Danfoss EET Series User manual

User Guide

Refrigeration controller

Type EETc and EETa series

Enhanced Electronic Thermostat

Contents

Introduction 4

Variants 4

Applications 4

Key features 4

Functions 5

Voltage protection 5

Compressor protection against short cycling 5

Zero Cross Technology 5

Compressor protection against high condensing temperature 6

Advanced Fan control 6

Initial pull down 7

Automatic Pull down (applicable for EETa only) 7

Economy mode 8

Holiday mode (applicable for EETa only) 8

Dual evaporator defrost (applicable for EETa only) 8

Dual compressor control (applicable for EETa only) 8

Anti Freeze function (applicable for EETa only) 9

Quick Test mode 9

Sensor Error handling 9

Potentiometer Error handling 9

Installation 10

Dimensions 10

Connections 11

Mounting 12

Wire routing 13

Accessories 13

KoolKey 13

Mass Programming Key (EKA 201) 13

Bluetooth Adapter (EKA 202 & EKA 203) 14

Product specication 15

Technical specication 15

Parameters 17

EETc 11, 12, 21 and 22 17

Refrigeration controller, type EET series

Assignment 17

Thermostat 17

Compressor 17

Alarm 18

Defrost 18

Fan 19

ECO Management 19

System protection 20

Test Mode 20

Service 20

EETa 2W and EETa 3W 21

Assignment 21

Thermostat 22

Compressor 22

Alarm 22

Defrost 23

Fan 24

Light 24

ECO Strategy 24

Automatic Heater Control 25

System protection 25

Test Mode 26

Service 26

Troubleshooting and Alarms 28

Troubleshooting 28

Alarms 28

Ordering 29

Certicates, declarations, and approvals 30

Online support 31

Refrigeration controller, type EET series

Introduction

The EET Series is the next generation of Electronic Thermostats which is a direct replacement of the Mechanical

Thermostat (and timer) and Danfoss ETC series. It comes in two variants: EETc (Enhanced Electronic Thermostat,

compact) which has one and two output model options for controlling compressor and fan/defrost heater and EETa

(Enhanced Electronic Thermostat, advanced) which has two and three output model options for controlling

compressor, fan, defrost heater or light. With the EETc and the EETa, we continue building on the electronication

legacy by bringing a high number of new features and capabilities to increase performance and exibility, while

keeping the familiar form factor and installation method.

Variants

EET Compact (EETc):

• EETc 11: 1 output, 120 V

• EETc 12: 1 output, 230 V

• EETc 21: 2 outputs, 120 V

• EETc 22: 2 outputs, 230 V

EET Advanced (EETa):

• EETa 2W: 2 outputs, wide voltage (100 – 240 V)

• EETa 3W: 3 outputs, wide voltage (100 – 240 V)

Applications

• Glass door merchandisers

• Beverage coolers

• Commercial freezers and refrigerators

• Preparation tables, under counters

• Dual compressor refrigerators (EETa only)

• Anti-freeze applications requiring auto heat control (EETa only)

• Applications requiring dual defrost control (EETa only)

Key features

Table 1: Key features

Key features

EETc

EETa

Common interface for easy transition from ETC series and Mechanical Thermostat

Yes

Moisture protected design for cold space installation

Yes

Zero cross technology for longer relay life

Yes

Compressor protection from voltage uctuations.

Yes

Compressor protection from condenser overheat

Yes

Advanced fan control

Yes

Economy mode (Eco mode) for energy saving

Yes

Initial pull down for faster cooling at power up.

Yes

Test mode for quick checking of output function

Yes

Emergency mode in case of sensor and potentiometer failure

Yes

Parameter programmable at production site with direct programming key access

Yes

Refrigerant leakage detection

Yes

Wide Voltage Power supply

Yes

Holiday mode for energy saving

Yes

Dual evaporator defrost

Yes

Dual compressor control

Yes

Automatic Pull down for faster cooling

Yes

Anti-freeze function for low ambient conditions

Yes

Onsite rmware update capability

Yes

Refrigeration controller, type EET series

uHi

uLi

uLo

Danfoss

80G408

uHi

uLo

uLi

Maximum voltage limit above which the

compressor is switched o

Supply voltage

Minimum voltage limit below which the

compressor is switched o

Minimum voltage limit above which the

compressor can start

Functions

Voltage protection

The voltage protection feature protects the compressor against high and low voltage uctuations by limiting the

compressor operation within specied voltage limits. Whenever the supply voltage goes beyond the dened

voltage limits set in the controller, it will switch the compressor OFF, and resume the operation when the voltage

falls under the operating range.

