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
[(
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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