Carrier 50NF Installation, Operation And Maintenance Instructions

Contents

8Vertical package air conditionnersThe air outlet and return ducts must be calculated in accordance withthe rated flow and the unit’s available pressure(refer to the technicalcharacteristics table). The duct calculation and design must be madeby qualified technical personnel.It is advisable to take into consideration the following recommendations:- Bends in the fan discharge outlet must be avoided. It is recommendableto have a straight section of duct measuring approximately 1 metre. Ifit is not possible, they must be as smooth as possible, using indoordeflectors when the duct is of large dimensions.- When making the ducts, direction sharp changes must be avoidedsince they can generate occasional pressure drops, which affectthe available pressure and the flow. The location of dischargeand aspiration grilles must be studied carefully to avoid the airrecirculation and the transmission and generation of noises to theinterior.- Flexible connections must be made between the ducts and the unitthat avoid the noise and vibration transmission.- No matter the type of ducts type to use, they must not be composedof materials that propagate fire nor expel toxic gases in the event of afire. The internal surfaces must be smooth and should not pollute theair that circulates within them. In any case, the effective legislationabout this issue must be respected.Caution: These units are designed to connect to a ductnetwork. If the indoor circuit outlet fan is accessible froma particular point in the duct network, the installer mustfit a protection mesh in the discharge as per the currentregulation.Air ducts connections- Before commissioning, check the blade rotation direction and thatthe axis turns without strokes nor vibrations- Once running, check the operation conditions: pressures, flows andconsumptions.- The coupling of characteristic bends of the fan and the room isvery important, so that the flows and pressures provided to the ductnetwork are as required.Checks at fansPulley and belt adjustmentBoth for the indoor circuit motorfans as well as the outdoor circuit arecoupled by pulleys and belts. In this type of fans, the following mustbe taken into considerations:- The pulleys must be on the same plane, so it is important to checkthem with the help of a ruler or a laser aligner.- In case they are not aligned, remove the pulley screws, remove thepulley and, after removing the hub pin, it can be slided over the axle(this action can be performed both in the motor as well as in the fan).- After fixing the pulleys on the same plane, the belt tension is madeby tightening the tensor screw.- The belt tension must be checked after 24 hours of motor operation.Attention: Before performing these operations, it is necessary to verifythat the unit is disconnected from mains.Pulleys must stay on the same planeTensorscrewPulleyscrewsTaper pinCondensate drain connectionCONNECT SIPHONMETTRE SIPHONPONER SIFONV220014All models are provided of two condensates drain pans, one in theinternal circuit and other in the external circuit,with independent drainages. Drainage pipe, inbronze, gas thread M3/4”.Installation norms- Check that the condensates outlet is not obstructed.- All water drain pipes should be provided with a siphon to avoid badodours and water overflows.