HygroMatik DemiLine 12, Руководство пользователя

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Page 11
4. Operation and Installation
4.1 Mode of Action
The Imersion Heater Principle
One to three heater elements (8) are placed in a closed cylinder
and connected to alternating current. The cylinder (9) is filled
with fully demineralized water. Heat generated by the heater ele-
ments increases water temperature to approx. 100°C.
When fully demineralized water is used, the feed water is practi-
cally free of minerals. This ensures long life for the cylinder and
heater elements since virtually no mineral deposits can settle or
build up. Fully demineralized water minimizes the number of ser-
vice / maintenance checks.
The generated steam has a temperature of about 100°C and
minimal positive pressure ("pressureless” steam). It is deminer-
alized and virtually germ-free.
4.2 Installation and Method of Operation
When the hygrostat or controller signals a demand for humidifi-
cation, the inlet solenoid valve (14) opens. The solenoid valve is
designed for pressures from 100 x 10
3
to 100 x 10
4
Pascals (1 to
10 bar).
Water is fed into the cylinder (9).
The water level in the cylinder must be maintained within a spec-
ified range. If the water level is too high, the ellbow (or the filling
cup) acts as a safety overflow for water drainage. If the water
level is too low, it could cause the heater elements (8) to over-
heat. Therefore, power supply to the heater elements is shut off
when water levels are too low.
The cylinder water level is controlled by a level control (6). The
level control consists of a stainless steel cylinder with two float
switches and three reed contacts. The float switches indicate the
water level in the steam cylinder: "Dry Run", "Humidification"
and "Max. Level". The control capsule is pressure-equalized.