![]() ![]() The saturated suction temperatures and pressures are listed along the bottom of the chart. To understand how to read a curve sheet, follow along closely using Figure 1. ![]() ![]() Now we must apply this information to the curve sheet. We read 43 amps on our amperage meter and 230 V at the compressor terminals. The suction pressure at the compressor is 43 psig and the condensing pressure at the compressor is 260 psig. Let's look at Copeland compressor Model 3DS3-1500-TFC operating with HCFC-22. Each compressor model has its own specific curve. Then apply these four readings to the compressor curve sheet. Once you gather the suction pressure, discharge pressure, and amperage readings, record this information along with the voltage measured at the compressor terminals. We must know what the pressures are when we read the amperage.Īn amp reading alone tells us nothing. The pressure load will fluctuate up and down depending on such things as the evaporator load and ambient temperature. Think about what we have discussed so far: The mechanical load is a constant and should not change. Determining Amperage Some think the compressor's rated load amperage (RLA) is its running amperage. This curve addresses compressors that operate at a 230-V current. ![]()
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