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PERFORMANCE TEST
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Install the manifold gauge set.
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Run the engine at 2,000 rpm and set the controls for maximum cooling and high blower speed.
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Keep all windows and doors open.
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Place a dry-bulb thermometer in the cool air outlet.
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Place a psychrometer close to the inlet of the cooling unit.
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Check that the reading on the high pressure gauge is 1,373-1,575 kpa (14-16 kg/cm2, 199-228 psi). If the reading is too high, pour water on the condenser. If the reading to too low, cover the front of the condenser.
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Check that the reading on the dry-bulb thermometer at the air inlet at 25-35°C (77-95°F).
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Calculate the relative humidity from the psychrometric graph by comparing the wet-and dry-bulb reading of the psychrometer at the air inlet.
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Measure the dry-bulb temperature at the cool air outlet, and calculate the difference between the inlet dry-bulb and outlet dry-bulb temperatures.
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Check that the intersection of the relative humidity and temperature difference is between Block hard line. If the intersection is within the block hard line, cooling performance is satisfactory.