DRH- 04
Contents
1. 4 10 1 6 5 Fan sse 1 5 445 Replacing a Nebulizer Print Plate 4 11 1 6 6 1 5 446 Water Solenoid Valves Float Switches and 1 6 7 Water Fill Valve Solenoid 1 5 89 Water Tug urs 50 Product Support Group ow ie 9 5 1 1 6 11 Temperature 1 5 a T 59 Obtaining Spare Replacement Parts 5 1 1 6 12 Solid State 1 6 1 6 13 Level Controller 1 6 6 0 Drawings 6 1 20 Installation Dui Ph cS ea es 2 1 Receiving the 2 4 6 2 Electrical Circuit Diagrams 6 2 2 2 Site Preparation 2 1 2 3 2 2 2 4 Supply and Drain Piping 2 2 List of Figures 2 5 Main Power Control Wiring 2 4 Figure 1 Installation of Humidifier 2 1 Figure 2 Locating the Humidifier 2 2 3 0 Operation eene 3 1 Figure 3 Water Inlet Filter 2 3 2 PAGNE SUPP a Figure 4 Piping Connections2. 2 3 3 2 Initial Operation Checklist 3 1 3 3 Procedure For Operation 3 1 3 4 Precautions quu 3 2 35 Steps for Long Term Shutdown 3 2 4 0 Maintenance Repairs 4 1 4 1 Periodic General Maintenance 4 1 4 1 1 General M 9 4 1 4 2 Maintenance Items and Necessary Tools 4 2 April 2013 j STLUILZ E DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 1 0 INTRODUCTION 1 1 General Recognized as a world leader Stulz Air Technology Systems Inc STULZ Ultrasonic Humidifiers are designed and manufactured with the highest quality craftsmanship using the finest materials available in the industry Your ultrasonic humidification system will provide years of trouble free service if installed and maintained in accordance with this manual Damage to the unit from improper installation operation or maintenance is not covered by the warranty This manual contains information for installation operation maintenance troubleshooting and repair STUDY the instructions contained in this manual They must be followed to avoid difficulties Spare parts are available from STULZ to ensure continu ous operation Using substitute parts or bypassing electrical components in order to continue operation is not
3. 2 If the cause can not be located through the above checking remove the mist guide cover and air flow guide and check the interior of the water tank No mist is t Dust and foreign material are accumulated in Clean the interior of the water generated the water tank tank Amount of mistis Dust and foreign material are accumulated Visually check too low the water tank the interior of the water tank t Scale deposited on transducer surface Clean interior of water tank and replace the transducer Hemarks The causes of failures marked t can be prevented through periodic maintenance inspection See Section 4 1 Periodic General Maintenance April 2013 4 6 STLUILZ DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 3 If the cause cannot be located through the above checking parts may faulty Check the interior of the humidifier ee Water supply float Drai If there is no continu No mist is l rain the water tank nenied Water supply switch FS1 is faulty remove the printed circuit ity replace the switch control system board terminal X3 and Clean the switch If test the continuity of the operation is not re float switch stored replace switch t Water supply float switch sticking Water supply sole No water supply is pro Replace the noid valve is faulty even if the water tank is solenoid valve drained and voltage between ter
4. On Board Jumper Setting see Switch ae Humidistat OPTION 3 MODULATING SIGNAL 10K Potentiometer M4 Enable Switch N ODry Contacts Humidistat M 2 X 10K Ohms x d 2 3 On Board Jumper Setting o olo April 2013 6 3 Globally close to you Stulz ATS located in Frederick MD USA is part of The STULZ Group with headquarters in Hamburg Germany and production facilities world wide Our network of manufacturer s representatives and sales partners span the globe providing innovative solutions to your unique environmental control needs www stulz ats com Stulz Air Technology Systems Inc 15 2 Tilco Drive Frederick Maryland 21704 Phone 301 620 2033 Fax 301 662 5487 Email info stulz ats com STLILZ www stulz ats com ISO 9001 Quality Registered OUD0077D April 2013 DRH Series GEN1 Installation Operation amp Maintenance Specifictions are subject to change without notice
5. 4 5 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 4 2 5 Water Tank 1 Loosen the fan casing mounting screws 4 Pcs on the sides of the humidifier and slide it up from the base Photo 11 2 Turn the fan casing on it s side Remove the screw inside the casing 1 Pcs holding the air flow guide water tank cover Photo 12 3 Return the fan casing to an upright position and remove the screws 2 Pcs holding the airflow guide on top of the humidifier Remove the air flow guide Photo 13 4 Check the water tank interior for contamination Wipe and clean the water tank interior and clean the surface of the transducers etc in the water tank by wiping with a soft oil free cleaning cloth Photo 14 Note Be careful not to scratch the surface of the transducers 4 2 6 Mist Guides 1 Rotate and remove the mist guide tubes from the air flow guide water tank cover Photo 15 amp 16 2 Clean the mist blow tubes with clean water Note It is essential that the mist outlet and its surrounding area are free from foreign material Note Be careful not to damage the rubber ring portion of the mist outlet 3 Re assemble by reversing the above procedure April 2013 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 4 3 Troubleshooting and Repair Should any failure occur make the necessary repairs referrin
6. DRH Series GEN1 Design Ultrasonic Humidifier READ AND SAVE THESE INSTRUCTIONS LIRE ET CONSERVER CES INSTRUCTIONS MODELS DRH 04 DRH 08 DRH 06 DRH 16 Installation Operation amp Maintenance Manual MODEL NOMENCLATURE DRH 04 S Ultra Series Control DRH Direct Room Humidifier S Stand Alone DAH Ducted Air Humidifier Blank 04 Number of Transducers 06 08 16 Notice This document contains information protected by copyright All rights are reserved The owner of the equipment for which this manual is written may photocopy the contents of this manual for internal use only No part of this document may be photocopied reproduced or translated into another language for use by anyone other than the owner of the equipment for which this manual is written without the prior written consent of Stulz Air Technology Systems Inc STULZ This document contains confidential and proprietary information of Stulz Air Technology Systems Inc Distributing or photocopying this document for external distribution is in direct violation of U S copyright laws and is strictly prohibited without the express written consent of STULZ Unpublished rights reserved under the copyright laws of the United States and of other countries Other brands and tradenames are trademarks of their respective owners Copyright 2010 by Stulz Air Technology Systems Inc Printed in the United States of America All righ
