Nortec MH Series, Engineering Manual

Page 1: ...udes technical specifications guidelines and options for selection and application of MHTC MHB Evaporative humidifiers air coolers 2558982 D 24 OCT 2011 Your guide to selecting and specifying Nortec evaporative humidifiers air coolers ...

Page 2: ...tion 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...

Page 3: ...klist 15 MH Model 15 Duct Module Size 15 Number of Stages 15 Media Boxes Thickness 17 Humidification Load 19 Specifying for Air Cooling 21 MH Controls 21 MH Series Options and Accessories 24 Sample Specification 29 MH Installation Requirements 30 Location Duct Module 31 Location MHTC Reflow Hydraulic Unit 32 Plumbing 34 Electrical 35 MHTC MHB Controls 39 Control Wiring 36 Nortec Controls 39 Contro...

Page 4: ...perature control Since the MH depends on the energy in the air passing through the evaporative media to evaporate water the 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...

Page 5: ...ir passing through the media As a result of the evaporation the humidity of the air is increased and the temperature of the air is decreased Any water that is not evaporated collects in the drain pan and MHTC Reflow flows back to the hydraulic unit reservoir to be recirculated As water is evaporated the water level in the reservoir decreases and the float opens The MH then refills until the float ...

Page 6: ... requires optional conductivity sensor Flushes the tank when the conductivity sensor indicates the concentration of minerals exceeds a configured maximum value In general more frequent drains result in less maintenance The amount of water drained to control mineral concentration in the recirculating water can be configured in the MHTC s software Pressure Equalization Line MHTC Reflow only In order...

Page 7: ...low provides the same state of the art control technology including staging of output to match demand but without the hydraulic unit for recirculating water MHB provides basic operation without any user configurable features Figure 3 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 s...

Page 8: ...he main difference between the MHTC Flow and the MHB model is in their controls and user interface The MHTC model s Total Controller provides a graphic LCD screen and keypad accepts additional control signals and has optional building management system connectivity BACnet Lonworks Johnson N2 and Modbus The MHB controls provide the basic functionality required for operation See Table 1 MHTC Reflow ...

Page 9: ...s General MHTC Reflow MHTC Flow MHB Patented synthetic V profile evaporative media X X X Stainless steel duct media box frames and drain pan X X X Operates on DI RO Potable Softened Water X X X Optional low pressure drop mist eliminator Optional Optional Optional Recirculating water system X Direct water system X X Wash cycles and box drying Configurable Configurable Factory Set Step Control 1 2 o...

Page 10: ...Seal Mist Eliminator Intermediate Member Drain Pan Water Lines Pressure Equalization Line Drain Overflow Hydraulic Unit Drain Pan Drain Control Box Conductivity Sensor Float Check Valve Fill Valve Staging Manifold Staging Valve Pressure Equalization Line Pump UV Light Reservoir Drain Valve Fuse Block Pump and UV Light Relay Transformer Conductivity Transmitter Low Voltage Terminal Block Hydraulic ...

Page 11: ...ate Member Structural member supports media boxes Low Voltage Terminal Block Hydraulic Unit connects control box inputs to the hydraulic unit Control Box provides connection for control signals and safety loop Media Boxes Surface from which water is evaporated for humidification cooling Available in 8 in 20 cm or 12 in 30 cm thickness Mist Eliminator Captures any water droplets that are carried of...

Page 12: ...Control accuracy Depends on air conditions number of stages and control setup Supply water pressure 30 145 psi 2 10 Bar Supply water temperature 41 113 ºF 5 45 ºC Water quality Tap water reverse osmosis softened or fully demineralized water Max allowable air velocity through media 750 fpm 3 8 m s 1100 fpm 5 5 m s with mist eliminator Pressure drop Typically 0 44 IWC 250 Pa 500 fpm 2 5 m s and 90 R...

