HygroMatik SteamKit H, Manual

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Page 11
4.3 Operational Sequence
The operational sequence depends on the
electrical interconnection and control of the
the kit. Following hereafter, the typical opera-
tional sequence is described for a setting of
the kit with the HygroMatik control „Stan-
dard“:
The steam humidifier is switched on by
pressing the control switch on the front panel
to the „I“ position. When the controller gener-
ates a demand for humidification, the inlet
solenoid valve (25)
*
opens and water is fed
into the steam cylinder.
Filling level in the cylinder is controlled by a
level control device (27)
*)
. In a plastic cylin-
der, connected to the steam cylinder via
hoses in the way communicating tubes are
connected, a sensor for continous propor-
tional water level survey is located.
The cylinder water is periodically blown
down. For usage of the unit with fully desain-
ated water, the blow-down function may be
blocked.
Water blow-down is achieved by means of
the blow-down pump (32)
*)
that is continously
monitored during unit operation. In case of
pump disruption, the kit is shut off.
With normal water quality, blow-down loss is
in the range of 7 to 15 % of the steam amount
produced. Depending on water quality, a full
steam cylinder blow-down is run every 3 to 8
days.
Mineral deposits settle in the open area
below the heater element(s) and are
removed through periodic maintenance. The
blow-down pump itself has wide openings
and can flush out smaller pieces of mineral
deposit. This extends the service life of the
unit and reduces the required maintenance
interval.
On blow-down, water flows from the pump
into the drain hose system.
For maintainence purposes, the cylinder
water may be pumped out by pressing and
holding the control switch in the „II“ position.
*)
numbers indicated correspond with those in
the exploded view in the „Exploded view“
chapter.
4.4 Internal Output Setting
The description following hereafter relates to
the usage of the steam humidifier kit with the
HygroMatik controls „Basic“ and „Standard“.
Continuous control is achieved by propor-
tional driving (pulse width modulation) of the
heater element(s). In this way the steam
humidifier kit can be proportionally operated
across the entire output range of 10 % - 100
% of the nominal capacity.