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Facilità d'uso
More detailed information can be found in the User Manual. The EC2-311 is a dedicated refrigeration controller with superheat control and a driver for an Alco Controls Electric Control Valve EX2. In addition the EC2-311 controls air temperature and manages defrost and fan(s). Network 1 2 3 4 5 6 7 9 8 Two ECN-Pxx pipe temperature sensors (1) and (2) measure saturated suction gas temperatures at the evaporator inlet and outlet and feed the signals into the superheat control loop. The superheat controller output modulates the opening of the EX2 pulse width modulated Electrical Control Valve (6) thus optimising the refrigerant mass flow through the evaporator. The ECN-Sxx air temperature sensors (3) and (4) measure air-in and air-out temperature of the evaporator and feed signals into the air temperature thermostat. The ECN-Fxx fin sensor (5) is used for defrost termination. The controller has 3 relay outputs to control the compressor (7), defrost heater (9) and evaporator fan (8). Please consult the technical data (right) for input and output ratings. In case of power loss, due to the positive shut-off characteristics of the EX2 Electrical Control Valves, a liquid line solenoid valve is not needed to prevent flooding of the compressor. ! Safety instructions: • Read installation instructions thoroughly. Failure to comply can result in device failure, system damage or personal injury. • The product is intended for use by persons having the appropriate knowledge and skills. • Ensure electrical ratings per technical data are not exceeded. • Disconnect all voltages from system before installation. • Keep temperatures within nominal limits. • Comply with local electrical regulations when wiring Technical Data EC2 Series Controller Power supply 24VAC ±10%; 50/60 Hz; Class II Power consumption 20VA max including EX2. Communication LonWorks® Interface, FTT10, RJ45 connector Plug-in connector size Removable screw terminals wire size 0.14 … 1.5mm2 Temperature storage operating -20 … +65°C 0 … +60°C Humidity 0…80% r.h. non condensing Protection class IP65 (front protection with gasket) Output relays (3) SPDT contacts, AgCdO Inductive (AC15) 250V/2A Resistive (AC1) 250V/8A; 12A total return current Triac output for EX2 Electrical Control Valve Coil (ASC 24V only) 24VAC, 0.1 … 1A Marking Mounting The EC2-311 can be mounted in panels with a 71 x 29 mm cutout. See dimensional drawing below for space requirements including rear connectors. Push controller into panel cutout.(1) Make sure that mounting lugs are flush with outside of controller housing Insert allen key into front panel holes and turn clockwise. Mounting lugs will turn and gradually move towards panel (2) Turn allen key until mounting lug barely touches panel. Then move other mounting lug to the same position (3) Tighten both sides very carefully until controller is secured. Do not over tighten as mounting lugs will break easily. Electrical Installation Refer to the electrical wiring diagram (below) for electrical connections. A copy of this diagram is labeled on the controller. Use connection wires/cables suitable for 90°C operation (EN 60730-1) EC2 analog inputs are for dedicated sensors only and should not be connected to any other devices. Connecting any EC2 inputs to mains voltage will permanently damage the EC2. Important: Keep controller and sensor wiring well separated from mains wiring. Minimum recommended distance 30mm. Warning: Use a class II category transformer for 24VAC power supply (EN 61558). Do not ground the 24VAC lines. We recommend to use one transformer per EC2 controller and to use separate transformers for 3rd party controllers, to avoid possible interference or grounding problems in the power supply. Connecting any EC2 inputs to mains voltage will permanently damage the EC2. EC2-311 Display Case and Coldroom Controller Operating Instructions GB Recommended Sensor Positions in Detail: (1) ECN-Pxx coil-in temperature sensor: Position on the first return bend of the evaporator. (2) ECN-Pxx coil-out temperature sensor: Position directly after the evaporator on the common suction line. (3) ECN-Sxx air-in temperature sensor: Position in the middle of the cabinet as high as possible. (4) ECN-Sxx air-out temperature sensor: Position asymmetric closer to the expansion valve as high as possible. (5) ECN-Fxx fin temperature sensor: Position on the evaporator, asymmetric closer to the expansion valve. Recommendations for mounting both pipe sensors: Insure proper thermal contact by using a metallic pipe clamp or temperature resistant plastic straps. Do not use standard plastic tie wraps (as used for electrical wiring) as they may become loose over time, which could result in faulty temperature measurements and poor superheat control performance. It is recommended to insulate the pipe temperature sensor with ARMAFLEX™ or equivalent. The recommended position of the pipe sensors is between 9 and 3 o’clock as shown in the picture. Both air temperature sens...