Page 13: ... in 10 3 cm H 24 144 in 0 6 3 7 m 12 in 30 cm Supplied Cut to Desired Length 16 6 in 42 3 cm 0 6 in 1 6 cm W 1 2 in W 3 2 cm W 2 0 6 in W 2 1 6 cm 15 8 in 40 2 cm W 24 144 in 0 6 3 6 m O 0 2 in 0 6 cm 6 X Overflow 2 in 50 8 mm Tube Drain 2 0 in 50 8 mm Tube 1 3 x Spray Bar 1 2 in 12 7 mm Tube 9 3 in 23 6 cm 6 0 in 15 2 cm 10 75 in 27 3 cm 11 5 in 29 2 cm 5 4 in 13 6 cm 4 x 0 31 in O 8 mm ...

Page 14: ...in 29 2 cm 2 0 in 5 1 cm 2 0 in 5 2 cm 10 0 in 25 5 cm 2 5 in 6 4 cm Water Inlet 3 4 in BSP 1 2 in NPT Adapter provided Drain Pan Connection 2 in Tube Drain 2 in ID Hose Spray Bar Connections 1 3 x 1 2 in 13 mm Hose Barb Press Equal 1 2 in 13 mm Hose Barb Electrical 3 x 7 8 in 22 mm 24 1 in 61 3 cm 11 87 30 15 8 05 20 45 9 87 25 07 1 00 2 55 11 88 30 16 1 32 3 36 1 31 3 33 1 3 x 1 2 in OD Barbed H...

Page 15: ...The Nortec MHTC MHB 12 Figure 11 MHB Single Stage Hydraulic Unit 1 8 in 4 4 cm 2 7 in 6 8 cm 4 3 in 10 9 cm Water Inlet 3 4 in GHT Spray Bar Connection 1 2 in 13 mm Hose Barb 2 x 0 3 in O 7 6 mm ...

Page 16: ...er of Stages 15 Media Boxes Thickness 17 Specifying for Humidification 17 Humidification Load 17 Example Mixed Air System 17 Example Makeup Air System 18 Required Media Box Thickness for Humidification 19 Specifying for Air Cooling 19 Direct Air Cooling 20 Indirect Air Cooling 21 MH Controls 21 MH Series Options and Accessories 24 Sample Specification ...

Page 17: ...Air After Humidification Temp RH Required Effectiveness Air Cooling Air Before Cooling DB Temp WB Temp Air After Cooling DB Temp Required Effectiveness Media Box Thickness Duct Velocity 8 in 20 cm Eff 12 in 30 cm Eff Use 8 in 20 cm Media Use 12 in 30 cm Media Control Humidity Demand Transducer On Off Signal Type _______ By Others By Nortec Part No_______________ or Temperature Demand On Off By Oth...

Page 18: ... Module Dimensions for duct module dimensions To provide installation clearance the duct width should be at least 1 5 in 38 mm wider and 0 5 in 13 mm taller than the specified duct module Max Module Unit Width Duct Width 1 5 in 38 mm Max Module Unit Height Duct Height 0 5 in 13 mm Number of Stages Staging provides a means for the MH unit to match its output to demand and is primarily used in humid...

Page 19: ...ciency 12 in 30 cm Media 8 in 20 cm Media 500 fpm 2 5 m s 500 94 at 500 fpm 84 at 500 fpm 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: ...r system room design conditions of 72ºF 50 RH Air Volume of 50 000 cfm makeup air volume of 7 500 cfm 10 x 10 ft duct Figure 13 Mixed Air System Humidity Load A Outdoor Air 1 ºF 18 ºC 53 RH 7 500 cfm B Return air Room Design 72 ºF 22 ºC 50 RH 42 500 cfm C Mixed Air Outdoor Air Return Air 61 ºF 16 ºC 63 RH 50 000 cfm D Preheated Air before humidification 90 ºF 32 ºC 24 RH E After Humidification 85 ...

Page 21: ...sufficient and should be used because of its lower pressure drop and lower cost For the examples above 1 Calculate the required effectiveness Mixed Air System Required Effectiveness RH after RH before 100 RH before 33 24 100 24 12 Makeup Air System Required Effectiveness RH after RH before 100 RH before 91 1 100 1 91 2 Calculate the air velocity V 50 000 cfm 10 ft x 10 ft 500 fpm 3 Use Figure 12 M...