Figure 1: Voltage protection

Compressor protection against short cycling

This feature protects the compressor from short ON-OFF cycles. The EET controller ensures that the compressor is

switched ON and OFF for a minimum time specied under Minimum run time (Crt) and Minimum stop time (cSt)

except during voltage and condenser protection.

Figure 2: Compressor protection against short cycling

Danfoss

80G409

min. run time

OFF

CUT-IN

CUT-OFF

min. stop time

time

Temperature Power to compressor

time

Zero Cross Technology

The Zero Cross Technology controls the relay’s switching time by ensuring that the relays switch ON or OFF close to

the 0th position of the voltage curve. This ensures reduced relay contact welding, increased relay life and reduced

switching noise. This feature should only be used when the compressor is directly driven by the EET relay and no

external contactor is used.

Refrigeration controller, type EET series

0.8

0.6

0.4

0.2

-0.2

-0.4

-0.6

-0.8

-1

0 90 180 270 360 90 180

Danfoss

80G422

Break on negative edge

Break on positive edge

Figure 3: Zero Cross Technology

Compressor protection against high condensing temperature

If the condenser is blocked due to dirt / dust and the condenser is unable to cool down the refrigerant properly due

to lack of proper heat exchange, it will aect its performance and greatly reduces system life. This feature will

protect the system and compressor via a two-step protection mechanism. The controller can be congured to set an

early warning temperature by the user, when the compressor can keep running, and then a second level of

condenser temperature beyond which the compressor is switched o until the temperature comes down to an

acceptable limit. This would help to improve the compressor life by running within the allowed operating envelope

of the compressor.

Figure 4: Compressor protection against high condensing temperature

Danfoss

80G410

Condenser Temperature

Compressor

Cond alarm

Cond alarm (cAL)

Block Limit (cBL)

OK Limit (coL)

Advanced Fan control

Advanced Fan control helps maintain a uniform cooling by switching fan ON and OFF during the compressor OFF

cycle. This feature reduces the overall energy consumption while maintaining a uniform temperature in the cabinet.

Refrigeration controller, type EET series

Figure 5: Advanced Fan control

Danfoss

80G411

Compressor cut in

Compressor cut out

Fan

Compressor

Fan ON cycle

Fan stop cycle

Fan start delay Fan stop delay

Cabinet Air

Initial pull down

If the cabinet temperature is very high at power up, the controller detects the need for faster cooling and enters into

Initial pull down mode. In this mode, the controller adjusts the defrost interval by skipping it to a later time than its

scheduled intervals until the desired cabinet temperature is achieved.

Figure 6: Initial pull down

∆ t

Cut-in

Cut-out

0 ºC

Danfoss

80G412

Without initial pull down, where defrost is initiated

With initial pull down

Initial pull down initiation (Pit)

Defrost terminate temp

Time saving, with ‘Initial pull down’

feature enabled

This ensures faster cooling by achieving the required cabinet temperature in the shortest period possible.

Automatic Pull down (applicable for EETa only)

This feature helps to achieve faster and extra cooling when there is an increase in the cabinet temperature due to

frequent door opening or fresh food products being placed in the cabinet. The faster and extra cooling is achieved

by adjusting the temperature set point and defrost intervals until the desired setpoint range is achieved. The

controller detects this mode by monitoring the cabinet temperature behaviour, also it is possible to trigger this

mode manually via a digital input switch.

Figure 7: Pull down/Super cool mode

Danfoss

80G423

> 1 hr Pdd

(pull down duration)

Pull Down Initiation (Pit)

Pull down offset temp (Pit)

Cut-in

Cut-out

Set point

(pull down initiated, when the cabinet

temp is above pit for for more than 1 hr)

Refrigeration controller, type EET series

Economy mode

This feature helps save energy by increasing the setpoint when the normal cooling demand is not required. ECO

mode is triggered when the door is closed for more than the time specied by the parameter ‘Edd’. ECO mode can

also be triggered manually via Di input. In some cases, this feature is meant to decrease the setpoint and thereby

enabling extra cooling when the power is cheaper at night time.