7. Use only non corrosive stainless steel or poly tubing rated for use with DI water to supply the humidifier CAUTION Provide a drain with an air gap per local and national plumbing codes CAUTION Never block the mist outlet or the opening of the air inlet The humidifier may be filled with the condensed mist and electrical shorts may result CAUTION Observe the unit for water leakage A short circuit could occur if the humidifier is splashed with water while operating CAUTION Never attempt to remove the mist guide cover and or the mist blow tubes while the humidifi er is operating or electrical shorts may result CAUTION If there is a risk of supply water freezing pipe insulation should be provided CAUTION Never apply power when the humidifier is overturned or upside down Damage to the ultrasonic nebulizer unit or transducer may result CAUTION Never drop the humidifier or apply hard shock to it It may damage internal parts CAUTION Drain the water in the tank for sanitary rea sons when humidifier is turned is off for more than 3 days Ultrasonic Humidifier Model DRH 06 April 2013 1 2 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 1 3 Product Warranty STULZ offers a standard two year limited warranty as stated below 2 Year Standard Limited Warranty Stulz Air Tec
8. mm nut driver remove the mounting nut holding the sensor in place Remove the sensor and the insulating parts Save the nut and insulating parts to mount the new sensor Photo 22 2 Carefully cut the wire ties bundling the sensor cable and unscrew the sensor wires from the terminal connectors on the printed circuit board 3 Connect the new sensor wires to the printed circuit board lt a Washer 44 Shoulder Washer 4 Install the new sensor to the print plate together with the saved mica pad and insulating parts Ensure the insulating bushing is correctly placed to prevent the sensor from shorting Sensor to the mounting stud Photo 23 Mica Pad 5 Referring to Sect 4 4 2 Re assembling re assemble the unit by reversing the procedure described in Section 4 4 1 4 4 3 2 Temperature Sensor on Water Tank 1 The temperature sensor is mounted on the front of the tank near the float switches Carefully cut the wire tie holding the sensor cable and remove the nylon screw holding the sensor in place Remove the sensor and save the mica pad and nylon screw to mount the new sensor Photo 24 2 Remove the terminal connector from the sensor and connect it to the new sensor Ensure the three slots in the terminal connector are oriented upwards Photo 25 3 Install the new sensor to the tank together with the saved mica pad Cable tie the sensor cable restrain it Sensor 4 Referring to Sect 4 4 2 Re ass
9. recommended and will VOID THE WARRANTY Due to technological advancements components are subject to change without notice STULZ DRH Series Ultrasonic Humidifiers are de signed as stand alone direct room humidifiers Any use beyond this is deemed to be not intended STULZ is not liable for any damage resulting from improper use The system is designed to be installed indoors unless otherwise noted on the equipment nameplate 1 2 Safety 1 2 1 General Stulz Air Technology Systems Inc uses NOTES along with CAUTION and WARNING symbols throughout this manual to draw your attention to important operational and safety information A bold text NOTE marks a short message in the information to alert you to an important detail A bold text CAUTION safety alert appears with infor mation that is important for protecting your equip ment and performance Be especially careful to read and follow all cautions that apply to your application A bold text WARNING safety alert appears with information that is important for protecting you from harm and the equipment from damage Pay very close attention to all warnings that apply to your ap plication A safety alert symbol N accompanies a general WARNING or CAUTION safety statement A safety alert symbol accompanies an electrical shock hazard WARNING or CAUTION safety state ment 1 2 2 Safety Summary The following statements are general guidelines fol lowed by warnings and cauti
10. to flush any particulates from the tank utilizing the system controller see STULZ Ultra Series controller IOM manual OUU0078 Section 5 5 1 2 4 Set the humidity setpoint to the desired humidity level C1 When power is supplied to the humidifier and there is a demand for humidification water flows into the unit When the water in the tank reaches the required level the ultrasonic nebulizers will start producing mist If the unit does not start operating increase the humidity setpoint to create a demand for humidification During operation the humidifier starts and stops by means of a signal from the control box The water level in the water tank is maintained by the level controller CO N O If the water level in the tank falls below the safety level for any reason during operation power to the ultrasonic nebulizers is cut off by the level controller After operation is started check the following items on a regular basis Atomized mist is visible through all the mist blow tubes Check the humidifier parts overflow pipe and other piping for signs of leaking water Change the humidity setpoint to ensure the control box is interconnected properly and that it controls the operation of the humidifier Check to see that the mist diffusion is good and that objects in the room or any obstacle are not directly exposed to the mist April 2013 STUILZ 3 1 DRH Series GEN1 Ultrasonic Humidifier Installation
11. unit in a secure location where it cannot be tampered with and the power switch cannot be inadvertently turned off Allow access to the unit for routine operation servicing and for necessary maintenance Position the humidifier in such a way that the unit can be easily removed for future inspection and maintenance Refer to the installation drawing provided with your unit for the dimensions of the humidifier NOTE Working clearance requirements need to be established prior to mounting the unit Refer to local and national electrical codes Figure 1 Installation of Humidifier When selecting the installation location atten tion should be paid to the air flow in the room so that the atomized mist can be uniformly diffused throughout the room If any obstacle 18 exists in front of the atomized mist outlet the mist will be condensed on the obstacle to form water droplets 4 Air inlet t Air inlet S Ceiling system Bracket system 2 1 April 2013 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual The humidifier must be installed horizontally and level to prevent the float switches from giving a false reading Prepare hanging bolts for installing from the ceiling or brackets for wall mounting See Figure 1 The distance from the humidifier to the ceiling should be a minimum of 18 and the distance to the wall must be 3 or more For the installation mounting ba
12. water has evaporated To avoid this always use DI or RO supply water 2 The nebulizing capacity of the transducer in the ultrasonic nebulizer unit decreases gradually with use It should usually be exchanged after about 10 000 to 15 000 hours of operation depending on water quality and suitable voltage although the unit may continue to run as long as it s effective capacity meets the particular requirements 3 To ensure full warranty coverage the input voltage to the humidifier must not exceed 51VDC If the input voltage exceeds 51VDC damage to the transducers and print plates will result April 2013 1 4 1 5 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 1 5 General Design The DRH Ultrasonic Humidifier directly atomizes water producing a fine mist The humidifier incorporates high frequency nebulizers to produce ultrasonic waves a fan to propel the mist out and an automatic water supply mechanism to maintain the supply water at a constant level When conducting routine maintenance it is important to clean the air filter and water tank because it significantly affects the humidifying capacity and life of the ultrasonic nebulizers 1 6 Main Parts 1 6 1 This consists of a modular assembly located in the bottom of the water tank incorporating a 1 6Mhz power oscillator on and a piezoelectric transducer The transducer vibrates at that frequency developing ultrasonic columnar
