Bard W18HA-A Installation Instructions Manual

Bard W18HA-A Installation Instructions Manual Manual pdf 19 page image

Manual 2100-654CPage 19 of 34START UPTHESE UNITS REQUIRE R-410AREFRIGERANT AND POLYOL ESTER OIL.GENERAL1. Use separate service equipment to avoid crosscontamination of oil and refrigerants.2. Use recovery equipment rated for R-410Arefrigerant.3. Use manifold gauges rated for R-410A (800psi/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 andR-12. Although nearly azeotropic, charge withliquid refrigerant.6. R-410A operates at 40-70% higher pressurethan R-22 and systems designed for R-22 cannotwithstand this higher pressure.7. R-410A has an ozone depletion potential of zero,but must be reclaimed due to its global warmingpotential.8. R-410A compressors use Polyol Ester oil.9. Polyol Ester oil is hygroscopic; it will rapidly absorbmoisture and strongly hold this moisture in the oil.10. A liquid line dryer must be used—even a deepvacuum will not separate moisture from the oil.11. Limit atmospheric exposure to 15 minutes.12. If compressor removal is necessary, always plugcompressor immediately after removal. Purge withsmall amount of nitrogen when inserting plugs.TOPPING OFF SYSTEM CHARGEIf a leak has occurred in the system, BardManufacturing recommends reclaiming, evacuating(see criteria above) and charging to the nameplatecharge. If done correctly, topping off the systemcharge can be done without problems.With R-410A, there are no significant changes in therefrigerant composition during multiple leaks andrecharges. R-410A refrigerant is close to being anazeotropic blend (it behaves like a pure compoundor single component refrigerant). The remainingrefrigerant charge, in the system, may be used afterleaks have occurred and then “top-off” the charge byutilizing the pressure charts on the inner control panelcover as a guideline.REMEMBER: When adding R-410A refrigerant, itmust come out of the charging cylinder/tank as aliquid to avoid any fractionation, and to ensure optimalsystem performance. Refer to instructions for thecylinder that is being utilized for proper method ofliquid extraction.SAFETY PRACTICES1. Never mix R-410A with other refrigerants.2. Use gloves and safety glasses. Polyol Ester oilscan be irritating to the skin, and liquid refrigerantwill freeze the skin.3. Never use air and R-410A to leak check; themixture may become flammable.4. Do not inhale R-410A—the vapor attacksthe nervous system, creating dizziness, lossof coordination and slurred speech. Cardiacirregularities, unconsciousness and ultimatelydeath can result from breathing this concentration.5. Do not burn R-410A. This decompositionproduces hazardous vapors. Evacuate the area ifexposed.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 directsunlight.9. Never heat cylinders above 125°F.10. Never trap liquid R-410A in manifold sets, gaugelines or cylinders. R-410A expands significantlyat warmer temperatures. Once a cylinder or line isfull of liquid, any further rise in temperature willcause it to burst.WARNINGFailure to conform to these practicescould lead to damage, injury or death.