Daikin FHQ35BVV1B Installation Manual

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Contents

Daikin FHQ35BVV1B Installation Manual Manual pdf 11 page image

English 96. REFRIGERANT PIPING WORK〈For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit.〉〈Execute heat insulation work completely on both sides of the gas piping and the liquid piping.Otherwise, a water leakage can result sometimes.〉(When using a heat pump, the temperature of the gas piping can reach up to approximately 120°C, so useinsulation which is sufficiently resistant.)〈Also, in cases where the temperature and humidity of the refrigerant piping sections might exceed30°C or RH80 %, reinforce the refrigerant insulation. (20 mm or thicker) Condensation may form on thesurface of the insulating material.〉〈Before refrigerant piping work, check which type of refrigerant is used. Proper operation is not pos-sible if the types of refrigerant are not the same.〉CAUTION• Use a pipe cutter and flare suitable for the type of refrigerant.• Apply ester oil or ether oil around the flare section before connecting.• To prevent dust, moisuture or other foreign matter from infiltrating the tube, either pinch the endor cover it with tape.• Do not allow anything other than the designated refrigerant to get mixed into the refrigerantcircuit, such as air, etc. If any refrigerant gas leaks while working on the unit, ventilate the roomthoroughly right away.• The outdoor unit is charged with refrigerant.• Use copper alloy seamless pipes (ISO 1337).• Be sure to use both a spanner and torque wrench together, asshown in the drawing, when connecting or disconnecting pipesto/from the unit. (Refer to Fig. 10)• Refer to “Table 2” for the dimensions of flare nut spaces.• When connecting the flare nut, apply ester oil or ether oil to theinside of the flare section, and spin 3-4 times before screwingin. (Refer to Fig. 11)NOTE• Use the flare nut included with the unit main body.CAUTIONDo not let oil get on the screw holders on the dressing board.Oil can weaken the screw holders.Table 2• Refer to “Table 2” to determine the proper tightening torque.CAUTIONOvertightening may damage the flare and cause a refrigerant leakage.Coat here with ester or ether oil.Torque wrenchFlare nutPiping unionSpannerFig. 10Fig. 11Type of refrigerantApplicable modelFlare dimensions A (mm)R410AFHQPipe size Tightening torqueR0.4-0.8A900±2 0450±2014.2-17.2 N • m32.7-39.9 N • m49.5-60.3 N • m61.8-75.4 N • mφ6.4(1/4”)φ9.5(3/8”)φ12.7(1/2”)φ15.9(5/8”)Flare8.7 – 9.112.8 – 13.216.2 – 16.619.3 – 19.7