Nortec NH-EL Series - Manual (Page 8)

5 | Introduction
NH-EL Models
The NH-EL with its Integrated Controller and state-of-the-art features and options is the most
advanced electrode steam humidifier available. As well as controlling the operation of the
humidifier, the Integrated Controller can be connected directly to BACnet and to the Internet.
The NH-EL is available in capacities ranging from 5 lb/hr (2 kg/hr) to 200 lb/hr (90 kg/hr). NH-
EL humidifiers are packaged in three different cabinets depending on capacity. Figure 3: NH-EL
Sizes shows the configuration and relative size of the three different cabinets. NH-EL models up
to 100 lb/hr (45 kg/hr) are also available with a built on blower pack. Table 3 provides
specifications for the NH-EL product line.
Figure 3: NH-EL Sizes
Double Unit (NH-EL 150-200)
NH-EL double units have two cylinders to provide increased capacity. The construction and
installation of double units is identical to units with a single cylinder with the following
exceptions:

Double units have two driver boards (designated A and B). One driver board controls each
cylinder. (See Figure 3: NH-EL Sizes).

Double units can operate both cylinders in series or parallel from a single set of control
signals or independently based on two sets of control signals (see Double Mode (NH-EL 150-
200 only) on page 56 for configuration instructions).

Independent Operation - If configured for independent operation then 2 sets of control
wiring must be provided. Control wiring for each cylinder must be connected to the
cylinder’s corresponding driver board/terminal strip and each cylinder performs
independent of the other.

Parallel Operation - If configured for parallel operation then only one set of control wiring is
required and the cylinders operate in parallel. The advantage is even wear on both cylinders.

Series Operation – If configured for series operation, then only one set of control wiring is
required and the cylinders operate in series. Cylinder A’s output range is 0-50% and
Cylinder B’s output range is 50-100%. The advantage is the lower turndown ratio of one
cylinder.

Double units have one primary power connection but have individual fill, drain, and steam
outlet connections for each cylinder.
NH-EL 005-030 NH-EL 050-100 NH-EL 150-200
Fill Connections Drain Connections