Honeywell E121S User Manual

E121S

Automatic air vent for solar installations

Product specification sheet

Application

The air vent is used to automatically ventilate fluid-filled systems,
preferably in solar installations.

Air in heating systems and other fluid-filled systems frequently
causes disruptions in water cycles, as well as corrosion and
noise. Therefore pay particular attention to a good ventilation.

Special Features

• Absolutely drip free

• Long-term reliability

• High ventilation capacity

• Cleaning or exchange of the sealing and internal parts after
additional installation of the AVSOLAR shutoff valve is
possible without emptying the system

• Extremely quick reaction

• Particularly compact

Construction

The automatic air vent comprises:

•Lid

•Housing

• Floater with spring

• Valve seat seals

Materials

• Brass housing

• Brass lid

• High grade, heat-resistant synthetic material float

• Stainless steel spring

• Temperature- and aging-resistant elastomer sealing parts

Range of Application

Medium Water

Medium temperature max. 150 °C

Not suitable for steam.

Technical Data

Nominal pressure max.10 bar

Operating pressure 0,5 - 10 bar

Connection size R

3

/8" and R 1/2"

EN0H-1365GE23 R1108 • Subject to change

www.honeywell.com 1

E121S Automatic air vent for solar installations

A

H

B

SW

G

Connection size G

3

/8"

Dimensions mm

A47 47
H82 82
B 10.5 10.5

SW 23 23

Weight kg 0.4 0.5

1

/2"

Method of Operation

Inside the automatic air vent there is a floater which operates a
lever according to the water level. When there is no water in the
housing, then the floater 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 therefore be fitted at the air
collection position (highest point on a boiler or pipework circuit).

Options

E121S...A = Standard version

Connection size

Accessories

Shutoff valve

Brass housing, high-grade, temperature-resistant plastic internal
parts, hot water-resistant elastomer sealing ring

for 3/8" AVSOLAR-3/8

for 1/2" AVSOLAR-1/2

Automation and Control Solutions

Honeywell GmbH
Hardhofweg
D-74821 Mosbach
Phone: [phone]
Fax: [phone]
http://europe.hbc.honeywell.com

Manufactured for and on behalf of the
Environmental and Combustion Controls Division
of Honeywell Technologies Sàrl, Rolle, Z.A. La
Pièce 16, Switzerland by its Authorised
Representative Honeywell GmbH

EN0H-1365GE23 R1108
Subject to change without notice
© 2008 Honeywell GmbH

www.honeywell.com