Nortec Industries MES-U User's Manual
Contents
1. Nortec csv Electrode www humidity com Steam Humidifiers Installation Operation Maintenance Spare Parts and Exploded Views Guide IMPORTANT Read and save this guide for future reference This guide to be left with equipment owner Form 03 111 Rev 1 Table of Contents INSTALLATION RECEIVING EQUIPMENT PRINCIPAL OF OPERATION WATER SUPPLY AND PLUMBING WATER CONNECTION START UP AND OPERATION CAPACITY ADJUSTMENT CYLINDER REPLACEMENT ME WHEN TO REPLACE THE STEAM CYLINDER REMOVING THE OLD CYLINDER INSTALLING THE NEW CYLINDER MAINTENANCE EXTENDED SHUTDOWN TROUBLESHOOTING TERMS USED STARTING POINT gt poi PHYSICAL DIMENSIONS DIAGRAM WIRING DIAGRAM SPARE PARTS LIST EXPLODED VIEWS DIAGRAM CO ON oO A A A A KOW ON NN INSTALLATION RECEIVING EQUIPMENT 1 Check packing slip to ensure ALL material has been received 2 Inspect box for damage and note on shipping waybill accordingly 3 After unpacking inspect unit for damage and if damage is found advise shipper as soon as possible 4 Inspect unit humidifier to ensure it is the correct model phase and voltage If any are incorrect advise the factory or your local representative immediately NOTE All products are shipped on an F O B factory basis Any and all damage loss or breakage claims are to be made directly to the shipping company2. The NORTEC MES U electrode humidifier is the culmination of many years of research and development in the electrode humidifier industry This unit has been built by skilled craftspeople and thoroughly tested before shipment and should if the following instructions are observed provide many years of trouble free operation FOR HUMIDIFIERS INSTALLED IN THE CITY OF LOS ANGELES A city of Los Angeles approved spring loaded double ball CHECK VALVE should be supplied and installed by the contractor on each of the potable water inlets to each humidifier Recommended valve manufacturer Watts Regulator phone 508 688 1811 model 7 size 3 8 NPT inlet and outlet Each drain line from these humidifiers shall be routed without dips or sags to terminate above the flood level rim of a City of Los Angeles approved indirect waste receptor No combustible materials shall be placed in the duct and or the air plenum PRINCIPAL OF OPERATION When the humidistat calls the cylinder fills to 110 of the Full Load Amperage F L A or to the top of the cylinder whichever comes first See Figure 1 If it reaches 110 F L A the water heats and boils away to a level giving 90 F L A Figure 1 Operation Schematic CONDENSATE RETURN OPTIONAL FILL CUP LSTEAM HOSE ELECTRODES 1 INLET CHAMBER 2 FILL CHAMBER 3 WATER OVERFLOW CHAMBER SAFETY DRAIN IN CASE OF FILL VALVE CONTROL BOARD FAILURE CYLINDER SU
3. position for a minimum of five seconds and then switched back to the On position MONITORED LEG Refers to the primary wire to the cylinder which loops through the current sensing devise of the main PCB This wire is terminated at the red cylinder plug at the cylinder STARTING POINT Auto On Off Drain switch in On position unit will not fill When the on off control circuit is made and the auto on off drain switch is pushed to on the 24 volt holding coil of the primary contactor should energize The resulting magnetic pull closes the high voltage contacts with a distinct and audible clunk If the contactor will not make then inspect the following while referring to the wiring diagram 1 Check for 24 Vac across terminals 18 and 26 on PC board 2 Jumper the humidistat on external control terminal strip If contactor operates then control system is at fault 3 The low voltage 3 amp fuse located in the control box could be blown 4 The contactor holding coil could be open or shorted 5 The switch could be defective Recheck that the auto on off drain switch is still at on If itis then shut off the main disconnect and check fuses or breaker of the main disconnect If they are serviceable turn power back on To test for a defective auto on off drain switch connect a wire from the fuse directly to terminal 6 on the external controls strip If the contactor activa