Page 22: ...k media Los Angeles California Air volume 50 000 cfm Duct size 10 x 10 ft Figure 15 Figure 15 Direct Cooling Los Angeles 1 Calculate the Air Velocity V 50 000 cfm 10 ft x 10 ft 500 fpm 2 Determine the maximum effectiveness Use Figure 12 Maximum MH Effectiveness vs Air Velocity along with the calculated velocity to determine maximum effectiveness of each media 12 in 30 cm Media 94 8 in 20 cm Media ...

Page 23: ...ted The maximum cooling that can be achieved depends on the efficiency of the heat exchanger the maximum effectiveness of the MH and the outside air conditions Supply DB DB Primary DB Primary DB Secondary x Heat Exchanger Efficiency Where DB Secondary DB Outdoor DB Outdoor WB Outdoor x MH Effectiveness Example Indirect Air Cooling If the air stream in the direct cooling example above is used to co...

Page 24: ...n 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 Table 6 Options and Accessories lists options available for the MH Series with a brief description of their function Table 6 Options and Accessories Option Accessory Used For Mist Eliminator Mist eliminators are available for all ...

Page 25: ... either controlling humidity or for high limit control Modulating humidistats can only be used with MHTC models not MHB See Modulating Humidistats on page 36 Humidity Transducers Digital Humidity Transducers communicate RH in a space or duct to the humidifier When used with an MHTC not MHB the humidifier displays the sensed RH on its LCD display screen setpoints are entered using the humidifier ke...

Page 26: ...n N2 or Modbus building management systems A separate part number must be selected to specify the type of building management system MHTC only Nortec Links XPS for MHTC BACNET IP Nortec Links XPS for MHTC BACNET MSTP 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 v...

Page 27: ...nd marked for intended use C Comply with ARI 640 Standard for Commercial and Industrial Humidifiers D Products shall be supported with a warranty that ensures the product will be free from defects in materials and workmanship for a period of two years after shipment Excluding the media boxes as they are a serviceable item whose effective operation life depends on the water quality and air filtrati...

Page 28: ...ing systems or ductwork Air downstream of humidifier is free of aerosols cooler and more humid 2 Humidifier shall accept potable softened reverse osmosis and de ionized water 3 The packaged humidifier is designed around the patented UL 900 Class 1 V Profile humidification boxes which uses impregnated polyester as the humidifying medium The V Profile ensures a more efficient evaporation by improvin...

Page 29: ...trol MHTC models only using a proportional integral method for interpreting analog signals from a humidistat and or the building control systems 2 The controller MHTC models only determines which stages should be activated to meet humidification loads The controller activates self maintenance cycles This includes controlled flushing of the water tank in conjunction with filling cycles and schedule...

Page 30: ...d water inlet valve with a BSPP connection shall operated between 30 80 psi operating pressure 7 Level control float for indication to control electronics when water tank is full and when tank needs to be refilled then 8 Drain connection is a 1 25 3 175 cm ID 9 Overflow protection in case of a level control or fill valve failure allows water to flow directly to drain F Aerosol Breakdown and Hygien...

Page 31: ...nce 3 3 TESTING A Manufacturer s Field Service Engage a factory authorized service representative to inspect field assembled components and equipment installation including piping and electrical connections Report results in writing 1 Leak Test After installation charge system and test for leaks Repair leaks and retest until no leaks exist 2 Operational Test After electrical circuitry has been ene...

Page 32: ... 36 On Off Controls 36 Modulating Humidistats 37 Humidity Transducers 38 Outdoor Temperature Reset 38 Control Acceptance Configured at Factory 39 Control Location 39 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: ...s Air filters meeting ASHRAE 52 2 MERV 8 or 11 must be installed upstream of the MH Ensure access door and space for replacing media boxes is provided downstream of the MH duct module If installed provide extra space for opening mist eliminator to access media In case the outside of the duct or air handler walls are in contact with low ambient temperature insulate the outside of the duct to preven...

Page 34: ...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 Ensure access and sufficient space is provided downstream of the unit to remove and install new media boxes 2 in 5 cm 10 in ...

