INDEX 71.1-2 Edition 2.97 AIRCONDITIONING ULTRASONIC / ENS TECHNICAL MANUAL - ENS
TABLE OF CONTENTS Page 1. Operation 4 2. Technical Data ENS Series 5 2.1 Humidifier Path 6 2.2 Dimensioned Drawings 7 2.3 Description 9 3. Capacity Calculation for Ultrasonic Humidifiers 11 3.1 Questionnaire Ultrasonic Humidifiers 18 4. Control System 20 4.1 Set-up of ON/OFF Control 21 4.2 Set-up of Proportional Control 26 4.3 Function of Proportional Adapter 31 4.4 Connecting Lines between the Humidifiers 34 and the Control System 4.5 Electrotechnical Information ENS 1200-9600 36 ON-OFF 2
TABLE OF CONTENTS Page 4.6 Electrotechnical Information ENS 14-18 37 5. Assembly, Start-up and Limitations 38 5.1 Assembly ENS Series 39 5.2 Installation Examples for Humidifiers ENS 60 5.3 Start-up of Humidifiers ENS 63 5.4 Precautions during Operation 65 6. Accessories 67 6.1 Data Sheet Safety Transformers 67 6.2 Information Regarding the Conductimeter 68 7. CE - EMC law 7.1 Information about the EMC law 70 according to CE-guidelines 3
OPERATION 1. Operation STULZ Ultrasonic humidifiers operate on the principle of ultrasonic nebulization. A 48 V a.c. voltage is rectified on an oscillator circuit and transferred into a high frequency signal of 1.65 MHz. This signal is transmitted to an oscillator (transducer) installed in the water bath, which then transfers this signal into high frequency automatic vibrations. The built-in oscillators are so-called thickness oscillators which in accordance with the signal of 1.65 MHz applied change their thickness 1.65 million times per second. The surface of the transducer oscillates at such a high speed that the water cannot follow because of its inertia of masses; therefore, immediately after the unit has been switched on, a water column is generated above the oscillators. During the negative amplitude of the oscillator, an instantaneous vacuum is produced because of the fact that the water cannot follow the faster oscillator movements. Cavitation produces bubbles, which are "catapulted" to the edge of the water column during the course of the positive amplitude and which collide there with great force. During this procedure, finest water particles are being atomized at the edge of the water column. Due to the focussing of the sound waves, cross waves are produced directly underneath the water surface, in the centers of which smallest water droplets are separated and generate a mist, which is immediately absorbed from the air stream. 4
TECHNICAL DATA ENS TYPE 2. Technical Data ENS Type The Ultrasonic humidifier type ENS operates on the principle of utrasonic nebulization. The humidifier is intended for installed in compact air-conditioning units, box-type units and intake air ducts. It contains the nebulization modules with water supply valve/solenoid valve and float switch. Type ENS ENS ENS ENS ENS ENS ENS ENS ENS ENS 1200 2400 3600 4800 6000 7200 8400 9600 14 18 Output 1.2 2.4 3.6 4.8 6.0 7.2 8.4 9.6 14 18 (l/h) 2x7.0 2x9.0 No. of 2 4 6 8 10 12 14 16 24 30 Oscillators Trans- Primary: 110V / 208V / 230V / 400V / 460V ±15 V former 50/60 Hz Secondary: 12V / 24V / 36V / 42V / 48V / 52V No. Power 65 125 185 240 310 375 435 495 750 960 (W) Transf.Out. 160 160 320 320 320 500 500 500 1300 1300 (VA) Weight 1.5 2.2 2.9 3.6 4.3 5.1 5.8 6.5 11 13 (kg) Dimension 220 340 460 580 700 820 940 1060 785 950 L (mm) Dimension 120 240 360 480 600 720 360 480 730 895 P, P1, P2 (480) (480) (mm) Subject to technical modifications./* output at: water level 40mm, air temp. 26 C, water temp. 26 C, voltage 48V. Working condition: Water supply: Air temperature 8 C bis 40 C, relative humidity below 90% The feed water supplied into the humidifier must be <20µS/cm. Water pressure should be between 0.2 bar and 6 bar. The water temperature should be between 5 C abd 40 C. 5
TECHNICAL DATA ENS SERIES 2.1 Humidifier Path The length of the humidifier path is dependent on different factors. - even distribution of the mist in the airflow - air temperature - relative air humidity - air speed The following diagram for the determation of the humidifier path contains standard values dependent on the most important parameters. (Air temperature 18 C to 24 C). The tolerance is approx. ± 0.5 m. If no place is available for the humidifier path, use of a mist collector is possible. The smaller the distance to the mist collector, the larger the loss effect of the humidifier and the more water is drained off into the pan, which has to be drained off for hygienic reasons. Another possibility to reduce the humidifier path is the employment of a proportional control. With this control, the output of the humidifiers is reduced dependent on the requirements in more than 90% of the operating time and therefore reduces the humidifier path, saves the oscillators and maintains an even distribution of the mist even in operation under partial load. 6
TECHNICAL DATA ENS SERIES 2.2 Dimensioned Drawings Unit Assembly ENS 1200-9600 Dimensions L, P, P1, P2 refer to page 5 "Dimensions" Legend 1 Water supply module 2 Nebulizing module 3 Mist collector 4 Electric supply* 5 Cable socket 6 Water supply line* 7 Safety overflow 8 Water drain 9 Installation base * to be supplied by customers 7
TECHNICAL DATA ENS SERIES Unit assembly ENS 14-18 Dimensions L, P refer to page 5 "Dimensions" Legend: 1 Water supply module l 7 Water supply line* 2 Mist collector 8 Safety overflow 3 Metal plug 9 Water drain 4 Cable 10 Installation base 5 Metal plug 11 Check valve* 6 Cable * to be supplied by customers 8
Unit Description ULTRASONIC TECHNICAL DATA ENS SERIES 2.3 Safety Appliances Automatic feed water control with solenoid valve and float switch. Preventive protection against dry-running; if water level falls below a set level, float switch and relay are automatically activated in order to cut off power supply. The thermostat will automatically cut off power supply if temperature in the humidifier gets higher than the setpoint. For further protection, fuses and varistors have been installed to protect the electronic parts. Description of main components 1. Humidifier ENS 1200-9600 The humidifier consists of water tanks that are linked together and used for the nebulization and control of the water supply. The nebulization module is equipped with oscillation converters. The tank, built-in for control of water supply, is equipped with all necessary devices for supply and control, such as relay, solenoid valve and float switch. 2. Humidifier ENS 14-18 Utrasonic nebulization modules, the solenoid valve and the float switches are installed in a stainless steel casing. 3. Nebulization Module Oscillators and amplifying circuits are installed at the bottom of each of these compact units. 48 Volt a.c. are being applied to an oscillating circuit and are amplified to high frequency performance, so that the oscillator (transducer) is set to automatic vibrations. The generated ultrasonic waves are then directed to the water surface and, as a result, the water is being atomized. 9
TECHNICAL DATA ENS SERIES 4. Water Supply Solenoid Valve and Float Switch In order to achieve optimum nebulization of the water, the water level in the tanks has to be kept as constant as possible. To meet these requirements, a solenoid valve and a float switch are used for automatic water supply. If the water level in the tank falls below the standard level, the float switch will turn to ON and the solenoid valve opens to fill the tank with water. As soon as the standard water level has been reached, the float switch will turn to OFF again and the solenoid valve is closed. 5. Relay (externally installed in control box) and Float Switch (dryrunning Protection) Should the humidifier be operated with a water level in the tank being too low, the oscillator will be damaged. To avoid any dry-running, a float switch is inserted. If the water level falls below the safety level - for any reason whatsoever, the float switch turns to OFF, activates the external relay which is installed on the supply board and cuts off the electric power supply to the oscillators. 10
