Carrier 50NF Installation, Operation And Maintenance Instructions

Contents

10Vertical package air conditionnersElectrical heater- Important: with this option, the air flow controller is compulsory.- Electric heater assembly in 1 stage, except for 24 kW to 36 kW withassembly in 2 stages.- For another stages configuration, it is necessary to check if it ispossible and the price.10. OPTIONSBatería de dos filas de agua calienteThe installation of some of these options brings in pressuredrops at air level so it needs to be contemplated in theselection of fans of higher pressure (optional) or in thesubstitution of the standard pulley set with a new set thatcontributes a higher turn speed to the pad.The direction of the water flow must be correct and so the followingindications must be observed:V-220004- Coil filling:• The coil filling must be made with the purger open until water runsthrough it, which is when it is time to close it.• Cut off the water supply and let the bubbles generated go up to thehighest coil point, which is the same as the purger, and eliminateby opening the purger.• Pour more water into the circuit and repeat the previous steps.• Activate the water pump (to be foreseen by the installer) andrepeat the previous steps until no air noises are heard in the ducts,which is when the filling of the installation will have been finishedsuccessfully.- In case of long unit stops, and forcibly if they happen in the winterseason, the coil must be emptied.- Possible water freezing must be avoided: glycolling water or by usinganti-frost thermostat that triggers the circulation pump.In models 120 and 160 the hot water coil assembly is carried out insidethe unit. In the rest of models the assembly is carried out in duct.HOT WATER COILBATTERIE D’APPOINTBATERÍA DE APOYOHOT WATER COILBATTERIE D’APPOINTBATERÍA DE APOYOAccess to the indoorof the frame throughthis lateral panelIn models with two supply outlets (two frames), the electrical heatersare distributed as symmetrically as possible between both frames.Condensation pressure controlThis control is advisable for units that work in cooling with an outdoortemperature below 15º C. In units with centrifugal fan a check isperformed per damper in the fan outlet. A servomotor opens or closesthe damper depending on the proportional signal 0-10V received fromthe electronic control system.Air quality probe (optional)This probe is for installation in the environment or in duct to enablemeasuring CO 2 and/or volatile compounds.This probe is to be connected by the client. The clamps on the terminalboard on the main panel used for the connection are indicated on thewiring diagram provided with the unit.This probe is supplied inside the main electric panel.Air flow control (optional)Differential pressostat that measures the flow variation in the air outlet.This allows the detection of fan belt breakages, since the fan relay onlydetects operating faults that have arisen in the motor.This safety device is compulsory in units with electrical heaters.