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1. Installation
It is necessary during installation to observe codes of
good practice, to comply with local requirements and to
follow the installation instructions. The installation lo-
cation should be protected against frost and be easily
accessible.
1.1. Assembly
1. Screw in the automatic air vent at the highest point
of the boiler or circuit in the heating system using a
seal material (PTFE or hemp).
Use an open-ended wrench and screw in tightly.
•
2. Ensure that the cap of the leak protection is fully
screwed down onto the lid.
3. Set the automatic air vent in the open position by
turning the housing until the ❍ symbol
corresponds with the line on the connection piece.
4. Fill system.
2. Method of Operation
Inside the automatic air vent there is a float which op-
erates a lever according to the water level. When there
is no water in the housing, then the float opens the
valve. Air can therefore be vented from the heating
system during filling. When the heating system has
been filled, the inflowing water closes the valve and the
vent is shut off. Water usually contains oxygen which
bubbles off during operation of the system and collects
at the highest point. The automatic air vent must there-
fore be fitted at the air collection position (highest point
on a boiler or pipework circuit). The closing force of the
float valve is very small and therefore water-borne dirt
can prevent the valve fully closing, which results in the
valve dripping slightly. Expanding discs are built into
the valve to prevent this dripping occurring. These
discs expand when wet and then shut off a secondary
valve, thereby preventing leakage.
Honeywell GmbH
GB
3. Inspection and Maintenance
The automatic air vent must be regularly inspected be-
cause the function can be affected by the presence of
collected dirt.
1. Close the automatic air vent by turning the housing
until the symbol ● corresponds with the line on the
connection piece.
2. Unscrew the cover and remove complete with the
float.
3. Clean all parts carefully or if necessary replace with
spare part No. 0900577 and then reassemble.
4. Check whether the cap of the leak protector is fully
screwed down on the cover.
4. Range of Application
Hot water heating systems, radiators, wall and ceiling-
mounted air heaters, air collection vessels, pipe cir-
cuits, boilers and air separators.
Not suitable for mineral oil or liquids with mineral-oil
based additives.
5. Technical Data
Operating temperature: max. 110 °C
Operating pressure:
Connection sizes:
6. Options
EA 122 - AA = Connection sizes R
EA 122 - BA = Connection sizes R
EA 122 - AB = Connection sizes G
adapter for R
7. Service Parts
Cover complete with float
Leak protection discs complete
(Pack of 5)
3
max. 6 bar
G
/
" +
/
"
1
3
8
8
or G
/
" +
/
"
1
3
4
8
or G
/
" +
/
" (with adapter
1
3
8
8
for R
/
")
1
2
/
" +
/
"
1
3
8
8
/
" +
/
"
1
3
4
8
/
" +
/
" (with
1
3
8
8
/
")
1
2
Part No. 0900577
Part No. 0900761
MU1H-2706GE23 R0216
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