CAPACITY CALCULATION FOR ULTRASONIC HUMIDIFIERS 3. Capacity Calculation for Ultrasonic Humidifiers Basis of the capacity calculation for ULTRASONIC humidifiers is the questionnaire listed under chapter 3.1. Provided that this questionnaire has been completely been filled in, it will contain all data necessary for the calculation. Example 1: LE = Air intake before humidification = 31.5 C / 10% r.h. LA = Air outlet after humidification = 18.0 C / 50% r.h. Air volume = 10.000 m³/hour These values have to be chosen for the most unfavorable conditions, which usually exist in winter at lowest outer temperatures. 1. 2. 3. 4. 5. The two air conditions are entered into the h-x digram (point A and point B Draw a vertical line from A to edge measurement "x" point C Draw a vertical line from B to edge measurement "x" point D Then calculate the humidifier output: >Point C = 2.8 g/kg air >Point D = 6.4 g/kg air >Difference = 3,6 (g Water)/(kg air) ( D - C ) >Multiply the predetermined air volume (10.000 m³/hour) with the average air density (1,18 kg/m³) 10.000 m³/hour x 1,18 kg/m³ = 11.800 kg/hour >Multiply the difference of the water content in the air with the air weight/hour 3,6 g/kg x 11800 kg/hour = 42.480 g/hour humidifier output = 42,5 kg/hour The most favorable type of combinations is now chosen from the delivery range. The most frequent selection criteria are: >Length of the ENS humidifier at the predetermined depth of the air treatment. >Number of ENS humidifiers, because of number of fixing fixing divices, water supply lines and electric control. In the example given, 2 off ENS 14 have been chosen. ( 3 x 14 kg/hour = 42 kg/hour ) 11
CAPACITY CALCULATION FOR ULTRASONIC HUMIDIFIERS 6. Determine the net cross section and the air speed in the duct or air treatment unit > Determine the free cross section for the air treatment unit from manufacturers' information. For the calcualtion example: Height: 1100 mm Depth: 1300 mm Height x deptch = 1.1 m x 1.3 m = 1.43 m² cross section > Determine the reduction of the free cross section caused by the humidfiers Type ENS 1200 ENS 2400 ENS 3600 ENS 4800 ENS 6000 ENS 7200 ENS 8400 ENS 9600 ENS 14 ENS 18 C.Sectiont 0,035 m² 0,053 m² 0,072 m² 0,091 m² 0,11 m² 0,129 m² 0,148 m² 0,166 m² 0,137 m² 0,166 m² Example: 1,43 m² - (3 x 0,137) = 1,02 m² = free cross section under consideration of the three humidifiers ENS 14 > Determine the air speed Air volume (m³/h) / 3600 = m³/s m³/s free cross section (m²) = m/s Example: 10.000 m³/h 3.600 2,78 m³/s 1,02 m² = 2,78 m³/s = 2,73 m/s The calculated air speed of 2,73 m/s is within the permissible limits of 1,5-3 m/s. 12
CAPACITY CALCULATION FOR ULTRASONIC HUMIDIFIERS (6.4-2.8)g/kg x 10000 m³/h x 1.18 kg/m³ = 42480 g/h = 42.5 kg/h 13
CAPACITY CALCULATION FOR ULTRASONIC HUMIDIFIERS 7. Determination of the Humidifier Path The length of the humidifier path is dependent on different facors: - Even distribution of the mist in the airflow - Air temperature - Air relative humidity - Air speed The following diagram for the determination of the humidifier path contains experience values dependent on the most important parameters. The diagram is valid for the temperature range from 18 C to 24 C. Should no place be available for the humidifier path, the use of a mist collector is possible. The smaller the distance to the mist collector, the larger the loss effect of the humidifier and the more water is drained off into the pan, which has to be drained off for hygienic reasons. 14
