Carrier 42NQV025H Service Manual

Contents

– 55 –10-2-3. Installation/Servicing ToolsChanges in the product and componentsIn the case of an air conditioner using R410A, in order to prevent any other refrigerant from being chargedaccidentally, the service port diameter of the outdoor unit control valve (3 way valve) has been changed.(1/2 UNF 20 threads per inch)• In order to increase the pressure resisting strength of the refrigerant piping flare processing diameter and sizeof opposite side of flare nuts has been changed. (for copper pipes with nominal dimensions 1/2 and 5/8)New tools for R410ANew tools for R410AGauge manifoldCharge hoseElectronic balancefor refrigerant chargingTorque wrench(nominal diam. 1/2, 5/8)Flare tool (clutch type)Gauge for projectionadjustmentVacuum pump adapterGas leakage detectorApplicable to R22 model××¡×¡— —¡×ChangesAs pressure is high, it is impossible to measure by means ofconventional gauge. In order to prevent any other refrigerant frombeing charged, each port diameter has been changed.In order to increase pressure resisting strength, hose materialsand port size have been changed (to 1/2 UNF 20 threads per inch).When purchasing a charge hose, be sure to confirm the port size.As pressure is high and gasification speed is fast, it is difficult toread the indicated value by means of charging cylinder, as airbubbles occur.The size of opposite sides of flare nuts have been increased.Incidentally,a common wrench is used for nominal diameters 1/4 and 3/8.By increasing the clamp bar’s receiving hole, strength of spring inthe tool has been improved.Used when flare is made by using conventional flare tool.Connected to conventional vacuum pump. It is necessary to usean adapter to prevent vacuum pump oil from flowing back to thecharge hose. The charge hose connecting part has two ports-onefor conventional refrigerant (7/16 UNF 20 threads per inch) andone for R410A. If the vacuum pump oil (mineral) mixes with R410Aa sludge may occur and damage the equipment.Exclusive for HFC refrigerant.• Incidentally, the “refrigerant cylinder” comes with the refrigerant designation (R410A) and protector coating in theU. S’s ARI specified rose color (ARI color code: PMS 507).• Also, the “charge port and packing for refrigerant cylinder” require 1/2 UNF 20 threads per inch corresponding tothe charge hose’s port size.FILE NO. SVM-07013