Carrier 50VZ Installation, Operation And Maintenance Instructions

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Carrier 50VZ Installation, Operation And Maintenance Instructions Manual pdf 32 page image

32Table 7 - Heat pump operationZone Air temperatureDry bulb Wet bulbIndoorMaximum 27°C -OutdoorMaximum 24°C 18°CMinimum -15°C -OPTIONS AND ACCESSORIESOption AccessoryHead pressure control kit x xElectric heating x xCompressor crankcase heater (standard on 50PZ) x xHot water coil x xEconomizer xOutdoor air filter x xUser interface xProtection grille x xMinimum opening potentiometer x xVolt-free contacts xOptional communications x xReturn air sensor x xSuperior drive x38VZ/PZ for vertical discharge xHot water heating coilThis option/accessory consists of the water heating coil, the airflow equalising plate, the side access panel and fixingcomponents.The heating coil performances are in accordance with Euroventconditions and are shown in tables 8 and 9.Table 8Unit 015 025 030 031 040 045 055 065 075Heating capacity kW* 9.6 17.5 19.6 19.6 27.3 33.4 35.3 41 43.8Water flow l/s 0.46 0.84 0.94 0.94 1.31 1.60 1.69 1.96 2.09Pressure drop kPa 13 20 14.5 14.5 13.5 21 23 33.5 37.5* Indoor air temperature 20°C and entering/leaving water temperature 50°C/45°C.Table 9Unit 015 025 030 031 040 045 055 065 075Heating capacity kW* 15.2 27.9 30.4 30.4 43.4 51.5 54.6 63.9 68.5Water flow l/s 0.36 0.67 0.72 0.72 1.04 1.23 1.31 1.52 1.64Pressure drop kPa 9 13 9 9 9 13 14.5 21 24* Indoor air temperature 20°C and entering/leaving water temperature 70°C/60°C.Water connectionThe entering and leaving water connections are all threadedmale gas connections with the diameters shown in Table 10.Table 10Unit 015 025 030 031 040 045 055 065 075Ø connection 1” 1” 1-1/4” 1-1/4” 1-1/4” 1-1/2” 1-1/2” 1-1/2” 1-1/2”- Remove the gas from the refrigerant circuit using recoveryequipment to avoid harming the atmosphere.- Electrically disconnect the compressor.- Unbraze or unscrew the suction and discharge lines,taking care not to damage the rest of the components.- Remove the fastenings from the compressor.- Replace the compressor, ensuring that it containssufficient oil.- Braze or screw in the lines.- Connect the compressor according to the wiring diagram.- Evacuate the compressor.- Fill in the refrigerant charge indicated on the nameplate,plus the required charge for the refrigerant connectionlines, if the system is a split system.NOTE: This operation must be done by a qualified technician.Description of unit protection devicesThe unit includes the following unit protection devices:- Internal compressor protector to avoid overheating.- Short-cycle protection (included in the main electronicboard).- Outdoor fan motor thermomagnetic switch.- Indoor fan motor thermomagnetic switch.- High pressurestat - This protects the unit againstexcessive condensing pressure. The high pressurestat hasfactory-fixed non-adjustable settings. To check, seesection Initial checks.- Low pressurestat - This protects the unit againstexcessive low pressure in the evaporator. The lowpressurestat has factory fixed non-adjustable settings. Tocheck, see section Initial checks.CAUTION: When any of these cuts out, the unit stops and willnot re-start until the contacts have been reclosed afterrectification of the fault.Table 5 - Pressure switch settingsCut-out Cut-in ResetHigh pressurestat *2844 kPa 1863 kPa AutomaticLow pressurestat *265 kPa 363 kPa Automatic* Factory-fittedWARNING: Alteration of factory settings other than the designset-point, without manufacturer's authorisation, may void thewarranty.Operating limitsThese units have been designed to operate within the followinglimits:Table 6 - Cooling operationZone Air temperatureDry bulb Wet bulbIndoorMaximum 35°C 21°CMinimum 19°C 14°COutdoorMaximum 46°C -Minimum 19°C* -* With the optional head pressure control, the unit can operate with temperatures below 19°C.