CAPACITY CALCULATION FOR ULTRASONIC HUMIDIFIERS As the dimensioning of the humidifier output is always made for the most unfavorable operating status, the humidifier is over-dimensioned in up to 90% of the operating time. (In a comfort air conditioning unit, the dimensioning is made for the lowest temperature in winter, which usually occurrs during the night and usually does not last for more than 10 hours/year). A proportional control reduces the output to more than 90% of the operating time of the humidifier according to demand and thus reduces the humidifier path, and therefore saves the oscillators and maintains an even distribution of the mist also in operation under partial load. 2. Example Humidification of an office room Humidification of an office room with Ultrasonic humidifiers installed in the air intake duct (recirculating operation with outer air portion) - Volume flow V L = 2000 m³/h - Outer air condition in winter L W = -10 C / 90 % r.h. - Desired ambient temperature L R = 20 C / 60 % r.h. - Outer air portion 50% The air conditions L W and L R are drawn into the h-x diagram and both points are connected with each other. 15
CAPACITY CALCULATION FOR ULTRASONIC HUMIDIFIERS The mixing point for the outer air percentage 50% is half of the connecting straight line between L W and L R. From the mixing point M and from L R a perpendicular is drawn at the upper edge of the h-x diagram. On basis of the perpendicular line at point M, a water content of 5.2 g/kg and, at point L R of 8,8 g/kg can be determined. This results in an x of 8.8 g/kg - 5.2 g/kg = 3.6 g/kg. This means that 3.6 g of water per kg hourly recirculated air have to be provided. The mass of the hourly recirculated air results from the volume flow (2000 m³/h) multiplied by the specific weight ρ of the air (1,20 kg/m³). V L x ρ = 2000 m³/h x 1,20 kg/m³ = 2400 kg/h As 3,6 g of water have to be added hourly per kg of air, the output of the humidifier can be calculated as follows: 2400 kg/h x 3.6 g/kg = 8640 g/h 16
CAPACITY CALCULATION FOR ULTRASONIC HUMIDIFIERS Note: STULZ ULTRASONIC humidifiers atomize water into smallest water droplets (< 0,001 mm). The mist (aerosols) generated takes away heat from the ambient air (enthalpy) and changes its state of aggregation from liquid to gaseous. Because of this "adiabatic" behavior (heat absoption from the ambient air), the ambient air in cooled down. Example: - Air conditon before humidification: Temperature 25 C relative humidity 30 % - Moisture addition of x= 3 g/kg Condition of the air after humidification: Temperature 18 C relative humidity 70 % 17
QUESTIONNAIRE FOR ULTRASONIC HUMIDIFIERS 3.1 Questionnaire for Ultrasonic humidifiers For planning of a STULZ ULTRASONIC humidification system, please make use of the questionnaire shown in the following. 18
KLIMATECHNIK GmbH ULTRASONIC 19
CONTROL SYSTEM 4. Control System For operation of the Ultrasonic humidifiers, an external control box has to be provided. Together with the transformer required for operation, contactor relays, the main switch, strip terminals and the proportional adapter, if required, controller or the conductimeter have to be integrated into the control box. Control of the humidifiers can either be ON/OFF control, continuous or proportional control. The control system should be suitably adapted to the project in question. When the control box is wired, the suppressor diodes provided to protect the oscillators have to be connected in parallel with the oscillator boards. For all types, the provided contactor for the bath response (level indicator of water tank) has to be additionally used and to be connected with the RC module provided. Other contactors would destroy the float switch. Incorrect wiring of the control box may cause damage to the humidifier; the control boxes should therefore be wired in accordance with the wiring diagrams provided. The parts provided by STULZ are identified by "*" in the wiring diagram. The regulations of the local electric supply companies have to be observed. Concerning the CE requirements for the European Community please refer to page 70-73. The components mentionned on page 70-73 must be inserted in the wiring diagrams of this chapter. 20
