HERZ WTH Thermostatic Head with Contact Sensor 20-50°C M28mm Thread 1742006

Fields of Application
For installation on all HERZ valves suitable for thermostatic operation. For article and order numbers, dimensions and forms of delivery see the respective product standard sheets.
Mode of Operation
In the HERZ-Thermostat with contact sensor, the change of volume of the hydrosensor liquid filling is transmitted through a capillary tube into a system of bellows which on its part actuates the valve spindle. The thermostatic valve (control element) is closed when the pipe temperature rises. The temperature scale is directly on the handwheel, temperature adjustment is performed by means of this scale.

Setting options, handwheel scale, maximum setting for 9420
By setting the scale marks opposite the pointer it is possible to achieved approximately the following temperatures in the room. Deviations of a few degrees of temperature (K) are possible according to the mode of installation and the design of the heating system.

Thermostatic Head Installation
1. Unscrew screw cap or handwheel from the thermostatic valve body.
2. Open thermostatic head completely, place union nut on the valve. In doing so, turn the thermostatic
head in such a way that the handwheel scale can be read easily.
3. Tighten union nut moderately with 30 mm open-end-wrench.
4. Test for proper functioning by turning the handwheel and set the thermostat to the desired temperature.
Contact Sensor
The contract sensor and its base are attached to the pipe by means of clips; however, it can also be placed in a submersible sleeve. Flawless heat transmission must be ensured.
Theft Protection
To prevent theft retaining clips are available that are installed over the fastening nut and which can only be opened with a special key.