4. water when the impurities already in the water reach an excess concentration as a result of boiling away pure water and the continued boiling action agitating the contained water The humidifier electronics are designed to prevent this occurrence although in extreme cases water will foam with little concentration making it necessary to have the drain time of the water contained in the cylinder increased Foaming is normally caused by short cycling a restricted drain or back pressure The foam generated in these instances is conductive and may lead to false full cylinder indication if the level of the foam approaches the top of the cylinder BACK PRESSURE The restriction of steam flow caused by long steam runs improperly sloped steam lines elbows changing the direction of steam flow from horizontal to vertical without a drain leg any plumbing detail allowing the accumulation of condensate undersized steam line improper steam distributor downward air flow onto the distributor causing excess static pressure at the steam outlets or high static pressure ducts not probable To overcome excess static pressure in the duct a fill cup extension kit should be used In down flow applications a down flow distributor should be used but in some cases the fill cup extension will also be required RESET UNIT HUMIDIFIER To reset the humidifier the auto on off drain switch at the front of the humidifier should be switch to the Off
5. PPLY CONNECTION DRAIN CANAL OPEN TO ATMOSPHERE An electronic timer uses the rate of amp fall to determine the water level The objective is to concentrate current carrying minerals in the cylinder so that a smaller volume of water is required to produce the rated steam output This achieves the longest life for the disposable cylinder because of minimal electrode coverage and use of less energy because the high concentration allows a minimal drain rate When 90 F L A is reached the fill valve will open refilling cylinder to 110 F L A On occasion the drain valve will also come on if water level is too low indicating too high a concentration and the requirement for a dilution of the water in the cylinder If the water reaches top of cylinder before 110 F L A the fill valve shuts off via the sensor and fill boil fill boil cycle continues cycling off the red high water sensor light until the concentration becomes high enough to reach 110 F L A The above described control process will then take over WATER SUPPLY AND PLUMBING 1 The orifice in the fill valve is sized for an extended water pressure range of 30 to 85 psi 2 For water pressure between 15 and 30 psi notify the factory and the next larger size fill valve will be supplied 3 For cases below 15 psi notify the factory and a fill valve with an oversized orifice will be supplied 4 For cases above 85 psi install a pressure reducing valve in the wat
6. THREE PHASE Nortec www humidity com PRIMARY POWER a ke YO CONTACTOR C o la 24 vac 24 VAC INPUT By Others PRIMARY ON OFF CONTROLS 187 insulated fast on For field connection By Others HIGH WATER SENSOR PCB CHANGE CYLINDER LAMP CET Te pe popa apieriepo papoepoe 59 CURRENT TRANSFORMER MES U CONTROL BOARD STEAM CYLINDER NOTE SOLID LINES WIRING BY OTHERS MES U INTERNAL AND FIELD WIRING For PVC or LVC unit with remote or attached electrical WIRING DIAGRAM number 150 6240 REV B Kjuo sjapou uanaauuo aeda ew Ad HON Jaquunu peuss pun ou aonb Yo pqej paecq By uo aqu plep 4 oui 9jonb paeog 2d juousaejda apo OL AOU 5r JOSUBS IEM Y ippuejs Prog ISUS VEMA YIH t 8105 s bunds an We SNAPS WEA WEI 43018 Bugnis SEd VeA WEG LL Bury O MBA UIEXC duiej56uuds sop MAAD pur asoji VBA VEIG DSO AMOUIBAD PWE ISOH 98A WIEJO ZOOSV Ape AjQwassy 109 9e urea jquessy HEU W L wigieumoN PSOH UE OL JaUSEMIEUEJWEQ 6 MAIDS Vue We TE wy HELOP SEL paz papeo buud BSzi0r SEL papeo Puud LPOR ZEL leuas yun ay ajonb Jo paced Buraq 43 ayy uo soquinu Bip e oy ajonb Yapuy junuuoaedeu JapIO OY FWAD ASLS 09 S09E NOlLid RIO530 ONIGWANTd ANY 1V2IH10313 1SM SIYV 38VdS N SAW LIMITED WARRANTY NORTEC INDUSTRIES INCORPORATED and or NORTEC AIR CONDITIONING INDUSTRIES LIMITED hereinafter collectively referred to as THE COMPANY warrant fo
7. e steam distributor steam supply hose and condensate line are correctly installed and routed back to the unit Ensure that the external control humidistat is located in an area to properly sense the relative humidity to be maintained by the humidifier and that the interconnecting low voltage wires between the humidistat and the unit s control terminal strip are in accordance with the wiring diagram Check all electrical connections for wires which may have become loose in shipping Components damaged due to loose connections are NOT under warranty Check electrode plugs to ensure they are pressed firmly onto the electrode pins Important Loose connections will cause overheating of the cylinder plugs possibly melting the plugs and or cylinder Open the isolating valve in the feed water line to the unit Make sure the humidistat is set high enough to call for humidification Turn on the main disconnect in the primary service feeding the unit and check that unit has power at the primary terminal block PUSH THE AUTO ON OFF DRAIN SWITCH TO ON Water will start to enter the cylinder through its bottom port and rise in the cylinder to a point determined by the solid state control circuitry It is not unusual upon initial start up for the water to fill the cylinder and cycle on the red high water sensor light The red light simply acts as a safety to shut off the fill valve and prevent over filling With the red light on th