SET-UP OF ON/OFF CONTROL 4.1 Set-up of ON/OFF Control The most simple mode of control is made by means of a hygrostat which compares the room humidity values (actual value) with the value adjusted (setpoint). If the actual value falls below the setpoint, the hygrostat will turn the humidifier to ON, if the value is higher, the unit is turned off. The control operation is run with a predetermined switching hysteresis around the setpoint. 21
Control Box with Hygrostat and Conductimeter Pre-alarm 5 µs Alarm 20 µs 15-300s Humidifier Ultrasonic - ENS 1200 Ultrasonic - ENS 2400 The parts supplied by STULZ are identified with *. Hygrostat conductimeter conductivity sensor Non screened cable max. 5m Screened cable max. 20m ENS 1200-2400 ON/OFF CONTROL 22
Control Box with Hygrostat and Conductimeter Pre-alarm 5 µs Alarm 20 µs 15-300s Humidifier Ultrasonic - ENS 3600 Ultrasonic - ENS 4800 Ultrasonic - ENS 6000 The parts supplied by STULZ are identified with *. Hygrostat conductimeter conductivity sensor Non screened cable max. 5m Screened cable max. 20m ENS 3600-6000 ON/OFF CONTROL 23
Control Box with Hygrostat and Conductimeter Pre-alarm 5 µs Alarm 20 µs 15-300s Humidifier Ultrasonic - ENS 7200 Ultrasonic - ENS 8400 Ultrasonic - ENS 9600 The parts supplied by STULZ are identified with *. Hygrostat conductimeter conductivity sensor Non screened cable max. 5m Screened cable max. 20m ENS 7200-9600 ON/OFF CONTROL 24
Control Box with Hygrostat and Conductimeter Pre-alarm 5 µs Alarm 20 µs 15-300s!! ATTENTION!! Filter ZAC 2210-00U and capacitator C1 following the CE-EMC guidelines (enclosed for EU) Humidifier Ultrasonic - ENS 14 Ultrasonic - ENS 18 The parts supplied by STULZ are identified with *. Hygrostat conductimeter conductivity sensor Non screened cable max. 5m Screened cable max. 20m ENS 14-18 ON/OFF CONTROL 25
SET-UP OF PROPORTIONALEN CONTROL 4.2 Set-up of Proportional Control For proportional control, the actual value is compared with the setpoint and the humidifier output is adjusted in accordance with the control difference. Proportional control consists of the humidity sensor, the continuous controller and the STULZ proportional adapter, which forms the interface between the humidifier and the control components. 26
Control Box with P-Adapter, Humidity Control and Conductimeter Pre-alarm 5 µs Alarm 20 µs 15-300s Proportional-Adapter line 0,6 sqmm max.120m line 1,0 sqmm max.300m Humidifier Ultrasonic - ENS 1200 Proportional Ultrasonic - ENS 2400 Proportional The parts supplied by STULZ are identified with *. humidity sensor conductimeter conductivity sensor Non screened cable max. 5m Screened cable max. 20m ENS 1200-2400 PROPORTIONAL CONTROL 27
Control Box with P-Adapter, Humidity Control and Conductimeter Pre-alarm 5 µs Alarm 20 µs 15-300s Proportional-Adapter line 0,6 sqmm max.120m line 1,0 sqmm max.300m Humidifier Ultrasonic - ENS 3600 Proportional Ultrasonic - ENS 4800 Proportional Ultrasonic - ENS 6000 Proportional The parts supplied by STULZ are identified with *. humidity sensor conductimeter Non screened cable max. 5m Screened cable max. 20m conductivity sensor ENS 3600-6000 PROPORTIONAL CONTROL 28
Control Box with P-Adapter, Humidity Control and Conductimeter Pre-alarm 5 µs Alarm 20 µs 15-300s Proportional-Adapter line 0,6 sqmm max.120m line 1,0 sqmm max.300m Humidifier Ultrasonic - ENS 7200 Proportional Ultrasonic - ENS 8400 Proportional Ultrasonic - ENS 9600 Proportional The parts supplied by STULZ are identified with *. humidity sensor conductimeter conductivity sensor Non screened cable max. 5m Screened cable max. 20m ENS 7200-9600 PROPORTIONAL CONTROL 29
