Nortec MH Series User Manual

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MH Series

Installation and Operation Manual

Includes installation, operation, maintenance and troubleshooting information for your MHTC / MHB Adiabatic Air Humidifier

2544832-D | 04 OCT 2011

Thank you for choosing Nortec.

INSTALLATION DATE (MM/DD/YYYY)

MODEL #

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 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.

Contents

1 Introduction

1 Limitation

1 Safekeeping

2 Safety

5 Product Overview

5 Model Overview

5 Product Designation

7 MH Flow & Reflow – Construction Model & System Overview

15 Standard Delivery, Storing, Transport, Packaging

16 Mounting and Installation

16 Unit Mounting

18 Mounting Process

31 Plumbing

31 Plumbing Overview

32 Water Supply

32 Water Quality

33 Water Drain

33 Electrical

34 Mounting the MH Control Unit

35 MH Series – Flow Wiring Diagram

36 MH Series – ReFlow Wiring Diagram

37 Operation

37 Putting into Operation

38 Adjusting the Volume Controlling Valves

39 Taking Out of Operation

39 Maintenance

40 Maintenance Intervals

41 Maintenance List

42 Dismantling and Installation Works

42 Dismantle and Install the Mist Eliminator and Humidification Boxes

43 Dismantle and Install the UV Lamp

43 Resetting the Maintenance Indication

44 Spare Parts

42 Troubleshooting

48 Taking Out of Service

49 Product Specifications

51 Unit Dimensions

Introduction

Thank you for purchasing the NORTEC MH Series adiabatic air humidifier.

The NORTEC MH adiabatic air humidifier incorporates the latest technical advances and is designed to meet all recognized safety standards. Improper use of the humidifier may result in danger to the user or third parties and/or damage of material assets.

To ensure safe, proper, and economical operation of the NORTEC MH Series adiabatic air humidifier, please observe and comply with all information and safety information contained in this manual as well as in any separate documentation related to the components installed in the humidification system.

If you have questions, which are not answered in this documentation, please contact your NORTEC representative, they will be glad to assist you.

Limitation

The product covered in this manual is solely the NORTEC MH Series adiabatic air humidifier. The various accessories associated with the humidifier are only described in such detail that is necessary for proper operation of the humidifier. Further information on accessories can be obtained in their respective manuals.

These instructions are restricted to the installation, commissioning, operation, servicing, and troubleshooting of the NORTEC MH Series adiabatic air humidifier and are meant for qualified personnel. The installation and operating instructions are supplemented by various separate items of documentation (manuals for accessories, etc.). Appropriate cross-references are made to these publications in the installation and operating instructions.

Safekeeping

Please keep with manual in a safe place, where it can be immediately accessed. If the equipment changes hands, the documentation must be passed on to the new operator.

If the documentation gets misplaced, please visit humidity.com or contact your NORTEC representative.

Safety

General

Every person working with the NORTEC MH Series must read and understood the installation and operating instructions before carrying out any work. Knowing and understanding the contents of the installation and operating instructions is a basic requirement for protecting all personnel against any kind of danger, to prevent faulty operation, and to operate the unit safely and correctly.

MH Series | 1

All signs and markings applied to the unit must be observed and kept in a readable state.

Qualification of Personnel

All work (installing, operating, servicing, etc.) described in this manual may only be carried out by a specialist who is well trained and adequately qualified and is authorized by the customer.

For safety and warranty reasons, any action beyond the scope of this manual, must be carried out only by qualified personnel authorized by the manufacturer.

It is assumed that all persons working with the NORTEC MH Series are familiar and comply with the appropriate regulations on work safety and the prevention of accidents.

Intended Use

The NORTEC MH Series adiabatic air humidifier/cooler is intended exclusively for air humidification/air cooling in air ducts or air handlers within the specified operating conditions.

Any other type of application, without the written consent of the manufacturer is considered as not conforming with the intended purpose and may lead to dangerous operation of the NORTEC MH Series.

