RA-CTA, Controller with active frost protection for 3-point actuator
RA-CTA, Controller with active frost protection for 3-point actuator
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RA-CTA Controller with active frost protection for 3-point actuator

Controller intended for control of valve actuators in water-heated systems. It has a built-in room sensor and can be used for control of supply air temperature or room temperature, with or without cascade control. The controller has built-in active frost protection with two alarm relays and automatic heat maintaining function during shutdown.

Specifications

Specifications

Specifications for RA-CTA
Power Supply 24VAC (22...26 V AC 50/60Hz / ), VA
Dimensions, external (WxHxD) 93x153x40 mm
Control signal (output) 3-point floating control, 24V AC output (heating)
Sensor inputs Three 0...30°C (Sensor determines the range (NTC sensor))
Setpoint 0...30°C
Minimum limit 0...30°C
Frost alarm setpoint 5 °C
Shutdown mode setpoint 25°C
Fan relay Breaking contact for fan contactor interlock if a frost protection alarm occurs, 230V AC. 3A
Alarm relay Change-over contact for alarm indication if a frost protection alarm occurs, 24VAC, 2A
Specifications for Controller with active frost protection for 3-point actuator
Protection class IP20
Ambient humidity (non-condensing) 0…90 % RH
Storage temperature -40…50 °C
Mounting Wall
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