THESE UNITS REQUIRE R-410A REFRIGERANT AND POLYOL ESTER OIL.
GENERAL:
1.Use separate service equipment to avoid cross contamination of oil and refrigerants.
2.Use recovery equipment rated for R-410A refrigerant.
3.Use manifold gauges rated for R-410A (800 psi/250 psi low).
4.R-410A is a binary blend of HFC-32 and HFC-125.
5.R-410A is nearly azeotropic - similar to R-22 and R-12. Although nearly azeotropic, charge with liquid refrigerant.
6.R-410A operates at 40-70% higher pressure than R-22, and systems designed for R-22 cannot withstand this higher pressure.
7.R-410A has an ozone depletion potential of zero, but must be reclaimed due to its global warming potential.
8.R-410A compressors use Polyol Ester oil.
9.Polyol Ester oil is hygroscopic; it will rapidly absorb moisture and strongly hold this moisture in the oil.
10.A liquid line dryer must be used - even a deep vacuum will not separate moisture from the oil.
11.Limit atmospheric exposure to 15 minutes.
12.If compressor removal is necessary, always plug compressor immediately after removal. Purge with small amount of nitrogen when inserting plugs.
TOPPING OFF SYSTEM CHARGE
If a leak has occurred in the system, Bard Manufacturing recommends reclaiming, evacuating (see criteria above), and charging to the nameplate charge. However, if done correctly, topping off the system charge can be done without problems.
With R-410A, there are no significant changes in the refrigerant composition during multiple leaks and recharges. R-410A refrigerant is close to being an azeotropic blend (it behaves like a pure compound or single component refrigerant). The remaining refrigerant charge, in the system, may be used after leaks have occurred and then “top-off” the charge by utilizing the charging charts on the inner control panel cover as a guideline.
REMEMBER: When adding R-410A refrigerant, it must come out of the charging cylinder/tank as a liquid to avoid any fractionation, and to insure optimal system performance. Refer to instructions for the cylinder that is being utilized for proper method of liquid extraction.
WARNING
Failure to conform to these practices could lead to injury or death.
SAFETY PRACTICES:
1.Never mix R-410A with other refrigerants.
2.Use gloves and safety glasses. Polyol Ester oils can be irritating to the skin, and liquid refrigerant will freeze the skin.
3.Never use air and R-410A to leak check; the mixture may become flammable.
4.Do not inhale R-410A – the vapor attacks the nervous system, creating dizziness, loss of coordination and slurred speech. Cardiac irregularities, unconsciousness and ultimate death can result from breathing this concentration.
5.Do not burn R-410A. This decomposition produces hazardous vapors. Evacuate the area if exposed.
6.Use only cylinders rated DOT4BA/4BW 400.
7.Never fill cylinders over 80% of total capacity.
8.Store cylinders in a cool area, out of direct sunlight.
9.Never heat cylinders above 125°F.
10.Never trap liquid R-410A in manifold sets, gauge lines or cylinders. R-410A expands significantly at warmer temperatures. Once a cylinder or line is full of liquid, any further rise in temperature will cause it to burst.
