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Technical Information
3
Introduction
The ECB-D20 controller is designed for display cabinets with scroll compressors and heat recovery by air or
water. The cabinet control system can be used for evaporator control purposes using an electronic unipolar
stepper motor valve or a thermostatic valve in conjunction with a solenoid valve. When operating multiple
refrigeration units, the automatic defrost synchronization function can be handled using a hardware link or an
external monitoring system. The condensing pressure and/or temperature can be controlled using a three-
way valve in case of water cooling or a fan control system in case of air cooling. The controller is equipped
with a day/night program so that different setpoint values can be entered. A control function for lighting and
night blinds is also integrated.
Figure 1 Refrigeration cycle
Water connection couplings
Water-cooled
condenser
Filter dryer
Collector
MV
Sight glass
Compress
or
Or EXV with
stepper motor
TXV
Defrost heater
Evaporator
p<
p>
T
P
T
P