13. waves in the water and producing a fine mist above that column Ultrasonic Nebulizer Unit 1 6 2 Mist Guide The mist guide carries the mist off the top of the columnar wave and directs it up and out of the humidifier 1 6 3 High Water Float Switch For maximum atomization it is essential the water level in the tank be constantly maintained The High Water Float Switch is an input to the Level Controller It is open when the water level is below the optimal level and is closed when the water level reaches the maximum level 1 6 4 Low Water Float Switch Operating the humidifier when the water level is below the top of the transducers will damage the UI trasonic Nebulizer Unit The Low Water Float Switch is an input to the Level Controller It is open when the water level is near an unsafe level and is closed when the water level is at a minimal level 1 6 5 Fan The 24VDC fan or fans both lightly pressurizes the air above the water to provide a path for the mist to pass through the Mist Tubes and provides a sheet of air to carry the mist away from the humidifier into the room The fan is controlled by the Level Controller 1 6 6 Air Filter The Air Filter removes coarse dust from the air and prevents the humidifier water tank from becoming dirty which would affect the mist output 1 6 7 Water Fill Valve Solenoid The Water Fill Valve Solenoid is a 24VDC solenoid that allows water from the water supply to enter into the
14. 0 OPERATION 3 1 Purge the Water Line Before operating the unit metal shavings or debris that may form during the installation process must be flushed from the water supply piping Perform the following steps before allowing water to flow into the humidifier 1 Ensure the main disconnect switch from the control box is set to Off for safety 2 With the water supply valve closed disconnect the supply tubing from the filter strainer in the side of the unit 3 Open the supply valve and flush the tubing into a bucket or building drain for about 30 seconds 4 After the water line is purged close the valve and reconnect the supply line to the inlet filter strainer 3 2 lnitial Operation Checklist For new installations ensure the unit is ready to operate by going through the following checklist prior to start up The humidifier is installed horizontally and level No obstacle is within 15 feet in front of the atomizing direction The electrical wiring is correctly connected De ionized or reverse osmosis water supply is used The water supply piping and overflow piping are correctly connected and secured Oo U N All parts are correctly installed After the above items are checked operation may begin 3 3 Procedure for Operation 1 Turn the main power source switch on the control box to the position 2 Open the water supply valve allowing water to flow to the humidifier 3 Perform a manual drain cycle
15. ARTICULAR PURPOSE SZ 2 v v OKO v CIO o O o o o OIRO o o v v OIRO o oo CA RWI LA RI RY WOT BROT WOT WOT KA WOW RYT RO BO WO WO UO KA EO OF KI ROT RE RO RIT RT RW ROR OR KKK DRX ROR ORR OR DR DR DR OR ORR ORR DR DR OR OR DR OR RDN OK AAS EAS EAN LAN LAS LEN LAN LAN OS EAS AIS LAN LASS ANS ZAIN AINA AIS AINA LIONS LIONS AKIN IONS OS EAN Conditions for Maintaining Warranty Coverage 1 De ionized DI or Reverse Osmosis RO water is used as the supply water for the humidifier 2 STULZ provided controls are used with the humidification system 3 Input voltage to the humidifier does not exceed 51VDC o v o April 2013 STLILZ DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 1 4 Specifications x v5 Dysweeswwewm 5 8 5 Power source 48VDC Weight Ib 24 3 30 9 50 7 Electrical Characteristics O Operating conditions 34 to 122 F 90 RH or less Parts to be provided by user DI or RO supply water Water supply valve Water supply tubing 1 4 stainless steel or poly tubing rated for DI water power supply wiring and control wiring to the control box Notes 1 Calcium magnesium or other agents that may be contained in the supply water are atomized into the air together with the mist and may form white powders after the
16. Before re assembling the humidifier confirm there is no wa ter leakage by pouring water into the tank 2 When re assembling after replacing parts inspect the interior and check the following points All the screws must be securely tightened All the lead wires must be correctly and securely connected Special attention should be paid to the fan lead wires All the plates boards and relays must be free from discoloration deformation and deterioration Electrical wires must not be damaged 3 After re assembly is completed supply water and power to the unit and turn it on Check to see that normal nebulizing mist is visible from all the mist blow tubes and that there is no water leakage April 2013 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 4 4 3 Replacing the Temperature Sensor The temperature sensor is mounted to either the first nebulizer print plate or on the front of the water tank depending on when your unit was shipped Referring to Section 4 4 1 Preparation for Repairs steps 1 5 place the water tank on a well lit work surface Determine the sensor location see photos 22 and 24 Refer to section 4 4 3 1 if the sensor is mounted on the nebulizer print plate Refer to section 4 4 3 2 if the sensor is mounted on the tank 4 4 8 1 Temperature Sensor on Nebulizer Print Plate 1 The temperature sensor is mounted to the first nebulizer print plate Using a 5 5
17. INGS 6 1 Layout Drawing of Humidifier Covers Removed to Show Parts The bubble numbers in the drawing coincide with the item numbers listed below 1 Stub 1 8 NPT 4 MistGuideTube 6 Blower 8 Filler April 2013 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 6 2 Electrical Circuit Diagrams Typical Wiring Diagram for Modbus Version ARVDC 222 VV V From Control Box 18100 MODBUS MOBBUS MODBUS GND Termination Resistor Required On Last Unit In The String PCB Level Controller N a gt lt lt gt lt gt lt X Over Temp Sensor DO DC n 9 4 9 Solid State Fan SK 8 Fil Valve Drain Valve X2 High Level Low Level Solenoid Solenoid Switch Switch Current of Relay Ea i i Nebulizers 6 2 April 2013 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual Typical Wiring Diagram for Stand alone Version 4810 C 48VDC V V PCB Level Controller ae d Over Temp Sensor BLUE RED DC DC 9 Solid State Relay Fil Valve Drain Valve High Level Low Level Solenoid Solenoid Switch Switch OPTION 1 ON OFF M 4 Enable Switch N O Dry Contacts Humidistat M 2 M M d On Board 2 3 Jumper Setting OPTION 2 MODULATING SIGNAL 0 10 VC
