Chilled water flow meter

Pump circulating chilled water

Discharge duct for cooling

Pump circulating condenser water

Cooling only VAV with no local heat

Duct for air leaving an equipment

Domestic water flow meter

Duct to access fresh outside air only for economizing, not ventilation

Duct used to expel air back outside

Duct for exhausting combustion

Discharge duct for heating

Hot water flow meter

Pump circulating hot water

Duct with air entering an equipment

Duct where fresh outside air and return air is mixed together

Natural gas flow meter

Discharge duct which by-passes both heating and cooling coils

Duct to access fresh outside air for both ventilation and economizer

VAV with hot water reheat

Duct returning air back to equipment

Steam flow meter

Air handler which feeds VAVs

Duct to access fresh outside air only for ventilation, not economizing

Water flow meter