Operation of the equipment in the intended manner requires that all the information in these instructions are observed (in particular the safety instructions).

2 | MH Series

Danger that May Arise From the Unit

Warning: Some components of the NORTEC MH Series are mains powered.

If the control unit or distribution boxes are open, live parts may be present. Touching live parts may cause severe injury or danger to life.

Prevention: Before starting any work, set the NORTEC MH Series out of operation, by switching off the unit, disconnecting it from the mains, and stop the water supply. Secure the unit against inadvertent power-up.

Warning: The UV lamp used in the water treatment unit (option) emits harmful UV-C rays.

If the UV lamp is operated outside the housing, the emitted UV-C rays may damage the eyes.

Prevention: Never operate the UV lamp outside the housing.

Warning: Badly maintained humidifiers can endanger health of building occupants.

If the unit is not properly maintained germs may grow in the humidifier and its components which can cause illness and may affect the air passing through the humidifier.

Prevention: The NORTEC MH Series must be cleaned in the intervals described in the maintenance section of this manual. Maintenance must be carried out correctly and the humidification boxes and the mist eliminator boxes must be replaced after their lifetime has elapsed.

MH Series | 3

In Case of Danger

If safe operation is no longer possible, then the NORTEC MH Series should immediately be shut down and secured against accidental power-up.

This can be the case under the following circumstances:

• If the NORTEC MH Series is damaged.

• If the NORTEC MH Series is no longer operating correctly.

• If connections and/or piping are not sealed.

• If electrical cables are defective.

Any alterations made to the NORTEC MH Series, that could affect safety, must be reported the owner without delay.

Prohibited Modifications to the Unit

No modifications should be made to the NORTEC MH Series without the express written consent of the manufacturer.

For the replacement of defective components only use accessories and spare parts available from your NORTEC supplier.

4 | MH Series

Product Overview

Model Overview

The NORTEC MH is available in the two base versions “Flow” with direct water system and “Reflow” with circulating water system. The following models are available:

• NORTEC MHB Flow (on/off control).

• NORTEC MHTC Flow (total control staging).

• NORTEC MHB Reflow (on/off control).

• NORTEC MHTC Reflow (total control staging).

All base models can be extended in their functions by different options. In addition there are different accessories available for all models.

Product Designation

The product designation and power requirements are found on the rating plate.

MH Series | 5

Figure 1: Type Key

6 | MH Series

MHB Flow - Construction Model

# Description

1 Water connection on unit r 3/4 " (outside thread)

2 Volume controlling valves (adjustable manually)

3 Water tub

4 Open drain 1.5” pvc (1.66” (42 mm) od)

5 Water hoses

6 Spray bar cap with distribution pipes

7 Humidification boxes

8 Mist eliminator (for air speed above humidification boxes >3.8 m/s) (750 fpm)

9 Control unit on/off

Figure 2: Construction Model – MHB Flow

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MHB Flow - System Overview

Figure 3: System Overview – MHB Flow

Functional Description

The MHB Flow model provides on/off control by means of the MHB control unit and an external on/off humidistat. In case of a humidification/cooling request the supply valve opens and the water flows via the pressure reducing valve (accessory), the water filter (accessory) and the manually adjustable volume controlling valves to the distribution pipes above the humidification boxes.

8 | MH Series

MHTC Flow - Construction Model

# Description

1 Water connection on unit r 3/4 " (outside thread)

2 Volume controlling valves (adjustable manually)

3 Step valves (1 to 3)

4 Water tub

5 Open drain (outside diameter 1.5" pvc (1.66" (42 mm) od)

6 Water hoses

7 Spray bar cap with distribution pipes

8 Humidification boxes

9 Mist eliminator (for air speed above humidification boxes >750 fpm) (3.8 m/s)

10 UV water treatment (option)

11 MHTC Total Control Unit

Figure 4: Construction Model – MHTC Flow

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MHTC Flow - System Overview

Figure 5: System Overview – MHTC Flow

Functional Description

The MHTC flow model provides multistep control by means of the MHTC total control unit and the step valves (1, 2 or 3 step valves depending on the humidifier capacity). The MHTC total control unit (for wall mounting) processes analog sensor/control signals and uses them to control the step valves. This allows multistep control (1 to 3 steps depending on the humidifier capacity) which improves control accuracy compared to the MHB Flow model.

