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

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

Ordering 34

Sensors 34

Certicates, declarations, and approvals 35

Online support 36

Electronic refrigeration control, type ERC 21X

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.

Electronic refrigeration control, type ERC 21X

Figure 1: ERC 211

Sair

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

DI1

DI2

DO2

DO3

DO1

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

Figure 3: ERC 214

Sair

DI1

DI2

DO4

DO2

DO3

DO1

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

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

OFF

CUT-IN

CUT-OFF

min stop 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

Figure 6: Compressor protection against high condensing

temperature

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.

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.

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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