Panasonic U-26PE1U6 Technical Data & Service Manual

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Panasonic U-26PE1U6 Technical Data & Service Manual Manual pdf 4 page image

iiiPrecautions for Installation Using New Refrigerant1. Care regarding tubing1-1. Process tubingMaterial: Use C1220 phosphorous deoxidized copper specified in JIS H3300 “Copper and Copper Alloy SeamlessPipes and Tubes.”Tubing size: Be sure to use the sizes indicated in the table below.Use a tube cutter when cutting the tubing, and be sure to remove any flash. This also applies to distribution joints(optional).When bending tubing ø5/8" or smaller, use a bending radius that is 4 times the outer diameter of the tubing or larger.CAUTIONUse sufficient care in handling the tubing. Seal the tubing ends withcaps or tape to prevent dirt, moisture, or other foreign substancesfrom entering. These substances can result in system malfunction.OMaterialCopper tube Outer diameter 1/4 3/8 1/2 5/8Wall thickness t0.032 t0.032 t0.032 t0.04Unit: inch1-2. Prevent impurities including water, dust and oxide from entering the tubing. Impurities can cause R410Arefrigerant deterioration and compressor defects. Due to the features of the refrigerant and refrigerating machineoil, the prevention of water and other impurities becomes more important than ever.2. Be sure to recharge the refrigerant only in liquid form.2-1.defects of the unit.2-2.Since R410A is a non-azeotrope, recharging the refrigerant in gas form can lower performance and causeSince refrigerant composition changes and performance decreases when gas leaks, collect the remainingrefrigerant and recharge the required total amount of new refrigerant after fixing the leak.Check of Density LimitThe room in which the air conditioner is to beinstalled requires a design that in the event of refrig-erant gas leaking out, its density will not exceed a setlimit.The refrigerant (R410A), which is used in the air condition-er, is safe, without the toxicity or combustibility of ammonia,and is not restricted by laws imposed to protect the ozonelayer. However, since it contains more than air, it poses therisk of suffocation if its density should rise excessively. Suf-focation from leakage of refrigerant is almost non-existent.With the recent increase in the number of high densitybuildings, however, the installation of multi air conditionersystems is on the increase because of the need for effec-tive use of floor space, individual control, energy conserva-tion by curtailing heat and carrying power, etc.Most importantly, the multi air conditioner system is ableto replenish a large amount of refrigerant compared toconventional individual air conditioners. If a single unit ofthe multi air conditioner system is to be installed in asmall room, select a suitable model and installation pro-cedure so that if the refrigerant accidentally leaks out, itsdensity does not reach the limit (and in the event of anemergency, measures can be made before injury canoccur).ASHRAE and the International Mechanical Code of theICC as well as CSA provide guidance and define safe-guards related to the use of refrigerants, all of which definea Refrigerant Concentration Level (RCL) of 25 poundsper 1,000 cubic feet for R410A refrigerant.For additional guidance and precautions related torefrigerant safety, please refer to the following documents:International Mechanical Code 2012 (IMC-2012)(or more recently revised)ASHRAE 15ASHRAE 34