Danfoss EETc 11, EETc 12, EETc 21, EETc 22, EETa 2W Data sheet

Data sheet

Refrigeration controller

EETc 11, 12, 21, 22 and EETa 2W, 3W

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 electronification legacy by bringing a
high number of new features and capabilities
to increase performance and flexibility, while
keeping the familiar form factor and installation
method.

Features • Moisture protected design for installability

inside the cold space area

• Similar dimensions and installation method
as ETC series and Mech Thermostat for easy
transition (applicable for EETc)

• Wide Voltage Power Support (110 – 230 V)
(applicable for EETa)

• Configurable auxiliary inputs and outputs to
control fan, defrost heater and light

• Alarms, fan & light control, compressor
management using door sensor

• Supports multiple sensor types: NTC 5K, NTC
10K, PTC 990

• Zero cross technology for longer relay life

• Mass programmable at production site with
direct programming key access

• Compressor protection from voltage
fluctuations, spikes and surges

• Advanced fan control

• Multiple defrost methods to choose from

• Condenser overheat protection

• Economy mode (Eco mode) to give more
energy saving potential during night and long
hours of no use. EETa also supports Holiday
mode, which allows longer than a day period
of auto temperature offset

• Dual defrost control (only EETa)

• Quick factory test mode to check if inputs/
outputs are functioning

• High and low temperature alarm indication

• Safety/Emergency mode in case of sensor and
potentiometer failure

© Danfoss | DCS (vt) | 2020.10

AI355927147717en-000102

Data sheet | Refrigeration controller, EETc 11, 12, 21, 22 and EETa 2W, 3W

Applications

Variants

Facts

Applications supported by the EETc:

• Glass door merchandisers

• Beverage coolers

• Commercial freezers and refrigerators

• Preparation tables

Applications supported by the EETa:

• Glass door merchandisers

• Commercial freezers and refrigerators

• Preparation tables

• Dual compressor refrigerators

• Anti-freeze applications requiring auto heat
control

• Applications requiring dual defrost control

EETc:

• EETc 11: 1 output, 120 V

• EETc 12: 1 output, 230 V

EETa:

• EETa 2W: 2 outputs, wide voltage (120 – 230 V)

• EETa 3W: 3 outputs, wide voltage (120 – 230 V)

• EETc 21: 2 outputs, 120 V

• EETc 22: 2 outputs, 230 V

Variant differences

HW differences between EETc and EETa:

Features EETc EE Ta

Sensor inputs 2

Wide voltage power module No

Visible LED indication Power

Temperature sensors supported NTC 5K, NTC 10K

Output options 1 & 2 Relay

3

Yes

Power, Error

NTC 5K, NTC 10K, PTC

2 & 3 Relay

SW differences between EETc and EETa:

Features EE Tc EE Ta

Onsite Parameter Programming/
Production Programming capability

Onsite firmware update capability No

Eco mode Yes

Holiday mode No

Light Control No

Dual defrost No

Dual compressor control No

Anti-freeze function No

Koolkey with external power

Koolkey with powered controller

Yes

Yes

Yes

Yes

Yes

Yes

Yes

2 | AI354138789910en-000101

© Danfoss | DCS (vt) | 2020.10