Carrier 42N_S Installation And Operation Manual

Also see for 42N E Series: Installation and operation manual Installation and operation manual

Carrier 42N_S Installation And Operation Manual Manual pdf 24 page image

24 42N_S 42N_EEnglish Water connectionsWater piping can enter either from the floor or from the wall. Leavethe space shown in the figure 21-22. The unit coil can be supplied withwater connections positioned as requested. However field conversion ofthe connections is achieved quite simply as follows:t Remove the control box panel;t Unscrew the 6 self-threading screws and remove the front drain pan;t Unscrew the two screws holding the heat exchanger to the structure,necessary for earthing the coil;t Remove the coil by unhooking it with the rubber tabs and turn ithorizontally through 180°;t Place the coil into its new position by hooking it using the specialrubber tabs;t Refit the front drain pan with the 6 self-threading screws;t Retighten the two screws holding the heat exchanger to the structure,necessary for earthing the coil (Fig. 23, rif. 8);t Position the control box panel opposite the coil connections;t Place the temperature sensor into its seat and seal with filler (see fig.23 - rif. 7);t Position the control into the tabs provided,, blocking it with thesupplied metal plate (see paragraph “Controls”);t Change the position of the condensate drain closing plug of the drainpan and put it on the same side of water connections.NOTE: The connection pipes must be insulated with a condensation-proof material such as polyurethane, propylene or neoprene of 5 to 10mm thickness.NOTE 1: On units with valves already installed, reversal of the coil can bemade by ordering the corresponding valve kit.Automatic water valves(See fig. 25-26)The fan coils can be equipped with valves, both in 2-pipe or 4-pipeversions. We recommend using the valves in order to preventcondensate formation on the unit when the fan is not working androom humidity is very high.The valve heads are thermal type with 230V power supply, averageconsumption 2,5 VA, maximum operating pressure 1400 kPa.Opening time depends on the temperature and is from 120 to 240seconds. The tightness of the connections is ensured by a rubber sealing(O-RING) inserted in the connection (tightening torque 30 Nm).If valves are installed by the installer (accessories), do not forget to usethe (O-RING) sealing ring supplied.The motorized valves can be 3-way with bypass or 2-way. Make sure thatall unit pipe connections are aligned and well supported, to preventabnormal strains on the unit. Check for leaks after the system has beenfilled with water. Once water connections are completed, check fortightness, use nylon strips to close the shell and insulate the valveand make sure that all cold parts are properly insulated (fig. 25-26). For2-way valve units, close the free space of the insulating shell using theplug supplied (fog. 26c). Fix the insulating shell using nylon strips (fig.26a). Make sure the pipe insulation is correctly positioned inside theshell (fig. 26a) to prevent condensate on the pipes. The manufacturercannot guarantee seal quality and tightness of the valve group providedby the installer (which is therefore not factory tested). The manufacturerthus declines all responsibility for possible malfunction of said items andfor damage resulting from leaks in said items.WARNING: After the electric control panel has placed on the oppositeside, connect the ground to the unit’s frame (see fig. 23, - rif. 8).Electrical connectionsInstall the unit according to the national standards on plants.Connect L (LINE) ,N (NEUTRAL) e (EARTH) power supply as shown infig. 27-28-29-30.The fuses on the mains, as shown in the wiring diagrams, are thosementioned in table II. These fuses shall be supplied by installer.IMPORTANT:t .BLFFBSUIDPOOFDUJPOQSJPSUPBOZPUIFSFMFDUSJDBMDPOOFDUJPOTt %JTDPOOFDUUIFQPXFSTVQQMZUPBMMDJSDVJUTQSJPSUPIBOEMJOHBOZelectrical components.t Remove the control box panel casing by means of the fixing screw/s.t According to the installation instructions, the disconnecting switchesfrom the mains power supply should have a contact gap (4 mm)such that total disconnection can be ensured under the conditionsprovided for by overvoltage class III.t All fan coil connecting cables as well as accessory wires must be ofthe H05 VV-F, type with PVC insulation according to the EN 60335-2-40 standard.t The cables used to connect power supply should be of the samesection indicated in table II.t Use the special cover and the screw or screws previously removed toclose the control box panel after electrical connections are completed.CONTROL BOX PANEL: The control box panel is always positionedopposite the water connections.Terminal boxes for connections are contained into the control boxpanels. (see fig. 27-28-29-30).