset by setting r12 Main switch OFF and ON again or by powering down the controller.

Product specification

Technical specification

Table 39: Technical specification

Features Description
Purpose of controlOperating temperature sensing control suitable for incorporation into commercial air-conditioning and refrigeration applications
Construction of controlIncorporated control
Power supply115 V AC / 230 V AC 50/60 Hz, galvanic isolated low voltage regulated power supply
Rated powerLess than 0.7 W
InputsSensor inputs, Digital inputs, Programming key Connected to SELV limited energy <15 W
Allowed sensor typesNTC 5000 Ohm at 25 °C, (Beta value=3980 at 25/100 °C - EKS 211)
NTC 10000 Ohm at 25 °C, (Beta value=3435 at 25/85 °C - EKS 221)
PTC 990 Ohm at 25 °C, (EKS 111)
Pt1000, (AKS 11, AKS 12, AKS 21)
Sensors included in kit SolutionNTC 10000 Ohm at 25 °C, cable length: 1.5 m
AccuracyMeasuring range: -40–105 °C (-40 – 221 °F)
Controller accuracy: ±1 K below -35 °C, ±0.5 K between -35 -25 °C ±1 K above 25 °C
Type of action1B (relay)
OutputDO1 - Relay 1: 16 A, 16 (16) A, EN 60730-1
10 FLA / 60 LRA at 230 V, UL60730-1
16 FLA/72 LRA at 115 V, UL60730-1

DO2 - Relay 2: 8 A, 2 FLA/12 LRA, UL60730-1
8 A, 2 (2 A), EN60730-1

DO3 - Relay 3: 3 A, 2 FLA/12 LRA, UL60730-1
3 A, 2 (2 A), EN60730-1

DO4 - Relay 4: 2 A
DisplayLED display, 3 digits, decimal point and multi-function icons, °C + °F scale
Operating conditions-10+55 °C (14-131 °F), 90% Rh
Storage conditions-40-+70 °C (-40- +158°F), 90% Rh
ProtectionFront: IP65 (Gasket integrated)
Rear: IP00
Environmental Pollution degree II, non-condensing
Overvoltage categoryII - 230 V supply version - (ENEC, UL recognized)
III - 115 V supply version - (UL recognized)
Resistance to heat and fireUL94-V0
Temperature for ball pressure test statement According to Annex G (EN 60730-1)
EMC categoryEmission: IEC/EN 61000 6-3, Immunity: IEC/EN 61000 6-2

Mounting

Figure 16: Mounting

Figure 17: Dismounting

Installation steps:

Dimensions

Figure 18: Dimensions (mm)

The controller has dimensions of 83 mm width. The rear mounting (lock with clips) requires a space of 61.2 mm depth. The drilling template indicates specific cutout dimensions.

Accessories

KoolKey (EKA200)

KoolKey acts as a gateway to connect to the PC tool KoolProg and also functions as a programming key.

Figure 19: KoolKey (EKA 200) as gateway

Shows KoolKey connected to a controller via an interface cable, with a USB cable connecting to a PC.

Figure 20: KoolKey (EKA 200) as programming key

Illustrates KoolKey used as a programming key for the controller.

Refer to the KoolKey installation guide for detailed instructions.

Mass Programming Key (EKA 201)

A simple programming key for programming controllers during production assembly.

Figure 21: Mass Programming Key (EKA 201)

Shows the EKA 201 connected to the controller via an interface cable.

Refer to the EKA 201 installation guide for detailed instructions.

Bluetooth Adapter (EKA 202 & EKA 203)

An external plug-in module providing wireless connectivity with the Danfoss mobile application "KoolConnect".

Figure 22: Bluetooth Adapter (EKA 202 & EKA 203)

Shows the Bluetooth adapter connected to the controller via an interface cable.

Refer to the EKA 202/203 installation guide for detailed instructions.

Ordering

Table 40: ERC 21X controllers

Type Description Relay Qty. Code no.
ERC 211ERC 211, Red LED, 115 V - Kit11080G3451
ERC 211, Red LED, 230 V - Kit11080G3453
ERC 211, Controller, Red LED, 230 V11080G3454
ERC 211, Controller, Red LED, 230 V, I-Pack130080G3459
ERC 213ERC 213, Red LED, 230 V - Kit31080G3457
ERC 213, Controller, Red LED, 230 V31080G3458
ERC 213, Controller, Red LED, 230 V, I-Pack330080G3460
ERC 213 Red, 115 V USA - Kit31080G3467
ERC 213 Red, 230 V USA - Kit31080G3469
ERC 214ERC 214, Controller, Red LED, 115 V - Kit41080G3466
ERC 214, Controller, Red LED, 230 V - Kit41080G3463

