E121
Home andBuildingControl
Honeywell AG
Phone: (49) 29329880
Zu denRuhrwiesen 3
Fax: (49) 2932988239
D-59755Arnsberg-Neheim
EN0H-183GE25R0301
50
Subject to change • All rights reserved
Function
Inside the automatic air vent there is a float whichoperates a
lever according to thewater level.When there is nowater in
the housing, then the float opens the valve. Air can therefore
be vented from the heating systemduring filling.When the
heating system has been filled, the inflowingwater closes the
valve and the vent is shut off.Water usually contains oxygen
which bubbles off duringoperationof the system and collects
at thehighest point. Theautomatic air ventmust therefore be
fittedat the air collectionposition (highest point ona boiler or
pipework circuit).
Versions
E121-3/8A =Standard version, Connection sizeR 3/8"
E121-1/2A =Standard version, Connection sizeR 1/2"
Accessories
Shutoff valve
Brass housing, high-
grade temperature-
resistant synthetic
material inner compo-
nents, hot-water-
resistant elastomer
seal ring
Z121-3/8A
Ø47
3/8"
SW 22
64
15
