Stulz ULTRASONIC, Техническое руководство, Страница: 10 / 71

ULTRASONIC
10
Copyright STULZ GmbH 02/1997
TECHNICAL DATA ENS SERIES
4. Water Supply Solenoid Valve and Float Switch
In order to achieve optimum nebulization of the water, the water level in the
tanks has to be kept as constant as possible. To meet these requirements, a
solenoid valve and a float switch are used for automatic water supply. If the
water level in the tank falls below the standard level, the float switch will turn to
ON and the solenoid valve opens to fill the tank with water.
As soon as the standard water level has been reached, the float switch will
turn to OFF again and the solenoid valve is closed.
5. Relay (externally installed in control box) and Float Switch (dry-
running Protection)
Should the humidifier be operated with a water level in the tank being too low,
the oscillator will be damaged. To avoid any dry-running, a float switch is
inserted. If the water level falls below the safety level - for any reason
whatsoever, the float switch turns to OFF, activates the external relay which is
installed on the supply board and cuts off the electric power supply to the
oscillators.