Daikin AGZ 025D Operating & Maintenance Manual

Daikin AGZ 025D Operating & Maintenance Manual Manual pdf 75 page image

OMM 1166-1 AGZ 025D through 190D 75ServiceR-410ARefrigerant TerminologyBubble Point: The temperature/pressurewhere bubbles first appear when heat is addedto a liquid refrigerant. Used to measure sub-cooling.Dew Point: The temperature/pressure wheredroplets first appear when heat is removedfrom a refrigerant gas. Used to measuresuperheat.Fractionalization: A change in refrigerantcomposition due to the tendency of the higherpressure refrigerant to leak at a faster rate,should a system have leakage from a statictwo-phase region.Glide: The total difference of Dew and BubblePoint at a specific condition. Mid-Point orMean: Measurement half way between Dewand Bubble Points.Miscibility: The ability of a refrigerant and oilto mix and flow together.Solubility: The effect of refrigerant on theviscosity of a lubricant.SafetyComparable to R-22; ANSI/ASHRAE safetygroup A1.Always carry and be familiar with MSDSinformation for R-410a.Store refrigerant in clean, dry area out of directsunlight.Never heat or store cylinders above 125° F.Note vehicle precautions!Never tamper with cylinder valves or pressurerelief valves. (Typical relief for R-410A is 525psig).Never refill disposable cylinders.Verify cylinder hook-up.Verify cylinder label and color code match. R-410A is rose/light maroon. Must be DOTapproved, R-410A with 400 psig rating. Opencylinders slowly.Avoid rough handling of cylinders and secureas appropriate. Cap when not in use.Do not overfill recovery cylinders orovercharge units.Check gauge calibration before every use andmanifold set for leaks regularly.Be aware of pneumatic and possiblehydrostatic pressure potentials.Never pressurize systems with oxygen orref/air mix. R-410A, R-407C, R-134A, & R-22are flammable with low air mix.Wear protective clothing. Impervious glovesand splash goggles should be worn.Avoid contact with liquid refrigerant (R-410A -60.8°F @ atms.) due to corrosion and freezinghazards.Avoid exposure to vapors. 1000 ppm/8 hr.Evacuate areas in cases of large releases. R-410A is heavier than air and can causeasphyxiation, narcotic and cardiac sensationeffects.Evacuate systems and break vacuum (0 psig)with nitrogen before welding or brazing.Always ventilate work areas before using openflames. Exposure to open flames or glowingmetal will form toxic hydrofluoric acid &carbonyl fluoride. No smoking!Make sure all tools, equipment, andreplacement components are rated for therefrigerant used.POE Lubricants!WARNINGPOE oil must be handled carefully using properprotective equipment (gloves, eye protection, etc.)The oil must not come in contact with certainpolymers (e.g. PVC), as it may absorb moisture fromthis material. Also, do not use oil or refrigerantadditives in the system.POE type oil is used for compressorlubrication. This type of oil is extremelyhydroscopic which means it will quickly