In case of a humidification/cooling request one, two or all three step valves open (depending on the request). The water flows via the manually adjustable volume controlling valves to the distribution pipes above the humidification boxes.

The distribution pipes evenly supply the water to the entire surface of the humidification boxes where it flows down and humidifies the air flowing through the humidification boxes. The excess water not used for humidification flows to the water tub and then directly to the drain. If the MHTC Reflow model is equipped with the optional uv water treatment, all the water is led through the uv water treatment unit where it is sterilized before it is introduced to the humidifier boxes.

10 | MH Series

MHB Reflow - Construction Model

# Description

1 Water connection on unit r 3/4 " (outside thread)

2 Level-controlled supply valve

3 Circulation pump

4 Overflow

5 Drain

6 Drain valve

7 Volume controlling valves (adjustable manually)

8 Water tub

9 Water hoses

10 Spray bar caps with distribution pipes

11 Humidification boxes

12 Mist eliminator (for air speed above humidification boxes >750 fpm) (3.8 m/s)

13 MHB control unit

Figure 6: Construction Model – MHTC Flow

MH Series | 11

MHB Reflow - System Overview

Figure 7: System Overview – MHB Reflow

Functional Description

The water tub is filled up to a preset upper level via the level-controlled supply valve. When the water level in the tub drops below a certain limit, the level-controlled supply valve opens until the upper limit is reached again. The pump is activated whenever the float is high and continues to operate for a preset time after the float level drops.

The MHB Reflow model provides on/off control by means of the MHB control unit and an external on/off humidistat. In case of a humidification/cooling request the pump is activated. The water flows via the manually adjustable volume controlling valves to the distribution pipes above the humidification boxes.

The distribution pipes evenly supply the water to the entire surface of the humidification boxes where it flows down and humidifies the air flowing through the humidification boxes. The excess water not used for humidification flows to the water tub. To prevent accumulation of mineral residues and the formation of germs in the water tub, the tub is completely drained periodically (interval or time controlled).

12 | MH Series

MHTC Reflow - Construction Model

# Description

1 Water connection on unit r 3/4 " (outside thread)

2 Level-controlled supply valve

3 Circulation pump

4 Overflow

5 Drain

6 Drain valve

7 Step valves (1 to 3)

8 Volume controlling valves (adjustable manually)

9 Water tub

10 Water hoses

11 Spray bar cap with distribution pipes

12 Humidification boxes

13 Mist eliminator (for air speed above humidification boxes >750 fpm) (3.8 m/s)

14 UV water treatment (option)

15 MHTC total control unit

Figure 8: Construction Model – MHTC Flow

MH Series | 13

MHTC Reflow System Overview

Figure 9: System Overview – MHTC Reflow

Functional Description

The MHTC Reflow model provides multistep control by means of the MHTC total control unit and the step valves (1, 2 or 3 step valves depending on the humidifier capacity). The MHTC total control unit (for wall mounting) processes analog sensor/control signals and uses them to control the step valves. This allows multistep control (1 to 3 steps depending on the humidifier capacity) which improves control accuracy compared to the MHB Reflow model.

In case of a humidification/cooling request, the circulation pump starts and one, two, or all three step valves open (depending on the request). The water flows via the manually adjustable volume controlling valves to the distribution pipes above the humidification boxes. The distribution pipes evenly supply the water to the entire surface of the humidification boxes where it flows down and humidifies the air flowing through the humidification boxes. The excess water not used for humidification flows to the water tub.

14 | MH Series

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Nortec MH Series User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual