Nortec NHDI - Manual (Page 15)

STEAM GENERATION REGULATION
The steam is produced in the steam tank by
resistive heating element technology. An external or
the internal regulator for connection as required control
the steam production fully variably from 3 to 100%.
FLUSHING - NHSC ONLY
The evaporation process increases the
concentration of minerals in the water of the steam
cylinder. A suitable volume of water must be flushed
through the steam cylinder from time to time and
replaced by fresh water to ensure that this
concentration does not exceed a specific value
unsuitable for operation. The NHSC / NHDI steam
humidifier performs a flush cycle. This consists of the
following two forms of flushing.
• Automatic flushing takes place as soon as the
water in the steam cylinder exceeds the upper
operating level (e.g. By foaming of the water).
• Flushing is a time dependent process at
preselected time intervals.
Automatic or time-dependent flushing takes place
based on the water quality and the operating data.
SCALE COLLECTOR TANK - NHSC ONLY
The minerals precipitated by the evaporation
process accumulate at the bottom of the steam
cylinder. Units designed for operation with untreated
water are equipped with a scale collector tank located
directly underneath the steam cylinder. This way the
minerals do not accumulate in the steam cylinder but
mainly in the collector tank thus extending the service
intervals and reducing the maintenance costs.
NHSC / NHDI OPERATION
STARTING OPERATION
The following procedure should be carried out in order
to operate the steam humidifier:
• Examine the steam humidifier and installation to
ensure it has been installed properly or for
possible damage.
Caution! Damaged units and units with
improper installation must not be operated.
• Open the filter valve / shut-off valve in the water
feed line.
• Switch on the external disconnect for the main
supply (Heating and control voltage).
• Ensure the valve on the NHSC mineral tank is
closed.
• Switch on the steam humidifier main switch.
The steam humidifier carries out a system test.
The display below appears and the three LEDs light
for approx. 3 seconds.
If a fault is detected during the system test, a
corresponding fault message is triggered.
If the system test is successful, the steam cylinder
fills up and a float test is carried out (function check on
the level unit). The display below appears.
Note: If a fault is detected during the float test, an
appropriate fault message is triggered
If the float test is successful, the NHSC / NHDI will
be in normal operating mode. The display below
appears and the green LED lights.
The following procedure should be carried out only
on the first occasion that the unit is operated:
• Check the function of the steam humidifier:
• Switch on the humidification by raising the set
humidity value on the humidity controller /
humidistat / NHSC / NHDI Display.
• Switch off the humidification by lowering the set
humidity value on the humidity controller /
humidistat / NHSC / NHDI Display.
• Check for correct functioning of the monitoring
equipment (external safety network).
• Set the desired humidity value on the humidity
controller/humidistat.
• Make sure no leaks are present.
The heating current switches on as soon as the
humidity controller/humidistat demands humidity. The
yellow LED lights and steam is produced after a short
delay (approx. 5 minutes).
Operating status display on the unit
The operating status is displayed in the LED on
the unit as follows:
- 12 -
NHSC/DI
ready
filling
test