18. Operation amp Maintenance Manual 3 4 Precautions Do not remove the air filter at the bottom of the humidifier during operation Do not block the outlet of the mist blow tubes It could cause a failure if the mist flow is reversed Drain the water from the water tank for sanitary reasons if the unit is turned off for more than 3 days 3 5 Steps for Long Term Shutdown If the humidifier is not signalled to turn On for a period of three days the level control board will automatically signal the humidifier to operate a drain cycle When operation is stopped for a long time one week or longer the following steps may be performed Also refer to Section 4 1 Periodic General Maintenance Close the water supply valve Drain the water tank Turn the main switch on the control box to Off Check and clean the water tank interior and the air filter To restart operation after a long term shutdown see the previous Section 3 3 Procedure for Operation April 2013 3 2 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 4 0 MAINTENANCE REPAIRS 4 1 Periodic General Maintenance Systematic preventive maintenance of the humidifier is recommended for optimum system performance Rou tine periodic maintenance should include but is not limited to the following Tightening electrical connections Cleaning inspecting the unit s components visually Checking the level of water an
19. agonal wire cutter April 2013 4 2 4 3 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 4 2 1 Air Filter 1 Stop the humidifier 2 Loosen and remove the filter case mounting screws 2 Pcs at the lower front of the humidifier Photo 1 3 Pull out the filter case Photo 2 4 Wash the filter media with clean water 5 Lightly shake off excess water and dry it well in the shade 6 When the filter is dried put it back in the filter case install the stopper and install the filter case in the humidifier 7 If the filter is seriously clogged and cannot be cleaned by washing with water or if it is seriously deteriorated it should be replaced with a new one 4 2 2 Water Supply Filter Strainer 1 Stop the humidifier set the control box disconnect switch to Off and close the water supply valve 2 Loosen the bowl on the filter strainer assembly and remove it Photo 3 3 Remove the element and rinse the filter and the inside of the bowl with water 4 Inspect the filter element If dirty replace the element with a new one 5 Re install the filter element and bowl on the filter strainer 4 2 3 Electrical Parts 1 Stop the humidifier set the control box disconnect switch to Off and close the water supply valve 2 Drain the water tank Note Be careful not to splash water onto the electrical parts 3 Remove the mist guide cover from th
20. cause the humidifier incorporates sensitive electronic parts When parts are replaced genuine STULZ parts must be used Contact STULZ Product Support for assistance 4 1 April 2013 D RH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manua 4 2 Maintenance Items and Necessary Tools Cycle Description Necessary Tools Routine Maintenance Air filter cleaning About once a week depending Sect 4 2 1 on the extent of contamination The interval should be short ened if environmental condi tions are particularly dusty Clean replace water Once every 3 months or as Sect 4 2 2 supply filter strainer required if water supply qual element ity is poor Check water tank Once a month or as required Sect 4 2 3 interior mist blow tubes if environment is dusty or and electrical parts water supply quality is poor Replacing Parts Replacing temperature If damaged or upon failure Sect 4 4 3 sensor Replacing transducer After about 10 000 to 15 000 Sect 4 4 4 hours of operation If damaged or upon failure Repl bul Frid LO Also recommended when Sect 4 4 5 print plate replacing transducer Replacing water supply solenoid valve Replacing float switches If damaged or upon failure Sect 4 4 6 Replacing printed circuit board Phillips screwdriver Adjustable wrenches 2 Phillips screwdriver 5 5 mm Nut driver Soft cleaning cloth Small brush Di
21. ces All wire sizes listed are for stranded THHN or NTW wire only Do not use solid conductor wire For distances over 75 feet please consult the factory Model Power Cumen WieSieuAwG orwies amps som 7sm Prop omom NOTE The table above reflects the correct electrical wire sizing from the control panel to the humidifiers for three different lengths Wire sizes listed are for stranded wire only either THHN or NTW Do not use solid conductor wire Do not exceed 75 ft maximum distance 265 In addition to the above power wires humidifiers controlled by the Ultra Series controller require 3 conductor shielded 22 AWG Modbus cable daisy chained from the humidifier s to the controller The Modbus cable is not to exceed 1000 feet total length A termination resister must be installed on the last humidifier as shown in the electrical drawing provided with your unit CAUTION The termination resistor is to be placed only on the last unit in the Modbus string CAUTION It is important to note that the power supply provided with the equipment is sized and selected based upon the expected load for the unit Do not connect any additional loads to the control power supply Connecting additional loads may result in overloading which will cause the power supply to shut down April 2013 2 4 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 3
22. ckaging Open the box and thoroughly inspect the unit for any signs of transit incurred damage If there is shipping damage it must be noted on the freight carrier s delivery forms BEFORE signing for the equipment Any freight claims MUST be done through the freight carrier STULZ ships all equipment FOB factory STULZ is not liable for any equipment damage while in transit STULZ can assist in the claim filing process with the freight carrier Should any such damage be present notify the STULZ Product Support Group prior to attempting any repairs Refer to Section 5 0 of this manual for instructions Check the equipment against the packing slip to see if the shipment is complete Report all discrepancies to the appropriate authority Contents of Package 1 Humidifier 2 Supply water filter strainer 3 Installation Operation and Maintenance manual Avoid dropping or jarring the unit to prevent damage to the internal parts The unit should always be stored in a dry location prior to installation A Data Package has been sent with your unit It contains this manual system drawings applicable MSDS s and other applicable instructions based on the configuration and options selected for your unit The data package has been placed in your unit in a clear plastic bag These documents need to be kept with the unit for future reference 2 2 Site Preparation STULZ ultrasonic humidifiers are designed with easy service access in mind Install the
23. d A low level alarm is annunciated when the microprocessor sees the Low Level Float Switch indicate low water after the tank has been filled A fill alarm is annunciated when the High Water Float Switch does not indicate the water level has been achieved after a predetermined amount of time A transducer alarm is annunciated if the transducers have been energized and no water is used in a predetermined time indicating no transducer is functioning For the Modbus version of the Level Controller failure to receive commands on the Modbus within a predetermined amount of time will annunciate a communications alarm The Level Controller has an LED that displays via blinking any alarm condition that occurred after power up Each alarm is associated with a number of blinks followed by a pause and then the next alarm is displayed To view the LED the Mist Guide Cover must be removed and the electrical access cover removed The LED blink pattern for each alarm is 6 8 Transducer DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 2 0 INSTALLATION 2 1 Receiving the Equipment Your Ultrasonic humidifier has been tested and inspected prior to shipment To ensure that your equipment has been received in excellent condition make a visual inspection of the equipment immediately upon delivery Carefully remove the shipping container and all protective pa