8. e the electrodes Because of the high voltage across the electrodes the water can now conduct electricity Red Change Cylinder light on Water at top of cyl inder This is a common occurrence on start up See Start Up and Operation section of this manual If the cylinder is old it indicates end of cylinder life Time to replace the cylinder See When To Replace The Steam Cylinder section of this manual Red Change Cylinder light on Water NOT at top of cylinder Water foaming to top of cylinder causing false full cylinder indication This also may be accompanied by arcing flashing inside cylinder Refer to Terms Used regarding foaming Water remains at high level and won t concentrate This is normal on cold start up and can be accelerated by adding maximum 1 2 tsp of dissolved salt to the cylinder through the plastic fill cup on fill cycle See Low Water Conductivity section of this manual If unit has been operating extensively observe for normal fill boil fill boil cycle no drain should be occurring If drain occuring check for leaking drain valve or back pressure Water beyond top of cylinder up into spout If the red light is not on and fill is still activated jumper across the connection of sensor on basic PC board If fill remains on when connection is jumped then basic PC board is faulty If fill shuts off then verify primary voltage to cylinder contactor energized If pr
9. e water in the cylinder will continue to heat and after a few minutes start to boil After the boiling action of the water has lowered the water level below the sensor at the top of the cylinder the red light will go out and the fill solenoid will again open until the cylinder is again full This cycling of the red light and fill valve will continue until the unit s full output capacity is reached after which the water level will automatically lower itself in the cylinder The increased concentration allows for lower electrode coverage while maintaining the same output When a stabilized condition is reached the water will be boiling close to the cylinder seam level The solid state circuitry will maintain the proper concentration in the cylinder by introducing short drains only when necessary If the cylinder is manually drained the above process will repeat itself Low Water Conductivity Should normalization of the unit be required immediately after start up the installer may speed up the process by artificially increasing water conductivity During a fillcycle the installer should dissolve half a teaspoon of table salt no more in a cup of water and add it to the cylinder by means of the fill cup attached to the plumbing section Open the plumbing compartment and add salt solution through cylinder outlet Excessive amounts of salt will result in erratic operation of the unit however normalization of the unit will occur a
10. er feed line to the unit 5 With extremely dirty or muddy water sources e g some well sources ensure proper filtration by adding an external filter to the water line entering the unit Consult factory for accessories such as filters 6 DO NOT use completely demineralized water with this unit as it is the minerals that allow the electrode principle to work 7 DONOT use a hot water source as it will cause deposits that will eventually block the fill valve orifice WATER CONNECTION Figure 2 Bottom View of MES U Unit 3 8 Cold Water Olive Connection 7 8 Drain Connection Use 7 8 I D Hose From Factory 1 Acopper compression olive type coupling for 1 4 O D soft copper tubing is provided with unit and requires no soldering for the water connection to the unit See Figure 2 2 Anisolating valve should ALWAYS be placed in the feed water line allowing service of the fill valve 3 Each unit is fitted with a fill solenoid valve located on the base drain pan Flow orifices are designed for water pressure from 30 to 85 psi and are protected by the built in strainer 4 Forinlet water pressure outside this range the factory should be contacted See Water Supply and Plumbing section of this manual START UP AND OPERATION Check to see that the unit is securely mounted on a level surface with the proper drain and water supply Check for correct voltage with appropriately sized service Check that th
