ECKELMANN UA 300 D - On−Off Control by Room Air Sensor

Function of UA 300 D
12
Version 2.03 27. Juni 2008
3.2.2.9 On−off control by room air sensor
Controller type: UR 141
Plain on−off control: Cooling is controlled by the coldroom air temperature sensor. The cooling relay is de−energi-
zed when temperature reaches the setpoint (switch−off value) on the room air sensor and is restarted with adju-
stable hysteresis.
Single−zone operation (LT rooms):
Valve 1
Room
air
R4.1
Supply
air
Verdampfer 1
Evaporator 1
UA 300 D
ZNR. 51203 72 430 E0
Refrigeration point
controller
R4.1: Room air sensor (Terminal Z21/22)
Ventil 1: Solenoid Valve 1 relay (Terminal 25/26/28)
Two−zone operation (Zone 1: LT rooms / Zone 2: NT rooms):
Valve 1
Room
air
R4.1
Room
air
Valve 2
R4.3
Supply
air
Supply
air
Verdampfer 1
Evaporator 1
Verdampfer 2
Evaporator 2
UA 300 D
ZNR. 51203 72 330 E1
Refrigeration point
controller
R4.1: Room air sensor (Terminal Z21/22)
R4.3: Room air sensor (Terminal Z71/72)
Valve 1: Solenoid Valve 1 relay (Terminal 25/26/28)
Valve 2: Solenoid Valve 2 relay (Terminal 35/36/38)