Nortec MH Series Engineering Manual

Evaporative humidifier/air cooler

Hide thumbs Also See for MH Series:

Installation manual (40 pages)

Brochure (8 pages)

Installation manual (60 pages)

Table Of Contents

Table of Contents

Quick Links

Need help?

Do you have a question about the MH Series and is the answer not in the manual?

Questions and answers

NABIL A MOUSSA

February 6, 2025

NORTEC steam humidifier Model NH-030 Water and drain connection details

Summary of Contents for Nortec MH Series

Page 1 Your guide to selecting and specifying Nortec evaporative humidifiers / air coolers Series Engineering Manual Includes technical specifications, guidelines, and options for selection and application of MHTC / MHB Evaporative humidifiers / air coolers 2558982-D | 24 OCT 2011...
Page 2 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 liability for installations of humidity equipment installed by unqualified personnel or the use of parts/components/equipment that are not authorized or approved by Nortec.
Page 3: Table Of Contents
MHTC/ MHB Controls MH Components Control Wiring MH Specifications and Nortec Controls Dimensions 13 Specifying the MH Control Location Nortec Links XPS (MHTC Only) MH Specification Checklist 44 Warranty MH Model Duct Module Size Number of Stages Media Boxes Thickness Humidification Load...
Page 4: The Mhtc/Mhb Evaporative Humidifier / Air Cooler
MH requires inlet air that is warm and dry for most efficient operation. MH Media One of the most unique features of all MH series humidifiers / air coolers is their patented synthetic v-profile evaporative media which does not break down over time and release microscopic fibers which could be a health hazard.
Page 5: Humidification / Cooling
 During operation the controller responds to changes in demand by opening and closing staging valves. This allows the MH to match its output to demand. The Nortec MHTC / MHB | 2...
Page 6 In order to wash minerals from and prolong media life the MH includes a wash cycle which turns on all staging valves regardless of demand or control status and rinses the media. 3 | The Nortec MHTC / MHB...
Page 7: Mh Models
Each MH model is coupled with a duct module that contains the evaporative media used for humidifying / cooling the duct air. The duct module is basically the same for each model with the exception of the number of spray bars which are used for staging output. The Nortec MHTC / MHB | 4...
Page 8 MHB for factory configuration only.) Software Drain Button Outside Control Box (Initiates a software controlled drain) Status LEDs Lights On/Off Switch (Turns humidifier On/Off) Figure 4: MHTC and MHB User Interfaces 5 | The Nortec MHTC / MHB...
Page 9: Mh Humidifier Features
Manual capacity adjustment On/Off operation Compatible with all standard Industrial controls Option Option BMS (Lonworks, BACnet, Johnson, Modbus) Other UL900 Class 1 Flame and Smoke USA ULC-S111-07 Class 2 Flame and Smoke Canada The Nortec MHTC / MHB | 6...
Page 10: Mh Components
Manifold Light Relay Transformer Conductivity Fill Transmitter Valve Low Voltage Terminal Check Block Valve (Hydraulic Float Unit ) Pump Conductivity Sensor UV Light Drain Outlet Reservoir Drain Valve Figure 5: MH Humidifier Components 7 | The Nortec MHTC / MHB...
Page 11 UV Light Eliminates any bacteria in the water being pumped to the media boxes. Water Lines Supply water lines from hydraulic unit to spray bars. The Nortec MHTC / MHB | 8...
Page 12: Mh Specifications And Dimensions
6.2 in. 15.6 cm 16.7 in. 4 x 5/16 in O 42.5 cm (8 mm) 12.0 in. 14.3 in. 30.5 cm 36.3 cm 17.5 in. 44.4 cm Figure 6: MHTC Reflow/Flow Control Box Dimensions 9 | The Nortec MHTC / MHB...
Page 13 W/2 - 0.6 in. 1.6 cm 0.6 cm (W/2 - 1.6 cm) 15.8 in. 16.6 in. 40.2 cm 42.3 cm W = 24 - 144 in. (0.6 - 3.6 m) Figure 8: MH Duct Module Dimensions The Nortec MHTC / MHB | 10...
Page 14: Dimensions
3.33 2.55 25.07 11.88 30.16 1.32 Drain 2 x Water Tight 3.36 1/2 in. NPT Strain Relief Electrical Connection Water Inlet 1/2 in. NPT Figure 10: MHTC Flow/MHB Multi Stage Hydraulic Unit Dimensions 11 | The Nortec MHTC / MHB...
Page 15 1.8 in. Hose Barb 4.4 cm 4.3 in. 2 x 0.3 in. O 10.9 cm (7.6 mm) Water Inlet 2.7 in. 3/4 in GHT 6.8 cm Figure 11: MHB Single Stage Hydraulic Unit The Nortec MHTC / MHB | 12...
Page 16: Specifying The Mh
Example: Makeup Air System Required Media Box Thickness for Humidification 19 Specifying for Air Cooling Direct Air Cooling Indirect Air Cooling 21 MH Controls 21 MH Series Options and Accessories 24 Sample Specification 13 | Specifying the MH Humidifier / Air Cooler...
Page 17: Mh Specification Checklist
MH Specification Checklist The following checklist can be used to specify the MH Series Humidifier / Air Cooler. A description of each selection is provided later on in this section. Unit Tag: _______________ Zone _______________ Location or Elevation MH Model ...
Page 18: Mh Model