Page 35: ...re provided over size so they can be cut down to required length High hardness supply water will require increased maintenance and more frequent replacement of evaporative media Unit damage caused by water quality outside of the specified ranges is not covered under warranty Figure 19 MHTC Flow MHB Plumbing Installation Note Supply untreated potable water reverse osmosis water fully demineralised ...

Page 36: ...in 32 mm ID min Maintain slope P Trap 6 in 15 cm min or duct static pressure 2 in whichever is greater Overflow Use 2 in 51 mm ID hose cuff provided Pressure Equalization Line 3 8 in 9 5 mm ID hose Connect to nipple on reservoir and to port in duct wall by others downstream of duct module Spray Bar Lines 1 2 in 13 mm ID EPDM hose or better Connect staging valve s to spray barb elbows with hose by ...

Page 37: ...icated on the specification label Ensure that adequate power is available to carry full MH amp draw as indicated on the specification label All wiring must be in accordance with national and local electrical codes For MHTC Reflow and Flow wire hydraulic unit as shown L1 Neutral Ground L1 Neutral Ground 120 VAC Single Phase Supply E X T I N T Dedicated circuit breaker or fused disconect High voltag...

Page 38: ...a its LCD and keypad Both the MHTC and the MHB include a 24 VAC safety input which must be made in order for the humidifiers to operate and which is used for controlling On Off operation The MH humidifier can be configured to operate with the following control configurations Table 7 Humidifier Control Configurations Configurations MHTC MHB Single Channel Modulating Demand On Off Safety 0 5 1 5 0 1...

Page 39: ...rating range of 0 95 RH closes on humidity drop and opens on rise Wall Mounted Digital Humidistat On Off control based on setpoint adjustable set point from 15 90 RH with accuracy fixed at 3 at 25 C operating range of 0 95 RH closes on humidity drop and opens on rise On Off Controls Supplied by Others Can be used as long as they have a dry set of contacts capable of passing a 24 VAC 2 A maximum si...

Page 40: ...et point from 15 90 RH with accuracy fixed at 3 at 25 C outputs a 0 10 VDC signal 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 The sensors include Wall Mounted Humidity Transducer Sensor output of 2 10 VDC range of 0 to 95 RH Duct Mounted Humidity Tran...

Page 41: ... Figure 25 Outdoor Temperature Reset Figure 26 Outdoor Temperature Sensor Control Acceptance Configured at Factory Nortec offers factory configuration of controls to match those that will be used at site Factory configuration eliminates the need to configure the MHTC in the field and makes it plug and play with respect to software configuration Table 8 Factory Configured Control Acceptance Part Nu...

Page 42: ... air duct preferred or in room being humidified cooled Mount in area representative of room humidity temperature draft doorways sunlight or overhang such as a shelf can affect reading Avoid placing near discharge diffuser of humidified cooled air 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 op...

Page 43: ...On Off controls On Off input safety loop and On Off controls Ground reference for control signals Control input demand or transducer Not used 5 VDC reference voltage Ground MHTC Control Terminal Strip Steam Unit ON Error Service NO COM NO COM NO COM NC NO COM NC Remote Relay Board Not present with Links XPS E X T M H E X T M H Stage 1 Stage 2 Stage 3 Ground 24 VDC Level Sensor Fill Valve Drain Val...

Page 44: ...S and its operation and configuration Table 9 Nortec Links XPS Recommended Wire Types and Lengths Protocol Signal Type Polarity Recmended Cable Max Recommended Distance from Nortec Module A B BACnet MSTP EIA 485 2 wire Net Net 18 24 AWG Shielded Twisted Pair 2000 ft at 9 600 bps 2000 ft at 38 400 kbps Johnson N2 BACnet IP LAN Standard N A N A CAT 5E cable with RJ 45 termination Depends on cable ma...

Page 45: ...MH Installation Requirements 42 ...

Page 46: ...43 Warranty ...

Page 47: ...hatsoever shall be attached to THE COMPANY until said products have been paid for in full and then said liability shall be limited to the original purchase price for the product Any further warranty must be in writing signed by an officer of THE COMPANY THE COMPANY s limited warranty on accessories not of the companies manufacture such as controls humidistats pumps etc is limited to the warranty o...

Page 48: ...limate 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 ...