York MKL/MKM 25 Technical Manual
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8CASSETTEYORK CASSETTE (EN) 035T76015-0007 - REFRIGERANT PIPING CONNECTIONSPrefabricated refrigerant piping is available as an accessory. If this is not used, piping and insulating materialsemployed must be compatible with this type of installation.The pre-charged outdoor unit does not require charging if piping length is 5 m or less. However, the inter- connectingpiping and the indoor unit must be pumped down before releasing R407C refrigerant into them from the outdoorunit.1 - Remove the cap from the service valve.2 - Connect the line to a vacuum pump and pump down to 5 Pa.3 - When pump down is finished, wait 15 minutes to detect potential circuit leakage. Open service valveson the outdoor unit.Table 2 - Maximum piping lengthsNote : Where the difference in elevation is greater than5 meters, install an oil trap every 5 meters.Unit sizeD (m)L (m)H (m)25 35 45 5520 20 24 2425 25 30 3022 22 26 26Indoor unitGas lineLiquid lineR407COutdoor unit* Note : The expansion device is located in the outdoor unit.If piping length exceeds 7.5 meters, add 40g of refrigerantR407C per extra meter.Low pressure High pressureManifoldPressure tapLiquid valve Gas valveLLHD02_MKL-MKM.p65 13/6/02, 11:08 am8 |
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