11. h a copy of the catalog and installation manual in effect at the date of purchase and by a contractor approved by THE COMPANY to install such equipment THE COMPANY makes no warranty and assumes no liability whatsoever for consequential damage or damage resulting directly from misapplication incorrect sizing or lack of proper maintenance of the equipment THE COMPANY retains the right to change the design specification and performance criteria of its products without notice or obligation a Nortec WHEN YOU NEED HUMIDITY Model Serial Cylinder Cylinder Last Replaced MTH DAY YR MTH DAY YR MTH DAY YR UL NORTEC INDUSTRIES INC NORTEC AIR CONDITIONING P O Box 698 INDUSTRIES LTD 826 Proctor Avenue 2740 Fenton Road Ogdensburg NY 13669 Ottawa ON K1T 3T7 A WMH COMPANY PRINTED IN CANADA
12. imary voltage is present the high water sensor PCB is defective Unit drains continually May be caused by foaming and or back pressure or leaking drain valve Cylinder is almost empty check for magnetic pull on drain solenoid indicating miswiring If no pull drain actuator is blocked open remove disassemble and clean If drain is occurring through activated drain valve valve is miswired or electronics are faulty consult factory If drain is occurring through the overflow on the fill cup this is due to abnormal restriction on the steam line and back pressure forces water out of the cylinder therefore water cannot concentrate and level must stay high review installation of steam line to ensure no blockages or excessive static pressure in air system DIMENSIONS inom __ REMOTE ELECTRICAL ATTACHED ELECTRICAL in cm 10 5 26 7 cm WEIGHTS DRY CONFIGURATION 1 2 3 4 5 6 7 8 9 NOTES 1 FOR HEIGHT OF 5 LB PVC USE HEIGHT OF 10 LB MODEL 2 PVC PRIMARY VOLTAGE CONNECTION 3 MODEL SHOWN 163 91X5 CONFIGURATION 5 WITH CP CLOSED PLUMBING COVER REMOVED ANN FRONT VIEW LEFT VIEW MES U MES P HUMIDIFIER po A N t MESU DIM 10 19 98 Lm d or ec PHYSICAL DATA WHEN YOU NEED HUMIDITY PRIMARY TERMINAL BLOCK provided with PVC unit HIGH VOLTAGE ELECTRODE LEADS BY OTHERS OR INCLUDED WITH PVC UNIT 2 LEADS FOR SINGLE PHASE 3 LEADS FOR
13. r s Warranty Figure 4 Cylinder Removal REMOVING THE OLD CYLINDER a See Figure 4 1 Turn off the water supply to unit 2 The old cylinder must be drained completely before removing This is done by pushing the auto on off drain switch to the drain position 3 When completely drained push the auto on off drain switch to the off position 4 Open the main disconnect during the entire cylinder change operation 5 The power wires to the cylinder are attached by cylinder plugs to the electrode pins on top of the cylinder Pull these plugs vertically off the pins See Figure 4 6 Using slot screwdriver loosen the steam hose clamp s and pull steam hose off vertically 7 The cylinder is now ready to be lifted out of the unit INSTALLING THE NEW CYLINDER Figure 5 Plugs White Sensor Plug r d Sensor Pin Cylinder gen okipan Cylinder Pin Cylinder Pin Sensor Pin 3 Cylinder Pin 7 Cylinder Pin 1 The reverse procedure should be followed to install a new cylinder The main disconnect is to be left open until the cylinder is completely installed and reconnected 2 Ensure that the cylinder mounting stubs are seated properly in the allotted side mounting slots within the unit 3 The white sensor plug on all units is for the sensor pin which always goes on the single pin offset from the others See Figure 5 4 Ensure that cylinder plugs are
14. r a period of two years from date of shipment that THE COMPANY s manufactured and assembled products not otherwise expressly warranted with the exception of the cylinder are free from defects in material and workmanship No warranty is made against corrosion deterioration or suitability of substituted materials used as a result of compliance with government regulations THE COMPANY s obligations and liabilities under this warranty are limited to furnishing replacement parts to the customer F O B THE COMPANY s factory providing the defective part s is returned freight prepaid by the customer Parts used for repairs are warranted for the balance of the term of the warranty on the original humidifier or 90 days whichever is longer The warranties set forth herein are in lieu of all other warranties expressed or implied by law No liability whatsoever 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 NORTEC s manufacture such as controls humidistats pumps etc is limited to the warranty of the original equipment manufacturer from date of original shipment of humidifier THE COMPANY makes no warranty and assumes no liability unless the equipment is installed in strict accordance wit