Control Box with P-Adapter, Humidity Control and Conductimeter Pre-alarm 5 µs Alarm 20 µs 15-300s!! ATTENTION!! Filter ZAC 2210-00U and capacitator C1 following the CE-EMC guidelines (enclosed for EU) Proportional-Adapter line 0,6 sqmm max.120m line 1,0 sqmm max.300m Humidifier Ultrasonic - ENS 14 Proportional Ultrasonic - ENS 18 Proportional The parts supplied by STULZ are identified with *. humidity sensor conductimeter conductivity sensor Non screened cable max. 5m Screened cable max. 20m ENS 14-18 PROPORTIONAL CONTROL 30
FUNCTION OF PROPORTIONAL ADAPTER 4.3 Function of Proportional Adapter 1. General The proportional adapter M 02719 (P- Adapter is a power device that changes its operating time proportionally dependent on four different controller inputs. 2. Function When the threshold value of 1.2 VDC (or 1.2 madc) is exceeded, the relay at terminal 13, 14 (refer to wiring plan, propartional adapter M02719) switches the water intake valve to ON, provided that the supply voltage of 12 VAC is fed to terminals 11 and 12. If bath response (water tank level) of 48 VAC/50 Hz is given to terminal 9 and 10 of the proportional adapter, the green LED illuminates. At the same time, the solid-state relay starts operating with an operating time of 10%. This is indicated by flashing of the red LED. With the DIP switches installed on the printed board of the proportional adpter, the operating cycles may be adjusted between 1 sec. and 3 sec. Oper. Cycles Position of DIP switches Switch (Second (s)) position 1 1=OFF 2=OFF 3=ON 4=ON UP=OFF 2 1=ON 2=OFF 3=ON 4=ON DOWN=ON 3 1=ON 2=ON 3=OFF 4=OFF An increasing value at the inlet of the proportional adapter causes an extension of the operating time of the outlet. All inlets are uncoupled. When the determined maximum value is achieved at one of the inlets, the operating time of 100% has been reached. 31
FUNCTION OF PROPORTIONAL ADAPTER 3. Technical Data Elektric power consumption: 1 W Power loss at 100% operating factor: 21 W (at 21 A eff) On-load voltage: 24-280 V eff Peak off-state voltage: 600 V Leak current (at 280 V eff): 8-15 ma eff Turn on/off procedure: No voltage release Electric strength of Potential separation: min. 2500 V eff Insulation resistance: 50 MOhm Operating temperature: 0... + 80 C Max. cooling body temperature: horizontal 63 C vertical 55 C 32
FUNCTION OF PROPORTIONAL ADAPTER Terminal Configuration Terminal 1 +0... 10 V DC reverse battery protected con- Terminal 2 GND troller input R in =20 kohm Terminal 3 +0...20 V DC reverse battery protected con- Terminal 4 GND } troller input R in =40 kohm Terminal 5 +0...20 ma DC reverse battery protected con- Terminal 6 GND } troller input R in =1 kohm Terminal 7 0...20 (30) V AC isolated controller input Terminal 8 GND } R in >150 kohm, via TP1* adjustable to 20/30 V Terminal 9 Bath response humidifier response Terminal10 Bath response } release by water level 48VAC/50Hz Terminal 11 Supply voltage 12 V AC supply voltage Terminal 12 Supply voltage } of P-adapter ~1W Terminal 13 Input 48 VAC no voltage relay contract Terminal 14 Output } for water intake valve Terminal A1 Input 48 VAC No voltage electronic no Terminal A2 Output } voltage a.c. zero voltage switch load 24...280 V AC/50 Hz 21 A steady load 40 A short-time load } * Adjustment TP 1 Left-hand stop: 0...30 V Right-hand stop: 0...20 V TP1 Power elektronics Terminals 33
Connecting Lines between Humidifiers and Control System 4.4 Connecting Lines between Humidifiers and Control System 1. ON/OFF Control ENS 1200 to 9000 Proportional Control ENS 1200 to ENS 9600 The line, length 4 m and preset, is connected to the control box according to the identifications given. In case the connecting line is extended, the dimensioning (refer to 5.) has to be taken into consideration. 2. ON/OFF Control ENS14 and ENS18 Proportional Control ENS 14 and ENS 18 The cables, length 2 m and preset, provided with plugs are plugged into the sockets provided at the units and are screwed down. In case the connecting line is extended, the dimensioning (refer to 4.) has to be taken in consideration. 3. Preset Line ENS 14 and ENS18 34
