Nortec NHTC User Manual download pdf (Page 11)

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2008-10-01

1. INTRODUCTION

The NHTC humidifier is controlled by Nortec’s Patented Auto adaptive Water Management

Control System. This system allows the humidifiers to adapt to basically any potable

incoming water and changes that occur to the water supply. This eliminates the need to

readjust drain timers, changes complete cylinders or time consuming adjustment of

electrode spacing’s. The system also adjusts the drain rate of the humidifier to reduce the

amount of drain water exiting the humidifier as water conditions change. This reduces

energy loss due to excessive draining of hot water and extends cylinder life since less water

and minerals enter the humidifier.

The following is a brief description of how the Auto-Adaptive water Management System

works.

The electrode steam system produces pure uncontaminated steam with variable output

through electronic power control of the electrodes. Water borne minerals remain in the

cylinder and are periodically flushed out through the automatic cylinder drain. On NHTC and

NHPC models the drain automatically empties the steam cylinder if it is not operated for

three days. Solid mineral scale sinks to the bottom of the cylinder which, when filled with

residue, is easily removed and replaced.

A. PROPORTIONAL + INTEGRAL AUTO-ADAPTIVE CONTROL SYSTEM FOR THE

NHTC/ NHPC

(1) NORTEC’s patented P+I Auto-Adaptive control system allows the unit to operate at

an optimal low water level using the same fixed electrode spacing regardless of the

incoming water conditions. Boiling of the water allows the minerals in the water to

remain behind in the cylinder. This raises the contained water conductivity to a

value higher than the incoming water. The P+I Auto-Adaptive control system

monitors and adjusts the contained water conductivity as these changes occur.

(2) The humidifiers are designed to produce full steam output at the lowest possible

electrode coverage to obtain maximum cylinder life.

(3) The units operate between A and D of the main steam output demand.

Accordingly, the current flow between the electrodes in the cylinder is maintained

between these pre-established limits programmed into the P+I Auto-Adaptive

control system.

(4) As the water boils away and the electrode coverage is reduced, the steam output is

also reduced slightly. A pre-determined design parameter of every NORTEC

cylinder is the known time (To) (time optimum) that it takes to boil down from A to

D of output (also referenced to as amp trigger points) at a pre-designed contained

water conductivity. (See Figure 2.)

(5) Whenever the conductivity in the cylinder water is lower than the designed

conductivity, the (Ta) (time actual) to boil down from A to D will be longer than the

To. (See Figure 3.)

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Nortec NHTC User Manual Page 11