15. tes the on side of the switch is defective If the contactor does not activate the PC board could be defective If the 3 amp control fuse blows when the wire from the fuse touches terminal 6 on the external controls strip contactor holding coil could be shorted Replace contactor if necessary Return wires to normal After the necessary components have been replaced and the contactor pulls in there is line voltage to the cylinder and the control sequence can begin Approximately 30 seconds after the contactor pulls in the fill valve coil should energize There is also a visible fill relay on the printed circuit board It is the one located farthest from the C T core The points on this relay must be touching in order for the fill valve coil to be energized If the points will not touch after the built in time delay then the sensor input may be interfering To confirm remove the black and red sensor wires from the terminals 6 and 10 on the PC board Wait 30 seconds and if the fill relay points not touch then sensor should be replaced If they do not touch then the basic PC board could be faulty To confirm disconnect the red wire from terminal 18 and touch it to terminal 14 If the fill valve coil activates then the basic PC board should be replaced If it still does not activate then the fill valve coil should be replaced Having changed the necessary components water starts filling the cylinder and begins to submerg
16. utomatically through the solid state control sequence APACITY AD TMENT Figure 3 Adjustable Pot ae Adjustable lt w o Capacity Pot The MES U series of humidifiers come with adjustable capacity AC PC boards These boards have a pot labeled 20 to 100 See Figure 3 CYLINDER REPLACEMENT After an extended period of operation in accordance with life expectancy information the cylinder is completely used as indicated by the red high water sensor light illuminated on the cabinet When this condition is reached a new replacement cylinder is to be installed NOTE Red light may come on during initial start up but does not mean cylinder replacement See Start Up and Operation section of this manual Consult factory or agent for replacement Quote the cylinder model from the white 3 digit label on the cylinder or quote model voltage and serial number from unit specification label WHEN TO REPLACE THE STEAM CYLINDER The steam cylinder is disposable and must be replaced at the end of cylinder life Cylinder life is dependent on water supply conditions and humidifier usage Failure to replace the cylinder at the end of cylinder life may result in unit damage NORTEC is not responsible for any damages resulting from or attributable to the failure to replace a used cylinder see Manufacture
17. very snug on the pins 5 Forloose fitting plugs a temporary solution is to squeeze plugs with a pair of pliers before installing Since loose plugs may generate enough heat to melt and destroy the plug and cylinder new plugs must be ordered MAINTENANCE WARNING The plumbing and electrical compartments contain high voltage components and wiring The access cover is attached with screws Access should be limited to authorized personnel only EXTENDED SHUTDOWN Before disconnecting power to the humidifier for a period of extended shutdown ALWAYS DRAIN the cylinder first Otherwise the electrodes are subject to harmful corrosion which drastically shortens the cylinder life Do NOT leave the switch in the DRAIN position indefinitely as the drain coil could burn out Leave the switch in the OFF position and open the main external fused disconnect to stop power to the humidifier Close the shut off valve in the water supply line feeding the humidifier TROUBLESHOOTING TERMS USED F L A Full Load Amps Refers to amps listed on the humidifier specification label SHORT CYCLING When the on time of the humidifier is less than ten minutes upon a call for humidity To correct short cycling all humidifiers have a capacity adjustment which allows the output of the humidifier to be reduced to as low as 20 of rated output thus extending the on time required to maintain output FOAMING The phenomenon which can occur in
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