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II. REFRIGERANT CHARGE DETERMINATION AND 4. Determine the systems superheat as follows: <br /> ADJUSTMENT a. Read the system's suction pressure,then using Table <br /> A WARNING III determine the system's saturated suction tempera <br /> ture. <br /> To avoid possible injury, explosion or death, practice <br /> safe handling of refrigerants. b. Read the suction line temperature. <br /> c. The system's superheat = the suction line tempera <br /> COOLING CYCLE: ture -the saturated liquid temperature. <br /> The method to insure that the heat pump/cooling system is <br /> properly charged is by weighing in the amount of refrigerant SUCTION SATURATED SUCTION <br /> specified on the outdoor sections nameplate, with additional PRESSURE K P a TEMPERATURE °C <br /> adjustments for line size,line length,and other system compo- <br /> nents. 615 -3.3 <br /> 641 -2.2 <br /> SYSTEMS WITH MORE THAN 7.6 METERS OF REFRIG- 668 -1 .1 <br /> ERANT LINE REFRIGERANT Allowance 695 0 <br /> Systems having more than 7.6 m of interconnecting refriger- 724 1 .1 <br /> ant lines require an additional charge allowance of R410A per 753 2.2 <br /> Table II. 783 3.3 <br /> 813 4.4 <br /> 847 5.6 <br /> NOTE - When installing systems were the indoor outdoor 879 6.7 <br /> sections are separated by more than 7.6 meters, note the 912 7.8 <br /> maximum elevation separation limitations per the diagram in 946 8.9 <br /> the LOCATION section of these instructions. <br /> Allowance (R410A) gram/meter 20.5 TABLE III -Saturated Suction Pressure (R410A) <br /> 5. Refer to Table IV for the proper system superheat.Adjust <br /> the charge as necessary by adding charge to lower the <br /> LINE LIQUID SUCTION O. D. mm LINE LINE superheat or bleeding the charge to raise the superheat. <br /> 6.4 20.5 6. Remove the service gauge set's lines carefully-Escaping <br /> 9.5 54.0 liquid refrigerant can cause burns. <br /> 12.7 106.0 <br /> 15.9 173.0 3.8 <br /> 19.1 5.6 <br /> 22.2 7.4 <br /> 28.6 14.0 <br /> 34.9 20.5 <br /> TABLE II - Line Charge <br /> SUPERHEAT METHOD : <br /> 1. With both base valves fully open, connect a set of ser- <br /> vice gauges to the base valves'service port, being care- <br /> ful to purge the lines. <br /> 2. Allow the system to operate at least 10 minutes or until <br /> the pressures stabilize. <br /> 3. Temporarily install a thermometer on the suction(large) <br /> line near the condensing unit's base valve. Make sure <br /> that there is good contact between the thermometer and <br /> the refrigerant line and wrap the thermometer and line <br /> with insulating tape to assure accurate readings. <br /> 7 <br /> Downloaded from www.Manualslib.com manuals search enginc <br />