Contents
EB 2231 EN
3
1
Design and principle of operation ..................................................................3
2 Installation ....................................................................................................4
2.1
Types 2231 and 2232 (bulb sensor)
................................................................
4
2.2
Types 2233, 2234, and 2235 (air sensor)
.......................................................6
2.3
Capillary tube
...............................................................................................6
2.4
Operating element
.........................................................................................7
3 Operation .....................................................................................................7
3.1
Adjusting the set point
....................................................................................7
3.2
Correcting the set point dial
............................................................................7
1 Design and principle of oper-
ation
The thermostat is used in combination with a
control valve to regulate the temperature.
The thermostat can be fastened directly to
the control valve or using a double adapter.
A double adapter with or without locking fa-
cility allows a further thermostat to be con-
nected to achieve additional temperature
regulation or limitation.
The thermostat comprises the temperature
sensor, set point adjuster, capillary tube, and
operating element.
Depending on the field of application, the
versions shown on the front cover can be se-
lected.
The thermostats operate according to the liq-
uid expansion principle. When, for example,
the temperature at the temperature sensor
(19) increases, the liquid contained in the
sensor expands, causing the pin (9) of the
operating element to be pushed upward by
the bellows (10). This travel motion acts on
