Operation:
Manual Discharge Position:
Unscrew the knob counter-clockwise one
turn. This position is used mainly when
filling the system.
Service Instructions
The cartage (knob) portion of the vent contains the hygroscopic disc. The
cartridge can easily be replaced without draining the system. The disc will
deteriorate overtime It is necessary to replace the cartridge at least every two
years.
Automatic Discharge Position:
Turn the knob clockwise until it seats
completely. Valve will vent air automatically.
Replacement Cartridge:
Allow system to cool before replacing
cartridge.
Remove
cartridge
by
unscrewing knob counter-clockwise. A
small ball inside the body prevents water
from escaping. Replacement cartridge
Part number:
508100A.
CAUTION:
Corrosion or leakage can cause damage or
injury. Periodically inspect for signs of corrosion or
leakage. If corrosion or leakage is note, the vent must be
replaced. Replace the hygroscopic cartridge at least every
two years or sooner if installed in aluminum radiators.
Caleffi North America, Inc.
3883 West Milwaukee Road
Milwaukee, WI 53208
T: 414.238.2360 F: 414.238.2366
7-19
-18
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Installation Tip
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AIR VENTS