24. d ensuring no leaks are present A system should be established to record any problems defects or deficiencies noted by operators and discov ered during maintenance inspections together with the actions taken For assistance contact STULZ Product Support see Section 5 0 Ensure adherence to all safety precautions while performing any type of mainte nance 41 1 General Before the maintenance inspection and repairs are done be sure to set the control box power switch to Off and close the water supply valve WARNING Turn off power to the unit unless you are performing tests that require power With power and controls energized the unit could begin operating automatically at any time Solid scaffolding must be provided for working in high places Care must be taken avoid injury by sharp edges of the sheet metal etc CAUTION The transducer is a very delicate part When the water tank interior is cleaned special care must be taken to ensure the transducer is not scratched on the surface with a screwdriver etc Do not supply power to the ultrasonic nebulizer units while the transducer lead wires yellow and orange are removed Proper tools must be used Excessive tightening or insufficient tightening may cause failure When performing maintenance or repairs care must be taken to ensure small parts such as screws will not be lost Testing insulation resistance and dielectric withstand voltage should be avoided be
25. days at which time an evaluation of the part s is conducted and if the part is found to have a manufacturing defect a credit will be issued When returning defective part s complete the Return Material Authorization Tag and the address label received with the replacement part See the STULZ Standard Warranty located in section one of this manual 5 3 Obtaining Spare Replacement Parts opare and replacement parts requests are to be made through Product Support by fax 301 620 2606 telephone 240 529 1399 or E mail parts stulz ats com Quotes are given for specified listed parts for a specific unit STULZ accepts Visa and MasterCard STULZ may extend credit to its customers a credit application must be prepared and approved this process could take one week A 25 minimum restocking charge will be applied on returned stocked parts that were sold as spare replacement parts If the returned part is not a stocked item a 5096 restocking charge may be applied Additionally a Return Material Authorization Number is required when returning parts To receive credit for returned repair replacement parts the parts must be returned to STULZ within 30 days of the purchase date Spare part sales over 30 days old will be considered final and the parts will remain the sole property of the ordering party April 2013 STUILZ DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 6 0 DRAW
26. e may fail The transducers should be replaced using the estimated lifetime of 10 000 to 15 000 hours as the point of reference If the cause cannot be located through the above checking please contact STULZ Product Support If the humidification system is supplied with a water conductivity sensor optional ensure the sensor is operating properly and that the supply water is within the recommended guidelines for mineral content 4 7 April 2013 STUILZ DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manua 4 4 Common Repairs Parts Replacement When parts are replaced refer to sections 4 4 1 Preparation for Repairs and 4 4 2 Re assembling 4 4 1 Preparation for Repairs Removal of Water Tank 1 Stop the humidifier set the power supply circuit breaker main switch to Off and close the water supply valve 2 Drain the water tank 3 Remove the air flow guide water tank cover mounting screws from the top of the humidifier and remove the air flow guide Photo 17 4 Remove the water tank mounting screws from the humidifier fan casing Photo 18 5 Lift the water tank from the base and place it on a well lit work surface for removing replacing the parts Photo 19 6 The transducers are visible when you rotate the tank to view the bottom Photo 20 7 The nebulizer print plates are on the side of the tank adjacent to the transducers Photo 21 4 4 2 Re assembling 1
27. e top of the humidifier 4 Remove the screws 4 Pcs holding the electrical box access cover Photo 4 5 Remove the electrical box access cover Photo 5 Inspect the interior and check the following No water leakage from the solenoid valve joint No damage to electrical wires or cables No abnormality of parts April 2013 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 6 Remove the terminal connectors 3 Ea from the sides of the level control board Photo 6 7 Slide the board out and ensure there is no discoloration deformation or deterioration of the printed circuit Photo 7 If any defects are found with the electrical parts take necessary steps referring to Sect 4 4 Common Repairs Parts Replacement 4 2 4 Float Switches 1 Loosen and remove the float panel mounting screws 2 Pcs Photo 8 Note Don t let the screws drop into the tank 2 Lift the float panel out and turn it over Photo 9 3 Check for contamination Manually operate the two float switches ensuring they raise and lower smoothly Clean any build up from the two float switches with a small brush Photo 10 Note Be careful not to remove the float portion from the stem 4 If no defects are found through the above inspection re assemble by reversing the above procedure Note When assembling be careful not to pinch the wires between the sheet metal April 2013
28. embling re assemble the unit by reversing the procedure described in Section 4 4 1 Screw Terminal Connector 4 9 April 2013 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 4 4 4 Replacing a Transducer 1 Referring to Section 4 4 1 Preparation for Repairs place the water tank on a well lit work surface 2 To replace a transducer remove the two transducer lead wires yellow and orange from the nebulizer print plate Photo 26 Note Grasp the terminals when removing wires Never pull the lead wires 4 Using a 5 5 mm nut driver remove the transducer mounting nuts 2 Pcs and remove the transducer spacer and o ring Save the nuts to mount the new part Photo 27 5 Clean the spacer o ring groove and o ring 6 Assemble the new transducer with the spacer and o ring and install them with the saved mounting screws Photo 28 Notes Ensure the o ring is not damaged If it is damaged replace it with a new one Carefully align the transducer s rubber packing in the indent in the bottom of the water tank to prevent leakage The mounting screws must be evenly tightened Do not overtighten 9 7 Connect the lead wires to the nebulizer print plate The colored lead wires must be inserted as shown on the plate Orange wire to ORG Yellow wire to YEL 8 Referring to Sect 4 4 2 Re assembling re assemble the unit by reversin
