2024 WD CATALOG

HOW A/C WORKS

AIR CONDITIONER - SYSTEM OPERATION HOW A/C WORKS METRIC EQUIVALENTS

MEASUREMENT

METRIC EQUIVALENT

FORMULA OR COMMENTS

TYPICAL PLUMBING SCHEMATIC

1” (inch)

2.54 cm (centimeters)

I

PS

30

1 cu in (cubic inch)

16.387 cm 3

-30

Compressor

0 P

17

SI

1 ft (foot)

30.48 cm

1 ft = 12 inches

1 fl. oz. (fluid ounce)

29.5735 cm 3

Hot High Pressure Gas

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

REFERENCE

Low Pressure Gas (suction side)

32° F (Fahrenheit

0° C (Celsius)

INFORMATION

INFORMATION

102° F

40° C

[( - 32) / 9] x 5 = Y°C

Cold, Low Pressure Gas

1 CFM (cubic foot/minute)

1.699 m 3 /h (cubic meter/hour)

#8

Ho G se as

1# (lb or pound)

0.45359 kg (kilogram) 6.895 kPa (kilo Pascal)

se

Ho

#1 Expansion Valve

#8

s

1 PSI (pound per square inch)

also = 0.07 kg/cm 2

e

Ga

os

2 H Ga

s

WARM INLET AIR

#8

Condenser

ho L i se qu 2 id 00 °

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:

se

#8

Ho

COOL OUTSIDE AIR FLOW

Ho G se as

#6 Liq

uid

COOL AIR TO THE CAB

Metered Refrigerant

#6 Ho Liq se uid 13 5°

HOSE SIZE

HOSE I.D. (in.)

HOSE I.D. (mm)

HEATED OUTSIDE AIR FLOW

Receiver Drier

Evaporator

#6 #8

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

8

10 13 16

Thermostat

High Pressure Liquid

#10 #12

LOW SIDE HIGH SIDE

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.

Air conditioner components are connected together to illustrate system operation. The components shown are not to scale. The refrigerant and refrigerant oil are clear in color and not visible in this drawing; however, we've attempted to suggest temperature variants through the use of values of gray in the pipeline. The small arrows inside the components and connecting hoses show the direction of refrigerant flow (refrigerant circuit).

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