York MHC-MHH Installation Manual
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HIGH WALL 11- Evacuate the piping. This operation, which should lastat least 15 minutes if there are large piping lengths andchanges in elevation, should be followed by a leak test.To this effect, when the piping has been evacuated,close the pressure gauge tap, note the value on thegauge, then wait for 15 minutes. If the needle moves,there is a leak in the system. Make the necessaryadjustments or repairs and repeat this procedure untilthe needle no longer moves.- Open the service valves and top up the refrigerantcharge if necessary.This unit is shipped complete with a charge of R22 refrigerantthat will be sufficient for an interconnecting piping length of5 meters.InstallationMinimum thickness 6 mmLow pressureGas valveLiquid valvePressure tapOUTDOOR UNIT Fixing and Piping• Piping must be performed by qualified personnelaccording to good refrigeration systems practices.• Piping materials and insulation materials must be ofrefrigerant quality.• Select the pipe diameters according to the size of unitand cut the pipe to design length by using pipe cutter.• Install the flare nuts and flare the end of the pipes.• Check that no foreign bodies are inside the piping.• Align the central of the connecting pipes and tightenthe flare nut.• Fix piping with pipe clamps and check that any pipevibrations cannot be transmitted to the buildingstructure.Notes• Connect the pipe correctly.• Do not apply the excessive torque.• Use an appropriate bending tool to form curves andavoid over-tightening the refrigerant tubes.• To prevent heat loss, the two lines must be insulatedseparately. Maximum piping lengthsNote : Where the difference in elevation between the indoorunit and the outdoor unit is greater than 5 meters,install an oil trap every 5 meters.The suction line must have a 2% gradient up to thecompressor on horizontal sections.Where piping lengths are unusually long and include alarge number of oil traps, it may be necessary to adjustto compressor charge.Refrigerant charge to be added per extrametre of piping length when more than 7.5meters. Refrigerant piping connections(FLARE connections)To avoid alteration of unit capacities, check that pipinglengths and changes in elevation are kept to a strictminimum.Before connectiong the refrigerant lines, follow theprocedures below (if pre-charged connection lines arenot supplied):- Select copper pipe diameters according to the size ofunit to be installed.- Install the refrigeration lines, checking that no foreignboodies get inside the piping.- Install the flare connectors and flare the ends of thepipes.Unit size 7 9 12 18 25D (m) 10 12 15 15 22L (m) 12 15 18 18 25H (m) 7 10 12 12 20MHC-MHH/BOC-BOHUnit size 7 9 12 18 25g/m 15 15 15 40 40Outdoor Unit Indoor UnitGas LineLiquid LineR22High pressureManifoldHeat pump(discharge)Cooling(suction)Heat pumpLiquidCoolingHeat pump(discharge)Heat pumpLiquidCoolingGASSCooling(suction)DLLH |
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