29. g the procedure described in Section 4 4 1 April 2013 4 10 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 4 4 5 Replacing a Nebulizer Print Plate 1 Referring to Section 4 4 1 Preparation for Repairs place the water tank on a well lit work surface 2 Using a 5 5 mm nut driver remove the print plate mounting nuts 2 Pcs and remove the plate Save the nuts and insulating parts to mount the new print plate Photo 29 3 Remove the four wires connected to the terminals from the plate to be replaced Photo 30 4 Install the new plate together with the silicon sheet provided using the saved mounting screws Photo 31 5 Connect the nebulizer print plate interconnecting wires black to H white to G and transducer lead wires orange to ORG yellow to YEL Note When the nebulizer print plate is replaced it is recommended that the transducer be replaced also 6 Referring to Sect 4 4 2 Re assembling re assemble the unit by reversing the procedure described in Section 4 4 1 4 4 6 Water Solenoid Valves Float Switches and Level Control Board 1 Referring to Section 4 2 2 Electrical Parts and 4 2 3 Float Switches remove the electrical access cover and lift the float panel out Photo 32 2 Cut the band bundling the solenoid valve and float switch lead wires Note Be careful not to damage the lead wires 3 Unscrew the connecting wires of t
30. g to the following tables As a rule power must be turned off when troubleshooting is performed but if it is absolutely necessary to troubleshoot when power is supplied special attention must be paid to avoid electric shock and short circuiting 1 First the humidifier and its surrounding area should be checked No mist is Power supply Control box switch turned Visually check switch Turn switch on generated system off position No power to the power Measure the voltage Supply power supply at power supply input terminals Measure the voltage Replace the at power supply output power supply terminals Water supply system Water supply valve is Check if the valve is Open the valve closed opened or closed Temperature sensor Check if ambient tempera Correct detects overheating ture and water temperature are within specified range Faulty power supply Amount of mist is Power supply system Supply voltage is low Check voltage at power Correct the voltage too low supply output terminals with the adjustment screw on the power supply Water supply control Operating water level is Visually check See table 3 o system high and overflowing next page Humidifier is not level is not level Visually check check Comet filter clogging Eo MN out the filter and LI the filter visually check Mist supply is Power supply system Supply voltage is high Check voltage at power coarse supply output terminals
31. he parts to be replaced from the terminal connectors on the level control board 4 4 6 1 Fill Solenoid Valve 4 To replace the fill solenoid valve remove the pipe fitting from the inlet side of the solenoid valve 5 Turn the float panel over and remove the solenoid valve mounting screws 2 Pcs Photo 33 6 Remove the elbow on the outlet side and install the new solenoid valve on the outlet side Be sure to seal the fitting with teflon tape 4 11 STLILZ April 2013 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual Note Ensure the elbow is facing the correct direction 7 Install the new solenoid valve to the float panel and re install the pipe fitting Note Ensure the o ring is not damaged If it is damaged replace it with a new one 4 4 6 2 Float Switch 8 To replace a float switch remove the lock nut on the float switch and replace the switch with a new one ref Photo 10 4 4 6 3 Level Control Board 9 To replace the level control board remove the lead wire terminal connectors 3 Pcs from the board see Photos 6 amp 7 Note Grasp the connectors when removing Never pull the lead wires 10 Slide the level control board out along the guides Remove it and install a new one Photo 34 4 4 6 4 Drain Solenoid Valve 11 To replace the drain solenoid valve remove the humidifier fan casing as described in Section 4 2 5 and lay it on it s
32. hnology Systems Inc warrants to the original buyer of its products that the OK goods are free from defects in material and workmanship Stulz Air Technology Systems Inc s obligation under this warranty is to repair or replace at its option free of charge to the customer any part or parts which are determined by Stulz Air Technology Systems Inc to YZ defective for a period of 24 months from date of shipment when a completed start up form has been submitted to Stulz Air Technology Systems Inc within 90 days from shipment In 2 the event that a completed start up form is not received by Stulz Air Technology Systems Inc within 90 days from shipment the company s obligation will be for a period of 12 months from date of shipment Parts repaired or replaced under this warranty are shipped FOB Factory SK and warranted for the balance of the original warranty period or for 90 days from the date of v OIRO o o O gt o o v gt v OK v O gt o O v o v o OIRO OQR gt installation whichever is greater O o O gt Stulz Air Technology Systems Inc s warranty does not cover failures caused by improper installation abuse misuse misapplication improper or lack of maintenance negligence accident normal deterioration including wear and tear or the use of improper parts or impro
33. is turned off and after a few seconds time delay to eliminate the remaining mist from the humidifier the Fan is turned off Proportional control is accomplished by the microprocessor monitoring the proportional signal from the Modbus or proportional input depending on which model was purchased When the proportional signal is greater than 1096 of the maximum input the microprocessor will turn the Solid State Relay on and off in a pulse width modulation control The period of the pulse width is 1 second For 1096 control the Solid State Relay is turned on for 0 1 second and off for 0 9 second The on time increases as the input approaches 100 At 100 the Solid State Relay is on continuously April 2013 Safety control is built into the microprocessor The voltage applied to the transducer affects the amount of mist produced Too high a voltage can cause damage to the transducer and too low a voltage prevents mist from being formed The microprocessor monitors the 48 VDC to be within a range of voltages If the voltage is out of range the microprocessor will not energize the Solid State Relay If the temperature of the tank rises too high the microprocessor turns off the Solid State Relay If the temperature approaches freezing the microprocessor turns off the Solid State Relay and the fan and then drains the tank to prevent damage from freezing water When the temperature returns to a safe level normal operation is resume
34. l Controller The Level Controller is a microprocessor based device located in the electric box that receives inputs from sensors and other inputs and in turn controls the valves fan and Ultrasonic Nebulizer Units It consists of a DC DC power supply to convert the 48VDC to 24VDC for the fans and solenoids and a further reduction to 5VDC for the microprocessor sensors power switches and either a Modbus interface to communicate with the Ultra Series Controller or a simple standalone input interface depending on which model humidifier was purchased The 48 VDC must be present at all times to allow the Level Controller microprocessor to monitor the inputs and control the outputs The microprocessor monitors the on off command from either the Modbus or the input dry contact depending on which model was purchased If commanded on the microprocessor checks the Low Water Float Switch and the High Water Float Switch If the water is too low the microprocessor turns on the Water Fill Valve Solenoid and monitors the Float Switches When the water level is above the low water level the fan is turned on When the water level is above the high water level the Water Fill Valve Solenoid is turned off and the Solid State Relay is turned on When the water level falls below the high water level the microprocessor turns the Water Fill Valve Solenoid on again to maintain optimal water level When the on off command is removed the Solid State Relay
