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Meanings of commonly used HVAC piping symbols

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Outlined below are the most commonly used hvac piping symbols and their meanings.

Click here to view easy-to-use compiled charts of these symbols.

chilled water supply line symbol

CHILLED WATER SUPPLY

chilled water return line symbol

CHILLED WATER RETURN

hot water supply line symbol

HOT WATER SUPPLY

hot water return line symbol

HOT WATER RETURN

cold water supply symbol

COLD WATER SUPPLY

cold water return symbol

COLD WATER RETURN

refrigerant line symbol

REFRIGERANT LINE

makeup water line symbol

MAKEUP WATER LINE

humidification line symbol

HUMIDIFICATION LINE

drain pipe line symbol

DRAIN PIPE

vent pipe line symbol

VENT PIPE

pressure gauge symbol

PRESSURE GAUGE

automatic air vent symbol

AUTOMATIC AIR VENT

test point symbol

TEST POINT

pipe riser-dropper symbol

PIPE RISER/DROPPER

flow direction line symbol

FLOW DIRECTION

flexible pipe connection symbol

FLEXIBLE PIPE CONNECTION

temperature gauge symbol

TEMPERATURE GAUGE

strainer symbol

STRAINER