HERZ thermostatic head “H” in robust design to prevent vandalism, theft and unauthorised operation.

With liquid sensor (hydrosensor), set point range 8-26°, with automatic frost protection. Mounting and removal only possible with tightening tool 1 9554 01 and Allen key 1 6616 00 (both must be ordered separately). Setting of the set point with unlocking tool 1 9554 00 (enclosed), set point adjustment is locked. Setting indicator remains concealed in locked position.

The maximum temperature value set with the locked set point setting can be reduced externally by 10 K (1 9861 98) or 4 K (1 9861 48) by means of a coin slot operation without changing the locked base setting.