MH Model The decision of which MH model to use depends primarily on the application, the need for advanced control capabilities, and the need to minimize water usage. Table 4 provides an overview of the items to consider when selecting the MH Model for your application. Table 4: MH Model Selection MH Model MHTC Reflow...
Page 19 Note:.  See Required Media Box Thickness for Humidification on page 18 for an explanation of how to determine the required media box thickness for humidification.  See Example Direct Cooling on page 19 for an explanation of how to determine the required media box thickness for air cooling applications..
Page 20: Humidification Load
Specifying for Humidification Humidification Load Although Nortec’s Humidifier Engineering and Load-sizing Program (HELP) does not currently allow selection of MH technology the Atomizing Nozzle selection can be used to calculate the humidification load. Figure 13: Mixed Air System Humidity Load shows a schematic from HELP calculating the load for an application in Chicago.
Page 21 Chicago Illinois Makeup Air System Calculated Load = 1723 lb/hr Figure 14: Makeup Air System Humidity Load A) Outdoor Air = -1 ºF (-18 ºC) 53% RH B) Preheated Air (before humidification) = 90 ºF (32 ºC) 1% RH C) After humidification = 54 ºF (12 ºC) 91% D) Room Design = 72 ºF (22 ºC) 50% RH Based on these conditions the HELP software calculates a humidification load of 1723 lb/hr.
Page 22: Specifying For Air Cooling
Specifying for Air Cooling Direct Air Cooling Direct air cooling is normally used to cool the makeup air in an air handling system because trying to cool return air which has a high RH due to previously being cooled is not very effective. The easiest way to determine the maximum cooling which can be achieved is to calculate the maximum effectiveness of the MH and then use a psychrometric chart to determine end conditions.
Page 23 4 Calculate the Maximum Cooling = (outdoor dry bulb– outdoor Wet bulb) x Max effectiveness Max Cooling 12 in. (30 cm) Media = (88.9ºF – 61.6ºF) x 94% = 25.7 ºF Max. Cooling 8 in. (20 cm) Media = (88.9ºF – 61.6ºF) x 84% = 22.9 ºF 5 Calculate the conditions of the air leaving the MH duct module by subtracting the maximum cooling from the supply dry bulb temperature and by using the psychrometric chart.
Page 24: Mh Controls
On/Off Dry Contact 24 VAC Dry Contact 24 VAC MHTC control signal type can be configured by Nortec at the factory or can be user configured. Configuration is done with the MHTC’sLCD and keypad. MH Series Options and Accessories Nortec provides a complete line of options and accessories for every humidification application.
Page 25 Outdoor Temperature Sensor The outdoor temperature sensor is used in conjunction with Nortec’s Digital humidistats to provide a humidity setpoint reset when outdoor temperature is very low. The setpoint is reduced to prevent condensation on windows and other parts of a buildings structure.
Page 26: Accessories
Nortec Links XPS for MHTC, LONWORKS Nortec Links XPS for MHTC, N2 (Consult Factory) (See Nortec Links XPS (Optional MHTC Only)on page 41) Double Check Valve The MHTC models include a check valve in their hydraulic units to prevent back flow to the supply water system. The double check valve can be used as additional protection or on the MHB model.
Page 27: Sample Specification
Sample Specification PART 1 - GENERAL 1.1 WORK INCLUDED A. NORTEC In-duct/AHU Evaporative Humidifier / Cooler, MH Series humidifier[s] as indicated on drawing[s] and as indicated on schedule[s]. B. Complete and operable humidification/cooling system [which is designed to meet applicable building codes].
Page 28 The V-Profile ensures a more efficient evaporation by improving the exchange between air and water. 4. The MH series uses an intuitive electronic controller, which monitors the operation of the system, controls output levels and initiates self-cleaning flushing cycles to ensure hygiene and a long life span of the media.
Page 29 2. The V-profile of the humidifier box guides air flow over the complete surface of the media which promotes efficient evaporation and ensures low pressure loss. 3. The material has a flame retardant coating and fire protection is in compliance with UL 900 Class 1 Flame and Smoke.
Page 30 0-10Vdc, 0-5Vdc, 1-5Vdc, 2-10Vdc, 0-16Vdc, 0-20mA, or 4-20mA control signal c) On/Off 24 Vac safety loop for On/Off control, air proving or high limit d) Accepts Nortec Humidity Sensors or Controllers or Controls by others via DDC or BMS.
Page 31 10. P/N 1509858 - 2-10V Dig Wall Humidity Sensor 11. P/N 1509857 - 2-10V Duct Humidity Sensor 12. Nortec LINKS2 and Nortec Online please consult factory H. Standard of acceptance: Nortec MH Series Evaporative Humidifier / Cooler. PART 3 - EXECUTION 3.1 EXAMINATION A.
Page 32: Mh Installation Requirements