35. minals X2 1 amp X2 2 on the printed circuit board is 24 VDC Float switch for low With the water tank filled If there is no continu water level is faulty with water remove the ity replace the switch wire from terminal X3 t Float switch for on the printed wiring Clean the switch If low water level is board and check conti operation is not re sticking nuity of float switch stored replace switch Fan lead wires are Open the electrical Correct loose or disconnected Section and check the terminations from the terminals lead wire connecting terminals Amount of mist Water supply Water supply float If the water level in the tank If there is continuity is too low system switch is faulty is up to the overflow pipe replace the switch overflowing remove the wire from ter t Water supply float minal X3 on the printed Clean the switch Switch arm Sticking circuit board and ensure If operation iS not there is no continuity restored replace the float switch switch Water supply Overflowing occurs even Replace the solenoid valve is after power is turned off solenoid valve faulty 4 Consumable parts No mist output Deterioration of transducer due The life is about 10 000 to Replace the transducer or mist output is to aging 15 000 hours of humidifier too low operation Remarks If the humidifier is operated for a long time with a deteriorated transducer the nebulizer print plat
36. ons applicable through out the manual Prior to performing any installation operation maintenance or troubleshooting procedure read and understand all instructions recommendations and guidelines contained within this manual WARNING High voltage is used in the operation of this equipment Death on contact may result if personnel fail to observe safety precau tions CAUTION This unit must be installed according to local and national electric codes CAUTION All maintenance and or repairs must be per formed by a qualified technician All person nel working on or near equipment should be familiar with hazards associated with electrical maintenance CAUTION Always turn off the main power and unplug the unit before beginning work on the equipment NOTE Wiring terminations may become loose during transit of the equipment therefore verify all wir ing terminations are secure prior to operation NOTE Do not attempt to make repairs without the proper tools April 2013 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual NOTE STULZ offers no warranty protection on humidification systems using controls that are not provided by STULZ CAUTION It is essential that De ionized DI or Reverse Osmosis RO water be used as the supply water source to maintain full warranty cover age The use of untreated water will VOID THE WARRANTY CAUTION
37. pecially residue from evaporation oH total hardness and water conductivity exceeds or is outside the range of standard routine maintenance intervals to ensure continuous operation will be more frequent than usual Also the operating life of the transducers and print plates will be significantly reduced April 2013 2 2 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual CAUTION It is essential that DI or RO water be used as the supply water source to maintain warranty coverage The use of untreated water will VOID THE WARRANTY NOTE The water supply piping must be non corrosive stainless steel or poly tubing rated for use with de ionized water Prepare the water supply piping The water supply piping should be equipped with a water supply valve for maintenance purposes user provided at a place as close as possible to the humidifier The valve must be rated for use with DI water After the water supply valve is installed flushing should be done by supplying water see Section 3 1 Purge the Water Line This is a necessary step to prevent chips and oil in the piping from entering the humidifier Locate the water filter strainer assembly shipped loose and apply teflon tape to the threaded end Ensure the tape does not extend over the first two threads on the fitting to prevent any pieces of tape from entering the water stream Hand screw the filter strainer a
38. per repair 2 v o LY oO v o OIRO OKQO KXK Purchaser s remedies are limited to replacement or repair of non conforming materials in ac cordance with the written warranty This warranty does not include costs for transportation costs for removal or reinstallation of equipment or labor for repairs or replacement made in the field v v ie v o OIRO v O o O o If any sample was shown to the buyer such sample was used merely to illustrate the general type and quality of the product and not to represent that the equipment would necessarily K conform to the sample 9 o gt v OIRO This is the only warranty given by the seller and such warranty is only given to buyers for commercial or industrial purposes This warranty is not enforceable until the invoice s is WZ paid in full Sd THE FOREGOING SHALL CONSTITUTE STULZ S ENTIRE LIABILITY AND YOUR EXCLU REMEDY EVENT SHALL STULZ LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL CONSEQUENTIAL OR EXEMPLARY DAMAGES INCLUDING SZ LOST PROFITS EVEN IF ADVISED OF THE POSSIBILITY THEREOF ARISING IN ANY WAY OUT OF THE INSTALLATION USE OR MAINTENANCE OF THE EQUIPMENT THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUD SK ING WARRANTIES OF MERCHANTABILITY OR FITNESS FORAP
39. se dimensions see the installation drawing provided with your unit Figure 2 Locating the Humidifier 3 0 MIN SMOKE CEILING DETECTOR 12 7 AIR DIFFUSER 8 00 gt 5 HUMIDIFIER PATH ucc b E CMM MOUNTING BRACKET SUPPORT BRACKET NOTE Humidity control can only be achieved in a sealed room or if the room has vapor barriers installed It is recommended that walls ceilings and floors be sealed to prevent migration of humidity 2 3 Mounting Placement STULZ ultrasonic humidifiers are designed for mounting to a flat surface Ensure the base is capable of support ing the weight of the unit Weight estimates can be found on the installation drawing provided with your unit Secure the unit with fasteners field supplied by others so that it will not move during operation Ensure the front edge of the humidifier is not hanging over the edge of the support bracket 2 4 Supply and Drain Piping The humidifier will require a field installed water supply line and drain line Refer to the piping diagram provided with your unit for details For the water supply use DI or RO water The water supply to the humidifier cannot be taken directly from the public water service Untreated supply water will leave a residue in the conditioned space where white powder is produced after evaporation from the calcium or magnesium which is dissolved in the water In cases where water quality es
