20
PIPING COMPONENTS
LEGEND
*Check all system component pressure ratings (coils, valves, pumps, etc.) with manufacturer
and any applicable local or national piping codes prior to specifying system pressure rating.
SYMBOL/SKETCH DESCRIPTION
C
V
FACTOR RATING*
1
/
2
3
/
4
PSIG F
MANUAL AIR VENT: Threaded brass needle valve
with screwdriver slot for adjustment.
Application — Body brazed into high point of heat-
ing and cooling coils for bleeding air from coil. Stan-
dard item on all hydronic coils (not used on steam
or DX coils). Should not be used in lieu of main sys-
tem air vents.
N/A N/A 400 100
AUTOMATIC AIR VENT: Nickel plated brass valve,
fiber-disc type, with positive shut-off ballcheck and
quick vent feature via knurled vent screw.
Application — Optional replacement for manual air
vent. Automatically passes minute quantities of air
through the fiber discs which expand upon contact
with water, completely sealing the valve. As air
accumulates, the fiber discs dry and shrink, repeat-
ing the cycle. Not recommended for removing large
quantities of air encountered during initial start-up
or subsequent draining and refilling. Should not be
used in lieu of main system air vents.
N/A N/A 125 240
Cv — Coefficient of Velocity
DX— Direct Expansion
Application data (cont)
Selection procedure
Refer to the Carrier Electronic Selection Program for infor-
mation to determine unit sizing for your needs.
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