Nortec NH Series - Manual (Page 8)

5 | Introduction
NHRS Models
The NHRS is Nortec’s flagship resistive element electric humidifier. Since it can accept a variety
of supply water types (potable, Reverse Osmosis, De-Ionized), it is very robust and useful in a
wide set of applications. The NHRS is available in capacities ranging from 10 lb/hr (4.5 kg/hr)
to 180 lb/hr (81.6 kg/hr). NHRS humidifiers are packaged in two different cabinets, depending
on their capacity. Figure 3 shows the configuration and relative size of the different cabinets.
Table 3 on page 7 provides specifications for the NHRS product line.
Figure 3: NHRS Models
Double Unit (NHRS 135-180)
NHRS double units have two tanks to provide increased capacity. The construction and
installation of double units is identical to units with a single tank with the following exceptions:

In addition to having two tanks, double units also have two Driver Boards. One Driver
Board controls each tank.

Double units can operate both tanks in series or parallel from a single control signal

Parallel Operation – If configured for parallel operation, only one set of control wiring is
required. The tanks operate in parallel giving the advantage of even wear on both tanks.

Series Operation – One tank’s output range is 0-50% and the other tank’s output range
is 50-100%. An advantage is that a lower turndown ratio can be applied to one tank.

Hybrid Mode – One tank operates using Solid State Relay switching, the other tank
operates using contactor switching. See P/N 2530631.

Double units have one primary power connection, but have individual fill, drain, and
steam outlet connections for each tank.