Connecting Lines between Humidifiers and Control System 4. Cable Dimensioning The connecting cable between the humidifier and the control vox (transformer) reduces the voltage at the humidifier and corresponds to the following formula: 35,6 x L x I i = 1000 x A i L I A = Voltage loss [V] = Cable length [m] = Current intensity [A] = Cable cross section [mm²] If the voltage loss between the control bos and the humidifier is smaller or equal 4%, the voltage is still within the tolerance range. If the value falls below this voltage, a larger cable cross section in accordance with the table has to be chosen or the voltage has to be connected at transformers secondary side to 52 VAC. Type Oscillator Voltage Current max. cable max. cable rows intensity length 1.5 mm² length 2,5 mm² ENS 1200 1 48 VAC 1,35 A 60 m 100 m ENS 2400 1 48 VAC 2,60 A 31 m 51 m ENS 3600 1 48 VAC 3,85 A 21 m 35 m ENS 4800 1 48 VAC 5,00 A 16 m 27 m ENS 6000 1 48 VAC 6,46 A 13 m 21 m ENS 7200 1 48 VAC 7,81 A 10 m 17 m ENS 8400 1 48 VAC 9,06 A 9 m 15 m ENS 9600 1 48 VAC 10,31 A 8 m 13 m ENS 14 2 48 VAC 2x 7,81 A 10 m 17 m ENS 18 2 48 VAC 2x 10,0 A 8 m 13 m The two oscillator rows of ENS 14 and ENS 18 are fed via two separate leads, the current is therefore separated and therefore the maximum cable length is increased in the standard cross section. 35
ELECTROTECHNICAL INFORMATION ENS 1200-9600 4.5 Electrotechnical Information ENS 1200-9600 Internal Wiring Legend: V2-4 Varistor CH Relay board HR Auxiliary relay SV Solenoid valve FS1 Float switch for water supply FS2 Flow switch for low water level TP Thermostat FAN Fan NB1..n Ultrasonic nebulization module 36
ELECTROTECHNICAL INFORMATION ENS 14-18 4.6 Electrotechnical Information ENS 14-18 Internal Wiring Legend:: CH LWU SV FS1 FS2 TP NB1..n WS Relay board Varistor Solenoid valve Float switch for water supply Float switch for low water level Thermal protector Ultrasonic nebulization module Water sensor 37
ASSEMBLY, SET-UP AND LIMITS OF APPLICATION 5. Assembly and Set-up When planning and assembling the Ultrasonic humidifiers, care has to be taken to ensure that all materials, that get into contact with the demineralized water are resistant against demineralized water. For the most important materials, please refer to the following table. Materials for demineralized water Material Temperature max. Stainless steel (1.4571) >100 C PVC (Polyvinylchloride) 60 C PP (Polypropylene) >100 C PVDF (Polyvinylidenfluoride) >100 C PA (Polyamide) 60 C PSO (Polyethylene) 60 C Limits in Application: Water quality = < 5 µs/cm, up to 20 µs/cm for a short time Voltage control = 400 V + 10% or 230 V + 10% system Voltage humidifier = 48 V + 10% Water pressure = 0,5 bar to 6 bar in front of humidifier Water temperature = 8 C bis 40 C Air humidity = < 90% r.h. Air speed = min. 1,5 m/sec up to max. 3,0 m/sec When an extreme amount of dust particles is found in the air (e.g. silicone mill in printing houses), the air must be filtered, as dust deposits on the water would reduce the humidifier output. 38
ASSEMBLY ENS SERIES 5.1 Assembly ENS Series The humidifier can be installed in a compact air conditioning unit, a ventilation or aereation system or into an air duct. In any case, the unit should be installed such that it is easily accessible for reapir and service. A drain pan made from stainless steel (1.4571) has to be provided. The length of the pan should correspond to the humidifier path. (refer to 3.00). Installation Scheme Legend for Installation Scheme 1. Control box 2. to be provided by customer 3. Connection 3/4" male thread (gasket) provide passage pipe interruptor 4. Hand valve 5. Stainless steel pipe φ 6 mm (1.4571) 39
