12
Operation
2596995_0_EN_1905
Nortec RS
2
Operation
2.1
Functional description
The Nortec RS steam humidifier is an atmospheric steam generator. It operates on the resistance heating
principle and is designed for direct room air humidification (with blower pack) and indirect humidification
(with steam distributor) in HVAC systems.
Water supply
The water is supplied via an optional external sediment filter to the steam humidifier. It reaches the steam
cylinder via the level controlled inlet valve and the fill cup.
Note: the fill cup is designed with an internal 1" air gap, to separate the supply water from the unit water.
That means, no unit water can flow back into the supply water line.
Level regulation
The water level in the steam cylinder is continuously monitored with the level unit. If the water level
reaches a preset level (due to the evaporation process) the level unit supplies a signal to the controller.
This opens the inlet valve and the steam cylinder is filled up. When the preset operating level is reached,
the level unit supplies another signal to the controller to close the inlet valve.
The pressure equalizing pipe between the steam connection and the level unit ensures that the water
levels are the same in the steam cylinder and the level unit.
Steam generation regulation
The steam is produced in the steam cylinder by several resistive heating elements. An external or the
integrated continuous controller control the steam production fully variably from 0 to 100 %.
Alternatively the Nortec RS can be controlled also via an On/Off controller.
Flushing
The evaporation process increases the concentration of minerals in the water of the steam cylinder. A
suitable volume of water must be flushed out of the steam cylinder from time to time and replaced by
fresh water to ensure that this concentration does not exceed a level unsuitable for operation.
The Nortec RS 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 dependent on time
performs the flushing process at preselected time intervals.
Automatic or time-dependent flushing takes place depending on the water quality and the operating data.
If the lowest operating level is reached during the flushing process, the inlet valve remains open until
the water level in the steam cylinder has reached the normal working level again. If the lowest operating
level is not reached, the inlet valve is closed.
Scale collector tank
The minerals precipitated by the evaporation process sink down in the steam cylinder and accumulate
in the scale collector tank, thus extending the service intervals and reducing the maintenance work.
Units designed for operation with water from a RO system or with de-ionized water do not require a scale
collector tank as RO water and de-ionized water contains only small amounts of minerals.
