WIKA air2guide A2G-65 Manual De Instrucciones página 10

6. Commissioning, operation
Connection diagram
GB
The switch in the frost protection thermostat trips when the tempera-
ture over a capillary length of at least 60 cm drops below the selected
set point (contact 1-4 makes). Simultaneously, contact 1-2 breaks
and can be used as a signal contact. An automatic reset (contact 1-2
makes) occurs when the temperature once again exceeds the selected
set point. The air2guide AFT is "intrinsically safe", i.e. in the event of
any damage to the capillary tube diaphragm system, it automatically
switches to the heating function. Contact 1-4 makes and can thus be
used as an operating contact. The air temperature is measured over the
full length of the sensor (capillary tube).
Commissioning
It is recommended to mount the frost protection thermostat on a special
plate (slide-in module), directly downstream of the heating coil. The
connecting cable must therefore be long enough to enable the plate to
be inserted and removed smoothly. For heating coils with a very large
cross section, several frost protection thermostats can be fitted and
connected in series. In such cases, the temperature set point is set
individually for each frost protection thermostat.
10
1 - 2 Normal operation
1 - 4 Risk of frost
WIKA operating instructions air2guide model A2G-65