Daikin Trailblazer AGZ030-101E Installation, Operation And Maintenance Manual page 112

R-410A Refrigerant
Terminology
Bubble Point: The temperature/pressure where bubbles first
appear when heat is added to a liquid refrigerant. Used to
measure sub-cooling.
Dew Point: The temperature/pressure where droplets first
appear when heat is removed from a refrigerant gas. Used to
measure superheat.
Fractionalization: A change in refrigerant composition due
to the tendency of the higher pressure refrigerant to leak at a
faster rate, should a system have leakage from a static two-
phase region.
Glide: The total difference of Dew and Bubble Point at a
specific condition. Mid-Point or Mean: Measurement half way
between Dew and Bubble Points.
Miscibility: The ability of a refrigerant and oil to mix and flow
together.
Solubility: The effect of refrigerant on the viscosity of a
lubricant.
Safety
• ANSI/ASHRAE safety group A1.
• Always carry and be familiar with MSDS information for
R-410A.
• Store refrigerant in clean, dry area out of direct sunlight.
• Never heat or store cylinders above 125° F. Note vehicle
precautions!
• Never tamper with cylinder valves or pressure relief
valves. (Typical relief for R-410A is 525 psig).
• Never refill disposable cylinders.
• Verify cylinder hook-up.
• Verify cylinder label and color code match. R-410A is
rose/light maroon. Must be DOT approved, R-410A with
400 psig rating. Open cylinders slowly.
• Avoid rough handling of cylinders and secure as
appropriate. Cap when not in use.
• Do not overfill recovery cylinders or overcharge units.
• Check gauge calibration before every use and manifold
set for leaks regularly.
• Be aware of pneumatic and possible hydrostatic pressure
potentials.
• Never pressurize systems with oxygen or ref/air mix.
R-410A, R-407C, R-134a, & R-22 are flammable with low
air mix.
• Wear protective clothing. Impervious gloves and splash
goggles should be worn.
• Avoid contact with liquid refrigerant (R-410A -60.8°F @
atms.) due to corrosion and freezing hazards.
• Avoid exposure to vapors. 1000 ppm/8 hr.
• Evacuate areas in cases of large releases. R-410A is
heavier than air and can cause asphyxiation, narcotic and
IOM 1206-13 • TRAILBLAZER MODEL AGZ CHILLERS
®
cardiac sensation effects.
• Evacuate systems and break vacuum (0 psig) with
nitrogen before welding or brazing.
• Always ventilate work areas before using open flames.
Exposure to open flames or glowing metal will form toxic
hydrofluoric acid & carbonyl fluoride. No smoking!
• Make sure all tools, equipment, and replacement
components are rated for the refrigerant used.
POE Lubricants
Polyolester (POE) oil is used for compressor lubrication. This
type of oil is extremely hydroscopic which means it will quickly
absorb moisture if exposed to air and may form acids that can
be harmful to the chiller. Avoid prolonged exposure of POE oil
to the atmosphere to prevent this problem.
It is important that only the manufacturer's recommended oils
be used. Acceptable POE oil types are:
• CPI/Lubrizol Emkarate RL32-3 MAF
• Copeland Ultra 32-3 MAF
• Parker Emkarate RL32-3MAF
• Virginia LE323MAF
• Nu Calgon 4314-66
POE oil must be handled carefully using proper protective
equipment (gloves, eye protection, etc.) The oil must not come
in contact with certain polymers (e.g. PVC), as it may absorb
moisture from this material. Daikin Applied recommends
against the use of PVC and CPVC piping for chilled water
systems. Also, do not use oil or refrigerant additives in the
system.
Polyolester Oil, commonly known as POE oil is a synthetic
oil used in many refrigeration systems, and is present in this
Daikin product. POE oil, if ever in contact with PVC/CPVC, will
coat the inside wall of PVC/CPVC pipe causing environmental
stress fractures. Although there is no PVC/CPVC piping in
this product, please keep this in mind when selecting piping
materials for your application, as system failure and property
damage could result. Refer to the pipe manufacturer's
recommendations to determine suitable applications of the
pipe.
Procedure Notes
• Use only new sealed metal containers of oil to insure
quality.
• Buy smaller containers to prevent waste and
contamination.
• Use only filter driers designed for POE and check
pressure drops frequently.
• Test for acid and color at least annually. Change filter
driers if acid or high moisture (> 200 ppm) is indicated (<
100 ppm typical).
• Evacuate to 500 microns and hold test to insure systems
are dry.
112
Unit Maintenance
WARNING
WARNING
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