Outdoor Temperature Reset Control Acceptance Configured at Factory Control Location Control Wiring 41 Nortec Links XPS (Optional MHTC Only) NOTE: The following sections provide an outline of the installation requirements. For detailed installation instructions refer to MH Series Installation and Operation Manual.
Page 33  Clearance dimensions shown are for reference only and are the minimum required for maintenance. Consult local and national codes before final location and installation. Nortec does not accept responsibility for installation code violations.
Page 34 Note:  A P-Trap equal to duct static pressure plus 2 inches must be installed on the drain pan overflow. Insure sufficient space is available. Use a stand to raise the drain pan in the duct if necessary.  The Duct Module requires regular maintenance including replacement of media boxes.
Page 35 Plumbing  All water supply and drain line connections must be installed in accordance with local plumbing codes.  Install water shut off valve and union before humidifier to facilitate servicing.  P Trap is required on the drain of the MHTC Flow / MHB and on the overflow of the MHTC Reflow.
Page 36 Spray bar Elbow(s) Spray Bar Lines 1/2 in (13 mm) OD tube. 1/2 in.(13 mm) ID EPDM hose or better. Cut to required length. Connect staging valve(s) to spray barb elbows with hose (by others). Water Inlet 3/4 in. BSP (1/2 in.
Page 37 Electrical Note: All MH models operate on 120 VAC, single phase, 60 HZ power. Refer to specification label for power requirements. Note: Dedicated external fused disconnect must be installed. MHPrimary Power Fusing must not exceed max 120 VAC circuit protection as indicated Single Phase Supply on the specification label.
Page 38 MHTC/ MHB Controls Humidification controls are available from Nortec as accessories or can be supplied by others. Temperature controls for cooling applications are not available from Nortec and must be supplied by others. The following information is relevant to all controls, factory supplied or otherwise.
Page 39 Note: Regardless of selecting On/Off or modulating control method, Nortec humidifiers must have a closed circuit across their On/Off security loop control terminal to operate. Nortec highly recommends the use of a high limit humidistat and an air proving switch in series for this function.
Page 40 2520266 - Digital Duct Humidistat Package 2520261 - Digital Wall W/O Sensor 1509858 - Wall Sensor Figure 23: Nortec Modulating Humidistats Humidity Transducers Transducer send RH signals back to either a controller or back to the MH. The MHTC not the MHB can accept a direct transducer signal.
Page 41 The outdoor temperature sensor is used to prevent condensation on windows or other surfaces that are adjacent to outdoor air. This sensor can be used in conjunction with the Nortec digital On/Off and modulating controllers. The sensor allows the controller to override the set point to prevent the humidifier from humidifying when condensation could be possible (see Figure 25).
Page 42: Control Location
Note: Regardless of selecting on/off or modulating control method, The MH must have a closed circuit across its On/Off security loop control terminal to operate. Nortec highly recommends the use of an air proving switch for this function. 39 | MH Installation Requirements...
Page 43 Control wiring The MHTC control terminal strip is shown in Figure 28 along with a brief description of each of the inputs/outputs. The figure also shows the MHTC remote relay board. For wiring use minimum of 18 AWG and keep as short as possible. MHTC Control Terminal Strip 24 VAC power output for safety loop and On/Off controls 24 VAC...
Page 44: Nortec Links Xps (Mhtc Only)
Nortec Links XPS (Optional MHTC Only) Nortec LINKS XPS is an option that can be integrated with the MHTC. It allows a Building Management System to monitor and / or control the humidifier. See Nortec publication Links XPS MHTC Installation and Operation Manual for detailed information about Nortec LINKS XPS and its operation and configuration.
Page 45 MH Installation Requirements | 42...
Page 46 43 | Warranty...
Page 47: Warranty
Warranty Walter Meier Inc. and/or Walter Meier Ltd. (hereinafter collectively referred to as THE COMPANY), warrant for a period of two years after installation or 30 months from manufacturer’s ship date, whichever date is earlier, that THE COMPANY’s manufactured and assembled products, not otherwise expressly warranted (with the exception of the media), are free from defects in material and workmanship.
Page 48 U.S.A. Walter Meier (Climate USA) Inc. 826 Proctor Avenue Ogdensburg, NY 13669 CANADA Walter Meier (Climate Canada) Ltd. 2740 Fenton Road Ottawa, Ontario K1T 3T7 TEL: 1.866.NORTEC1 FAX: 613.822.7964 EMAIL: nortec@waltermeier.com WEBSITE: www.humidity.com...

This manual is also suitable for:

Mhtc reflow Mhtc flow Mhb

Nortec MH Series Engineering Manual

Specifying the MH

MH Installation Requirements

Warranty