40. side Photo 35 12 Using a 5 5 mm nut driver remove the nuts holding the two valve outlet adapters Unscrew the adapters from the solenoid valve and screw them into the replacement part Photo 36 13 Referring to Section 4 4 2 Re assembling assemble the unit by reversing the procedure described in Section 4 4 1 April 2013 4 12 5 1 Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 5 0 PRODUCT SUPPORT STULZ provides its customers with Product Support which not only provides technical support and parts but the following additional services as requested e Performance Evaluations e Start up Assistance e Training STULZ recommends using the services of our Field Service Department to perform start up and commissioning They will ensure your equipment is correctly installed and operating properly This will help ensure your unit provides years of trouble free service while operating at it s highest efficiency 5 1 Technical Support The STULZ Technical Support Department is dedicated to the prompt reply and solution to any problem encountered with a unit Should a problem develop that cannot be resolved using this manual you may call 888 529 1266 Monday through Friday from 8 00 a m to 5 00 p m EST If a problem occurs after business hours provide your name and telephone number One of our service technicians will return your call When calling to obtain suppor
41. ssembly into the water inlet fitting in the side of the humidifier until some resistance is felt Then using an open end wrench on the reducer fitting screw the assembly 1 full turn to fully tighten it DO NOT tighten the filter strainer by grasping the plastic body The filter strainer is equipped with a compression fitting see Figure 3 Connect the water supply piping to the humidifier by means of a 1 4 stainless steel or poly tubing user provided Use two adjustable wrenches to tighten the connection on the humidifier Tightening torque approximately 90 in lIbs If there is a risk that the water supply piping could freeze wrap the piping with insulating material Figure 3 Water Inlet Filter Strainer Figure 4 Piping Connections F LOW Water Supply Valve APO Nl sk E Water Supply Piping Water Supply Filter Strainer Drain Line k Humidifier Compression Fitti ng Provided By User To Drain Include Air Gap A drain line rated for use with DI water must be provided from the 1 8 NPT water tank drain stub in the side of the unit Connect the drain line to the stub so that overflowing water can be directed into a drain pan or an appropriate place such as an open building drain with an air gap per local and national plumbing codes The drain line must meet local and national plumbing codes be sloped downward and away from the humidifier include and air gap and the end should not be ob
42. structed 2 3 April 2013 DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 2 5 Main Power And Control Wiring For wiring refer to the electrical drawing supplied with your unit to determine the total number of inter connecting conductors required for your system and for the proper wire terminations For internal wiring of the humidifier see the Electrical Circuit Diagrams Section 6 2 NOTE Wiring terminations may become loose during transit of the equipment therefore verify all wiring terminations are secure prior to operation Verify that the main power supply to the control box coincides with the voltage phase and frequency information specified on the nameplate The nameplate also provides the full load amps FLA the current that the unit will draw under full design load the minimum circuit ampacity MCA for wire sizing and the maximum fuse size MFS for circuit protection The power source must be provided with a circuit breaker for safety Ensure a ground is connected to the unit The humidifier is rated to operate with a nominal input of 48VDC To maintain warranty coverage never allow the humidifier input voltage to exceed 51 volts as damage will occur to the transducers and print plates 2 5 1 Wire Sizing From Control Box to Humidifiers The following table indicates the correct electrical wire sizing from the control panel to the humidifiers for three different distan
43. t it is important to have the following information readily available information is found on the units nameplate e Unit Model Number DRH XX e SIULZ Sales Order Number e Unit Serial Number e Description of Problem 5 2 Obtaining Warranty Parts Warranty inquiries are to be made through the Technical Support Department at 888 529 1266 Monday through Friday from 8 00 a m to 5 00 p m EST A service technician at STULZ will troubleshoot the system over the telephone with a field service technician to determine the defect of the part If itis determined that the part may be defective a replacement part will be sent via UPS ground If the customer requests that warranty part s be sent by any other method than UPS ground the customer is responsible for the shipping charges If you do not have established credit with STULZ you must give a freight carrier account number A written or faxed purchase order is required on warranty parts and must be received prior to 12 00 p m for same day shipment The purchase order must contain the following items e Purchase Order Number e Date of Order e SIULZ Stated Part Price e Customer Billing Address e Shipping Address e Customer s Telephone and Fax Numbers e Contact Name e Unit Model No Serial No amp STULZ Item No The customer is responsible for the shipping cost incurred for returning the defective part s back to STULZ Return of defective part s must be within 30
44. tank when energized by the Level Controller There is an orifice to restrict the flow of water 1 6 8 Water Supply Valve To be provided by the user A valve must be installed upstream from the humidi fier for service and maintenance The valve must be rated for DI water 1 6 9 Water Supply Tubing To be provided by the user Water supply tubing must be provided to connect the water supply to the water filter strainer in the back of the unit The filter strainer is equipped with compression fitting Utilize 4 stainless steel or poly tubing rated for use with water 1 6 10 Drain and Overflow Assembly The Drain and Overflow Assembly contains a 24 VDC drain solenoid valve an overflow pipe and a drain outlet The drain valve solenoid is controlled by the Level Controller to drain water from the tank via the drain outlet If the water level in the tank exceeds the height of the overflow pipe the excess water is diverted to the drain outlet 1 6 11 Temperature Sensor The temperature sensor monitors the temperature of the tank and is read by the Level Controller which prevents overheating and freeze protection April 2013 STUILZ DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual 1 6 12 Solid State Relay The 48 VDC operating voltage for the Ultrasonic Nebulizer Units is switched on and off by a solid state DC relay controlled by the Level Controller 1 6 13 Leve
45. ts reserved Stulz Air Technology Systems Inc 1572 Tilco Drive Frederick MD 21704 USA DRH Series GEN1 Ultrasonic Humidifier Installation Operation amp Maintenance Manual TABLE OF CONTENTS 1 0 Introduction ectetur OE 1 1 4 2 1 Air TUBE 4 3 1 1 1 1 4 2 2 Water Supply 4 3 1 2 cci AET E E EE E t f 42 9 0 4 3 1 2 1 Gerieral ti 424 tutem iea 4 4 1 2 2 Safety Summary 1 1 425 Water 4 5 1 3 Product Warranty y 13 2 6 MISLGOUIGIOS enirn tote neat ine tato gentis 4 5 1 4 1 4 4 3 Troubleshooting and 4 6 1 5 General 1 5 4 4 General Common Repairs Parts 1 6 Main 1 5 Replacement 4 8 1 6 1 Ultrasonic Nebulizer Unit 1 5 441 For 4 8 1 6 0 Mist Guide 1 5 44 2 Reassembling eee 4 8 1 6 3 High Water Float 1 5 443 Replacing the Temperature Sensor 4 9 1 6 4 Low Water Float Switch 1 5 444 Replacing a
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