Table 41: Programming tools and other accessories

Type Description Qty. Code no.
EKA 200KoolKey - Gateway cum Programming key1080N0020
EKA 201Mass Programming Key1080N0021
BLE Adapter Without RTC power back upSingle pack080N0022
With RTC power back up54080N0026
Interface cable Interface cable for ERC 21x, 1 mSingle pack080N0023
Interface cable for ERC 21x, 0.5 m54080N0027
1080N0326
1080N0327

Table 42: Sensors

Type Sensor element Sensor housing Cable Qty. Code no.
EKS 211NTC 5000 ohm / 25 °C (Beta =3980 at 25/100 °C)Thermo plastic polyester 8x301.5 m150084B4403
Thermo plastic polyester 8x303.5 m75084B4404
Thermo plastic polyester 8x301.5 m1084N1220
Thermo plastic polyester 8x303.5 m1084N1221
EKS 221NTC 10000 ohm / 25 °C (Beta =3435 at 25/85 °C)Thermo plastic rubber 6x5x153.5 m150084N3206
Thermo plastic rubber 6x5x153.5 m1084N3210
Thermo plastic rubber 6x5x158.5 m50084N3208
Thermo plastic rubber 6x5x158.5 m1084N3209
EKS 111PTC 990 ohm / 25 °CStainless steel 6x201.5 m150084N3200
Stainless steel 6x301.5 m1084N1178
Stainless steel 6x301.5 m150084N1161
Stainless steel 6x303.5 m1084N1179
Stainless steel 6x303.5 m150084N1163
Stainless steel 6x306 m1084N1180
Stainless steel 6x306 m80084N1173
Stainless steel 6x308.5 m60084N1168
AKS 11PT1000Top part: PPO (Noryl)
Bottom: stainless steel		3.5 m1084N0003
Top part: PPO (Noryl)5.5 m1084N0005
Top part: PPO (Noryl)8.5 m1084N0008
AKS 12PT1000Stainless steel 6x401.5 m1084N0036
Stainless steel 6x401.5 m30084N0035
Stainless steel 6x403.5 m30084N0039
Stainless steel 6x405.5 m30084N0038

Note: All mounted sensors must be of the same type.

Certificates, declarations, and approvals

This list includes certificates, declarations, and approvals for this product type. Individual code numbers may have some or all of these approvals. Some approvals may change over time; check danfoss.com or contact a local Danfoss representative for the most current status.

Table 43: Certificates, declarations, and approvals

Regulatory and Compliance Directive / Document topic Standards Country - Marking
Electrical Safety (Incorporated Control for use in Class I or Class II equipment)Low Voltage Directive: 2014/35/EUEN IEC 60730-2-9:2019, EN IEC 60730-2-9:2019/A1:2019, EN IEC 60730-2-9:2019/A2:2020, EN 60730-1:2016, EN 60730-1:2016/A1:2019, EN 60730-1:2016/A2:2022Europe - CE
Electrical Safety (control is validated to use as Incorporated)Recognized ComponentUL 60730-1 - 2009 - Revision 2014, UL 60730-2-9 : 2010, Revision : 2013United States - CURUS
Electrical Safety (control is validated to use as Incorporated)Recognized ComponentCSA E60730-1 :2013, CSA E60730-2-9 : 2001, Revision : 2008, AMD 1Canada - CURUS
Electrical Safety (Incorporated Control for use in Class I or Class II equipment)-GB 14536.1:2008, GB 14536.10:2008China - CQC
Electrical Safety & Electromagnetic CompatibilitySupplier Declaration of Conformity (SDoC)EN 60730-1:2016, EN 60730 2-9:2019, EN 610006-2:2005 & EN 61000-6-3:2007+A1:2011Ukraine - UA
Electrical SafetyCertification of Conformity (CoC)CU TR 004/2011Eurasia - EAC
Electromagnetic CompatibilityEMC Directive: 2014/30/EUEN 610006-2:2005 & EN 61000-6-3:2007+A1:2011Europe - CE
RoHSRoHS Directive: 2011/65/EU & 2015/863/EUEN IEC 63000:2018Europe - CE
Food SafetyFood EquipmentNSF/ANSI standard 2United States
Approved for use in Flammable RefrigerantsEnclosed Break Device / sealed device nC (Relays)Sealed Device "nC" IEC 600079-15:2017, Europe Enclosed-Break device "dC" IEC 60079-1:2014, clause 15.5.3US and Canada
Approved for use in Flammable RefrigerantsEnclosed Break Device (Relays)Sealed device "nC" UL 60079-15 and CAN/CSA C22.2 No. 60079-15, Enclosed-Break device "dC" IEC 60079-1:2014, clause 15.5.3US and Canada
Enclosure Material Flammable ClassUL 94, V-0US
HACCP, Temperature Measuring probe in compliance with EN13485 Class I, when used with AKS 12 sensorEN 13485:2001Europe
Certification and Manufacturer Declarations on ConformityCE, CURUS, CQC, UA, EAC, NSF, RoHS

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Models: ERC 21X Series Electronic Refrigeration Control, ERC 21X Series, Electronic Refrigeration Control, Refrigeration Control

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