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AIR CONDITIONER - SYSTEMOPERATION
PAGE 623
REFERENCE
INFORMATION
HOW A/CWORKS
1” (inch)
2.54 cm (centimeters)
1 cu in (cubic inch)
16.387 cm
3
1 ft (foot)
30.48 cm
1 ft = 12 inches
1 fl. oz. (fluid ounce)
29.5735 cm
3
1 BTU (British Thermal Unit)
0.25199576 kcal (kilocalorie)
for power (Energy/Time), use formula:
(Energy or heat exchange)
1 BTU/hour = 0.000293 kW (kilo Watt)
32° F (Fahrenheit
0° C (Celsius)
102° F
40° C
[(<X°F> - 32) / 9] x 5 = Y°C
1 CFM (cubic foot/minute)
1.699 m
3
/h (cubic meter/hour)
1# (lb or pound)
0.45359 kg (kilogram)
1 PSI (pound per square inch)
6.895 kPa (kilo Pascal)
also = 0.07 kg/cm
2
MEASUREMENT
METRIC EQUIVALENT
FORMULA OR COMMENTS
HOSE SIZE
HOSE I.D. (in.)
HOSE I.D. (mm)
#6
5⁄16” (0.312)
8
#8
13⁄32” (0.406)
10
#10
1⁄2” (0.500)
13
#12
5⁄8” (0.625)
16
HOSE SIZES
A/C hose size is determined by the inside diameter of the hose. Hose sizes are also known by the
“6, 8, 10, and 12” number designations. The chart below shows hose inside diameters (I.D.) and their cor-
responding size numbers:
FITTING SIZES
Fitting sizes are identified generally as “6, 8, 10, and 12”. These numbers come from 6/16 of an inch,
8/16”, 10/16” and 12/16”, which generally identify the tube diameter at the point that it passes through the
attached threaded nut.
NOTE
: Metric threaded connections are not included in this sizing method.
METRIC EQUIVALENT