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APPLICATION
& SERVICE GUIDE
HFC Refrigerant R410a
Used In
GeoMax2
Geothermal Heat Pump Systems
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R410a Application and Service Guide Although the bulk of this manual is information utilize a more traditional table with only one pressure regarding R410a, R407c will also be discussed for column as shown in Table 2. purposes of comparison and since it is one of the so- called new refrigerants. What is “Fractionation”? Many of the newer refrigerants are a blend of two or more R410a Overview other refrigerants. At various conditions these compo- R410a is a non-chlorine based (HFC) refrig
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R410a Application and Service Guide Table 2. R410a Pressure/Temperature Chart moisture VERY easily. For this reason any compressor using POE oil should only be exposed to ambient air for short periods of time during manufacture or service. See R410a the service section of this manual for more information. T T Temperature emperature Pressure Condenser/Evaporator Heat Exchangers °F psig The heat exchangers must be designed to have a working -15 31.3 pressure above the 600 psig level. In so
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R410a Application and Service Guide Figure 1. PPM of Water Absorbed Over Time used in R410a systems. Older R22 leak detectors and Ha- lide torch leak detectors can not be used in R410a service. NEVER use a mixture of air and R410a to leak check. The mixture may become fl ammable at pressures above POE: Continues to absorb moisture amtospheric. Nitrogen and trace R410a or nitrogen alone can be safely used for leak testing in R410a systems. Six approved leak detector types for alternati
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R410a Application and Service Guide • 35% annual leak rate of commercial and industrial Evacuation refrigeration Heat Controller recommends two evacuation methods, the • 15% annual leak rate comfort cooling chillers and deep vacuum method and the “Triple Vac” method. all other equipment The Deep Vacuum Method The deep vacuum method requires a vacuum pump ca- R407c Considerations pable of at least a 500 micron vacuum and a micron gauge capable of measuring this vacuum. The deep vacuum R407c
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R410a Application and Service Guide An overcharged TXV unit can be identifi ed by: • A throttling valve (Figure 3) to ensure the liquid vaporizes as it enters the suction line of the unit. • High subcooling • Τhe gauge set valve as a throttling device to restrict • High head pressures liquid from fl ooding the compressor during charging. Even though R410a has a very small fractionation po- Recharging should always be accomplished by using the tential it cannot be ignored completely when charg
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R410a Application and Service Guide 5. Operate system for 10 hours. Monitor pressure 4. Measure the suction line temperature just prior to drop across filter driers. If pressure drop exceeds 3 psi entering the compressor. replace driers. Be sure to purge system with dry 5. Subtract the saturation temperature from the suc- nitrogen when replacing driers. If suction line drier tion temperature to fi nd the superheat. Consult Table must be replaced retest pressure drop after additional
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SAFETY AND HANDLING OVERVIEW ASHRAE Standard 15 details safety precautions when handling refrigerants in commercial systems and should be read and understood. Refrigerants are especially dan- gerous in confi ned spaces. • R410a has a much higher pressure (+60%) associated with its operation. Use caution when handling and ensure proper tools and equipment. • Use an R410a approved recovery device. Recov- ery cylinders must have a service pressure rating of 400 psig (DOT 4BA 400 and DOT 4BW
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1900 Wellworth Ave., Jackson, Michigan 49203 • Ph. 517-787-2100 • Fax 517-787-9341 THE QUALITY LEADER IN CONDITIONING AIR www.heatcontroller.com 02/07
