Daikin AZQS100B7V1B Installation Manual

Contents

AZQS100~140B7V1B+Y1BSplit system air conditioners4P332194-1B – 2015.01Installation manual1010.1. Preventing foreign objects from enteringPlug the pipe through-holes with putty or insulating material(procured locally) to stop up all gaps, as shown in the figure.1 Putty or insulating material(produced locally)If there is any possibility that small animalsenter the system through the knock-out holes,plug the holes with packing materials (fieldsupplied).Insects or small animals entering the outdoor unit may cause a shortcircuit in the electrical box.Seal knock-out holes to avoid snow and humidity entering.10.2. Precautions when connecting field piping andregarding insulation Be careful not to let the indoor and outdoor piping come intocontact with the compressor terminal cover.If the liquid-side piping insulation might come into contact with it,adjust the height as shown in the figure below. Also, make surethe field piping does not touch the bolts or outer panels of thecompressor. When the outdoor unit is installed above the indoor unit thefollowing can occur:The condensed water on the stop valve can move to the indoorunit. To avoid this, please cover the stop valve with sealingmaterial. If the temperature is higher than 30°C and the humidity is higherthan RH 80%, then the thickness of the sealing materials shouldbe at least 20 mm in order to avoid condensation on the surfaceof the sealing. Be sure to insulate the liquid and gas-side field piping.(The highest temperature that the gas-side piping can reach isaround 120°C, so be sure to use insulating material which isvery resistant.)(See figure 3).1 Compressor2 Indoor and outdoor field piping3 Sealant, etc.4 Insulation materialA Wind heat insulation material around the piping section soit is not exposed and then cover the insulation material withvinyl tape.10.3. Cautions for necessity of a trapTo avoid the risk of oil held inside the riser piping flowing back intothe compressor when stopped and causing liquid compressionphenomenon, or cases of deterioration of oil return, it will benecessary to provide a trap at each difference in height of 10 m in theriser gas piping. Trap installation spacing. (See figure 7)A Outdoor unitB Indoor unitC Gas pipingD Liquid pipingE Oil trapH Install trap at each difference in height of 10 m. A trap is not necessary when the outdoor unit is installed athigher position than the indoor unit.11. Leak test and vacuum dryingWhen all piping work is complete and the outdoor unit is connected tothe indoor unit, it is necessary to: check for any leakages in the refrigerant piping to perform vacuum drying to remove all moisture in therefrigerant piping.If there is a possibility of moisture being present in the refrigerantpiping (for example, rainwater may have entered the piping), firstcarry out the vacuum drying procedure below until all moisture hasbeen removed.11.1. General guidelines All piping inside the unit has been factory tested for leaks. Use a 2-stage vacuum pump with a non-return valve which canevacuate to a gauge pressure of –100.7 kPa (5 Torr absolute,–755 mm Hg). Connect the vacuum pump to both the service port of the gasstop valve and the liquid stop valve to increase efficiency.11.2. Setup(See figure 8)1 Pressure gauge2 Nitrogen3 Refrigerant4 Weighing machine5 Vacuum pump6 Stop valve11.3. Leak testThe leak test must satisfy specification EN378-2.1 Vacuum leak test1.1 Evacuate the system from the liquid and gas piping to–100.7 kPa (5 Torr).1.2 Once reached, turn off the vacuum pump and check thatthe pressure does not rise for at least 1 minute.1.3 Should the pressure rise, the system may either containmoisture (refer to the paragraph "Vacuum drying") or haveleaks.2 Pressure leak test2.1 Break the vacuum by pressurizing with nitrogen gas to aminimum gauge pressure of 0.2 MPa (2 bar).Never set the gauge pressure higher than the maximumoperation pressure of the unit, i.e. 4.0 MPa (40 bar).2.2 Test for leaks by applying a bubble test solution to all pipingconnections.2.3 Discharge all nitrogen gas.NOTICEAny exposed piping may cause condensation.DANGERDo not touch piping and internal parts.1NOTICE Do not purge the air with refrigerants. Use a vacuumpump to evacuate the installation. No additionalrefrigerant is provided for air purging. Make sure that the gas stop valve and liquid stopvalve are firmly closed before performing the leak testor vacuum drying.NOTICEMake sure to use a recommended bubble test solutionfrom your wholesaler.Do not use soap water, which may cause cracking offlare nuts (soap water may contain salt, which absorbsmoisture that will freeze when the piping gets cold),and/or lead to corrosion of flared joints (soap watermay contain ammonia which causes a corrosive effectbetween the brass flare nut and the copper flare).