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NH
TM
Series
NHTC / NHPC
ELECTRODE
STEAM HUMIDIFIER
Engineering Manual
2538144-B
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PROPRIETARY NOTICE This document and the information disclosed herein are proprietary data of WALTER MEIER LTD. Neither this document nor the information contained herein shall be reproduced used, or disclosed to others without the written authorization of WALTER MEIER LTD., except to the extent required for installation or maintenance of recipient’s equipment. All references to the NORTEC name should be taken as referring to WALTER MEIER LTD. LIABILITY NOTICE NORTEC does not accept any liab
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TABLE OF CONTENTS Subject Page 10-00 ELECTRODE STEAM ENGINEERING 1. INTRODUCTION WHY ELECTRODE STEAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 A. PROPORTIONAL + INTEGRAL AUTO-ADAPTIVE CONTROL SYSTEM FOR THE NHTC/NHPC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 B. NH CAPACITY ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 C. DRAIN CYCLE AND CYLINDER LIFE . . . .
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Subject Page 7. CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 B. ON/OFF CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 C. MODULATING CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
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LIST OF FIGURES Figure Page 10-00 ELECTRODE STEAM ENGINEERING Figure 1. NHTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Figure 2. Optimum Boiling Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 3. Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Figure 4. Typical Auto-Adaptive Operation . . . .
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Figure Page Figure 33. Humidifier Controlled by Air Proving, On/Off Duct Mounted High Limit and Modulating Wall Mounted Space Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Figure 34. Humidifier Controlled by Air Proving, Modulating Duct Mounted High Limit and Modulating Wall Mounted Space Controller . . . . . . . . . . . . . . . . . . . . . . . . 61 Figure 35. Humidifier Controlled by Air Proving, Modulating Duct Mounted High Limit and Modulating Wall Mounted Return Ai
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LIST OF TABLES Table Page 10-00 ELECTRODE STEAM ENGINEERING Table 1. Features Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 2. NHTC/NHPC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 10-10 HUMIDITY, STEAM ABSORPTION AND DISTRIBUTION Table 1. Outdoor/Indoor Relative Humidity Conversion Chart . . . . . . . . . . . . . . . . . . . . 14 Table 2. Load Calculation Summary Sheet . . . .
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Table Page Table 13. Modulating Demand Signal By Others Single Channel. . . . . . . . . . . . . . . . . . . 113 Table 14. Modulating Demand Signal By Others Dual Channel . . . . . . . . . . . . . . . . . . . . 113 Table 15. Modulating By Other Transducer Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Table 16. NORTEC OnLine Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 Table 17. NORTEC Links Options . . . . . . . . . . . . . .
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10-00 INTRODUCTION 10-00 Page 1 2008-10-01
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Figure 1. NHTC 10-00 Page 2 2008-10-01
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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 humidifi
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(6) As the water is boiled away, the minerals left behind increase the conductivity of the water in the cylinder. As soon as the conductivity is greater than design, the Ta to boil from A to D will be shorter than To and a drain cycle is initiated. (7) The fill valve always opens during timer drains, adding cold water to mix with the hot water from the cylinder during automatic drain cycles. This tempering process is required to meet plumbing codes. (8) As can be seen from a typical s
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Figure 2. Optimum Boiling Time Figure 3. Conductivity 10-00 Page 5 2008-10-01
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B. NH CAPACITY ADJUSTMENT (1) Each NORTEC NH Series humidifier is rated at its maximum output capacity. By means of the alphanumeric display and keypad on the NHTC/NHPC, the humidifiers can be adjusted to obtain an output between 20% and 100% of its rated capacity. C. DRAIN CYCLE AND CYLINDER LIFE (1) Water Type Used (Potable or Softened) (a) The electrode steam product line is one of the most efficient humidifier systems since it uses the minerals in the water to conduct electricity
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0. Store previous cycle’s drain decision in integral (l) memory. 1. Fill to A trigger (use all places below 1-10). 2. Boil to C trigger without timing to allow previous fill water to mix thoroughly during boiling. 3. Boil from C to D while monitoring time (T actual). 4. Decide how long (how much) to drain, then fill to B. 5. Drain according to the P+I calculated drain time, fill on to control outlet temperature. 6. At D, stop draining and postpone remaining drain, fill to B. 7. Contin
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It is important to note that the drain rate shown includes the make-up water, mixed with the drain water, which tempers the drain water to 140°F (60°C) or less. NOTE The electrode steam process provides optimum efficiency because all resistance to current passage is converted to usable energy. Unlike cal-rod or infrared humidifiers which convert some of their capacities into unusable heat. Figure 5. Capacity Setting & Cylinder Life Figure 6. Ou
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3. PRE-INSTALLATION EQUIPMENT VERIFICATION A. GENERAL (1) Ensure the available voltage and phase correspond with humidifier voltage and phase as indicated on the humidifier’s specification label. (2) Ensure that the external fuse disconnect is sufficient size to handle the rated amperage as indicated on the humidifier’s specifications label. Refer to local building codes. (3) Report any discrepancy immediately to the site engineer. (4) Location and mounting is described in Chapte
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Figure 6. Typical NHRS Installation (Sheet 1 of 2) 10-00 Page 10 2008-10-01
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Figure 7. Typical NHRS Installation (Sheet 2 of 2) 10-00 Page 11 2008-10-01
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10-10 HUMIDITY, STEAM ABSORPTION AND DISTRIBUTION 10-10 Page 12 2008-10-01
