Daikin FTS20JEV1K Installation Manual

Contents

10Refrigerant PipingOutdoor Unit 3 ways valveAllen keyService PortFlare nutHIGH PRESSURE GAUGEGAUGE MANIFOLDLOW PRESSURE GAUGEHANDLE HI (ALWAYS CLOSED)CHARGE HOSE-760mmHgHANDLE LOCHARGE HOSE VACUUM PUMPADAPTER FORCOUNTER FLOWPREVENTIONCHECKVALVELIQUIDVALVEHIGH PRESSURE GAUGELOW PRESSURE GAUGEGAUGE MANIFOLD-760mmHgHANDLE LO HANDLE HI (ALWAYS CLOSED)CHARGE HOSECHARGE HOSECHECKVALVELIQUIDVALVEGAS VALVE(3-WAY)CONFIGURATION OF AIRPURGE BY CHARGINGGAS VALVE(3-WAY)CONFIGURATION OF AIRPURGE BY CHARGINGSPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNITR410A is a new HFC refrigerant which does not damage theozone layer. The working pressure of this new refrigerant is1.6 times higher than conventional refrigerant (R22), thusproper installation/servicing is essential.• Never use refrigerant other than R410A in an air conditionerwhich is designed to operate with R410A.• POE or PVE oil is used as lubricant for R410A compressor,which is different from the mineral oil used for R22compressor. During installation or servicing, extra precautionmust be taken not to expose the R410A system too longto moist air. Residual POE or PVE oil in the piping andcomponents can absorb moisture from the air.• To prevent mischarging, the diameter of the service port onthe flare valve is different from that of R22.• Use tools and materials exclusively for refrigerant R410A.Tools exclusively for R410A are manifold valve, charginghose, pressure gauge, gas leak detector, flare tools, torquewrench, vacuum pump and refrigerant cylinder.• As an R410A air conditioner incurs higher pressure thanR22 units, it is essential to choose the copper pipes correctly.Never use copper pipes thinner than 0.8mm even thoughthey are available in the market.• If the refrigerant gas leakage occurs during installation/servicing, be sure to ventilate fully. If the refrigerant gascomes into contact with fire, a poisonous gas may occur.• When installing or removing an air conditioner, do not allowair or moisture to remain in the refrigerant cycle.VACUUMING AND CHARGINGVacuuming is necessary to eliminate all moisture and air from the system. The series II Outdoor Unit is provided with flarevalve fittings.Vacuuming The Piping And The Indoor UnitExcept for the outdoor unit which is pre-charged withrefrigerant, the indoor unit and the refrigerant connectionpipes must be air-purged because the air containing moisturethat remains in the refrigerant cycle may cause malfunctionof the compressor.• Remove the caps from the valve and the service port.• Connect the center of the charging gauge to the vacuumpump.• Connect the charging gauge to the service port of the 3-wayvalve.• Start the vacuum pump. Evacuate for approximately 30minutes. The evacuation time varies with different vacuumpump capacity. Confirm that the charging gauge needle hasmoved towards -760mmHg.Caution• If the gauge needle does not move to -760mmHg, be sure tocheck for gas leaks (using the refrigerant detector) at flaretype connection of the indoor and outdoor unit and repairthe leak before proceeding to the next step.• Close the valve of the changing gauge and stop the vacuumpump.• On the outdoor unit, open the suction valve (3 way) andliquid valve (2 way) (in anti-clockwise direction) with 4mmkey for hexagon sacked screw.Charge OperationThis operation must be done by using a gas cylinder and aprecise weighing machine. The additional charge is topped-upinto the outdoor unit using the suction valve via the serviceport.• Remove the service port cap.• Connect the low pressure side of the charging gauge to thesuction service port center of the cylinder tank and closethe high pressure side of the gauge. Purge the air from theservice hose.• Start the air conditioner unit.• Open the gas cylinder and low pressure charging valve.• When the required refrigerant quantity is pumped intothe unit, close the low pressure side and the gas cylindervalve.• Disconnect the service hose from service port. Put back theservice port cap.