WD_2021

AIR CONDITIONER - SYSTEMOPERATION HOW A/CWORKS METRIC EQUIVALENT

MEASUREMENT

METRIC EQUIVALENT

FORMULA OR COMMENTS

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) (Energy or heat exchange)

for power (Energy/Time), use formula: 1 BTU/hour = 0.000293 kW (kilo Watt)

REFERENCE

32° F (Fahrenheit

0° C (Celsius)

INFORMATION

102° F

40° C

[( - 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) 6.895 kPa (kilo Pascal)

1 PSI (pound per square inch)

also = 0.07 kg/cm 2

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:

HOSE SIZE

HOSE I.D. (in.)

HOSE I.D. (mm)

#6 #8

5⁄16” (0.312) 13⁄32” (0.406) 1⁄2” (0.500) 5⁄8” (0.625)

8

10 13 16

#10 #12

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.

PAGE 497