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4 Applications

EKE series devices are used where precise control of superheat in air conditioning system is needed. It helps

achieving high energy eciency and reliable operation

EKE serves 2 main applications:

• Controller Mode

◦ Standalone Superheat control

◦ Temperature control

• Driver Mode

The need for cooling can either be dened by the incoming media (S3) or the outgoing media (S4) temperature

4.1 Controller Mode

4.1.1 Superheat control mode

EKE can serve as a PI controller for stepper motor valve that controls the superheat of the evaporator based on a

pressure Pe and temperature (S2) sensors. In superheat mode the controller will control the superheat to be stable

and close to the superheat reference. If superheat is too low the ow in the expansion is decreased and superheat

will be higher

Figure 19: Superheat control application

Danf

oss

80G8222.01

EEV

EKE 1X

4.1.2 Temperature control mode

Temperature control Can be accomplished via a signal from temperature sensor S3 placed in the air ow before the

evaporator or S4 placed in the air ow after the evaporator.

EKE has 2 methods of controlling temperature:

• ON/OFF thermostat

• Modulating thermostat (MTR)

The temperature control can be done using an ON/OFF thermostat that opens/closes the stepper valve as per S3/S4

temperature values or modulating thermostat that regulates the stepper valve more smoothly based on S3/S4

temperature setpoints. The need for cooling can either be dened by the incoming media (S3) or the outgoing

media (S4) temperature

Superheat controller, Type EKE 1A, 1B, 1C, 1D

Danfoss EKE 1C User Manual

Other manuals for Danfoss EKE 1C