CHS_LHS

30366461EN-08 9 LU-VE Group reserves the right to change specifications without prior notification. Water ingress at the customer end of the cable can damage the device. Make sure the end of the cable is connected in a dry environment. Only connect the device to circuits that can be switched off with an all-pole disconnection switch. Be sure to provide grounding; incorrect grounding can cause eletric shock. If the heat exchangers are installed and there is to be an appreciable delay in putting the plant into operation, a temporary electrical supply should be connected to each motor, sufficient to run for at least 4 hours. This procedure should be carried out at least once every 4 weeks, until the heat exchanger is fully operational. It is up to the end user to verify the conditions for protection by automatic disconnection of supply, according to applicable standards. Heat exchangers are designed for TN power systems. Installation of line protection is not supplied by the manufacturer but raccomended according the fan motor type. For correct installation of line protection follow instruction given in the fan manual. The insulation fault protection must be part of power supply of the heat exchanger and is not supplied by the manufacturer. 3.10 Power failure In order to avoid damage to the compressor, the refrigerant supply must be closed in the event of power failure, e.g. by closing the magnetic valve. Safety measures elsewhere in the system will prevent the pressure in the heat exchanger from exceeding the design pressure PS. 3.11 Fan motors The maximum load of the motors and the recommended settings for the overload relays are to be respected. For AC fan motors, the thermal protection (TK) shall be connected to a contactor present in the system, in order to guarantee correct operation of the fan, which increases its power draw especially at low temperature and when heavily frosted. TK protection is recommended instead of circuit breakers as it allows the fans to increase their power draw, guaranteeing reliable operation over time. After a power failure, the motor restarts automatically if the control voltage or a stored speed value is applied (EC motors), or if there is no customer control device preventing such restart (AC motors). Risk of injury: when working on the device, switch off the line voltage and ensure that it cannot be switched back on. Wait until the device comes to a stop. After working on the device, remove any tools or other objects from the device. The electrical control circuit should be arranged with a manual reset device in order to prevent continuous on/off switching (tripping) of the motors. Suppliers and manufacturers of electrical motors provide no guarantee for motors that are combusted through overload. For correct installation and operation of fan speed control systems, follow instructions given in the controller and fan manuals. 3.12 Sound level The sound level values indicated in the documentation are measured under free field conditions. Depending on construction and the materials used for the space in which the heat exchangers are placed, the measured sound pressure value may vary significantly from the documented value. 3.13 Fan ring heaters Under certain conditions, it is possible that during defrost, water vapor originating from the heated coil condenses on the cooler casing, fan blade or fan ring. When the condensate freezes, the fan blade may freeze to the fan ring. In reactivating the installation it is possible that the fan does not function due to the problem mentioned above, which leads to operational malfunction. This is easy to prevent by applying fan ring heating. The heaters are suitable for 230/50/1 electrical supply, and these are suitable for either permanent connection or for linking to the cooler defrost system. These heaters are more than adequate to prevent icing during defrost if the heaters are linked to the cooler defrost system. Î Fan ring heaters must remain operational until the fans are reactivated. 3.14 Defrost general Defrost of air coolers, regardless of the defrost system applied, must have an effect such that after the defrost period all frost has melted and the cooler surface is entirely cleared. When the