Figure 8: Eco mode

Danfoss

80G413

Door Open

Door Close

Temperature

Normal mode

Eco delay

(Edd)

Eto

ECO mode Normal mode

Time

Holiday mode (applicable for EETa only)

This feature allows for more energy savings during vacation/ Holiday period by o-setting the setpoint when there

is no usage for a prolonged period. If there is no door activity detected after entering ECO mode for the period that

has been congured under parameter “Holiday length”, it enters into Holiday mode. The entry into Holiday mode

happens by time passing by and is exited by door action. Holiday mode can also be triggered manually via digital

input.

Figure 9: Holiday mode

Danfoss

80G414

Door Open

Door Close

Temperature

Normal mode

Eco delay

(Edd)

Holiday Length

(HoL)

Eto

Hto

Normal modeECO mode Holiday mode

Time

Dual evaporator defrost (applicable for EETa only)

The EETa can control refrigeration cabinets with two defrost heaters and two evaporator sensors in combination.

This feature provides more exibility to the refrigeration system design and provides the most ecient defrost

handling. The controller can control defrost with both a single heater and two evaporator sensor inputs as well as

two heaters with two evaporator sensor inputs.

Dual compressor control (applicable for EETa only)

Certain refrigeration systems need more than one refrigeration circuit to handle the cooling requirements of the

cabinet while meeting other statutory requirements (for ex: Flammable Refrigerant qty). The EETa controller comes

with a feature that can handle two compressors which can be operated with time delay (Scd).

NOTE:

The second compressor can be congured to any of the auxiliary relays and might require an external relay, if the

rated current of the second compressor is more than the auxiliary relay ratings.

Refrigeration controller, type EET series

Figure 10: Dual compressor support

ON Cycle OFF Cycle

OFF

Compressor 1

Compressor 2

Scd

Danfoss

80G444

Anti Freeze function (applicable for EETa only)

This feature protects the bottle coolers from freezing, if they are installed outdoor with low ambient temperature.

The controller automatically switches between cooling and heating mode if the cabinet air temperature goes below

the allowed limit, thus preventing the freezing of stored products. This feature can be activated only when the

defrost type used is electrical.

Figure 11: Automatic heater control for Anti Freezing applications

Danfoss

80G421

Energy mode delay Energy mode delay

Increase in ambient

temperature

Drop in ambient

temperature

Cooling

mode

Heating

mode

Quick Test mode

This feature helps test all the outputs of the controller instantly when connected to an actual application in the OEM

Production line or during eld service. The feature can be used when connected to KoolProg or by using MODBUS

commands (please contact the Danfoss support team for info about MODBUS commands).

Sensor Error handling

In the event of cabinet sensor error/ failure, cabinet temperature can be controlled in EET controller using two

methods to avoid food spoilage until the failed sensor is replaced.

Manual Error handling: Run the compressor for xed ON and OFF time by dening error run time and error stop

time.

Auto Error handling: Smart self-learning feature of EET controller, controls the compressor cycle based on past

compressor cycles.

Potentiometer Error handling

Potentiometer error handling automatically sets the cabinet temperature to smart default setting to avoid food

spoilage in the event of a potentiometer failure.

Refrigeration controller, type EET series

Installation

Dimensions

Figure 12: EETc

7.8

5.95

3.95±0.05

1.5

M10 x 0.75

Danfoss

80G400

79 mm

37.5 mm

48 mm

30.517.5

Figure 13: EETa

7.8

5.95

1.5

3.95±0.05

M10 x 0.75

83.5 mm

43.5 mm 48 mm

30.517.5

Danfoss

80G401

M10 x 0.75 is supplied loose.

Figure 14: Mounting plate dimensionfor EETc and EETa

Danfoss

80G402

16 mm

Recommended Mounting Plate Hole Center

Refrigeration controller, type EET series

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