ASSEMBLY ENS SERIES 6. Ultrasonic humidification 7. Measuring electrode 8. 1 or 2 demineralizers or reversal osmosis incl. 1 demineralizer 9. Safety overflow 10. Water outlet 11. Provide drain 12. Stainless steel drain pan (1.4571) or PVC Please observe the following instructions upon assembly of the humidifier: a. Install humidifier in exactly horizontal position. b. The identification on the casing shows that direction of air flow must correspond to actual direction of air flow. c. Sufficient clearance to be provided above humidifier to enable removal of the mist collector for inspection purposes and cleaning of the water tanks. d. The ENS humidifier must only be attached at one side to ensure that temperature changes will not set the humidifier casing under mechanical stress. Attachment of the humidifier at both sides may cause damage to the humidifier! 40
ASSEMBLY ENS SERIES Water Supply Lines 1) Only use fully demineralized water <5µS/cm together with the humidifier. Install one check valve in each humidifier. Admission pressure 0.5 to 5 bar. 2) Perform connection between demineralization unit and the humidifier by means of a material that is resistant to fully demineralized water (e.g. PE or stainless steel (1.4571). 3) Swarf and dirt accumulation must not get into the water lines. Clean all lines before connecting them to the humidifier. Dependent on the safety risk, either use pressure tubing or stainless steel pipe to make the water lines. 4) Install the safety overflow. Under standard operating conditions, no water will flow out of the overflow pipe. Hydraulic Schematic Diagram 41
ASSEMBLY ENS SERIES Waterside connections at humidifiers type ENS. For position of the connections and other unit dimensions please refer to point 2.2. Water Supply Line Overflow 42
ASSEMBLY ENS SERIES Drain Connection to a drain pipe with solenoid valve is only required when due to special hygienic regulations the draining off of the water is necessary after a prolonged humidifier standstill. 43
PIPING EXAMPLE 3/4" 3/4" F00760-350 mm F00770-680 mm PVC hose 3/4" with fabric enforcement Pressed-in screw connection 3/4" 3/4" 3/4" Conductivity probe L80709 Union nut (provided by STULZ) (Measuring probe) 6/4 PE pipe < 9 bar M03777 Stainless steel pipe L11200 Deminera lizer 1 L80700 Demineralizer 2 T screw connection 6 for PE pipe M10421 T screw connection 6 for stainless steel pipe M11206 Union nut (prov. by Stulz) ENS humidifier for stainless steel pipe ENS Humidifier PE pipe Olive prov. by STULZ ENS humidifier for stainless steel pipe ENS Humidifier Quick coupling 6 incl. Teflon ring for PE pipe M10422 ENS Humidifier The pipe 6 outside /4 inside can deliver at 2 bar water admission pressure and 10 m length - 150 l/hour. This example shows which couplings and pipes/ hoses can be ordered from the STULZ stock. 44
INSTALLATION EXAMPLES ENS HUMIDIFIERS 45
ASSEMBLY ENS SERIES Installation into a Duct Legend 1. Duct piece of stainless steel 2. Water drain (provide syphon) 3. In case of non-laminar flow, install a perforated plate in direction of airflow in front of the humidifier Requirement: open cross section 60%. 4. Direct connection of safety overflow To obtain shortest possible humidifier paths it is very important to distribute the mist as evenly as possible across the total duct or unit cross section and to keep air speed within the range of 1.5 to 3 m/sec. In the following, some installations are shown, which are possible by means of buffle plates or perforated plates. 46
ASSEMBLY ENS SERIES Ultrasonic humidifiers of ENS series can be used for laminar flows at air speeds between 1.5 and 3 m/s. Should this air speed be exceeded, a perforated plate has to be installed in front of the air inlet of the humidifier (illustration no. 1). The perforated plates reduce the free cross section by more than 60% and therefore reduce the air speed through the humidifier in a very efficient way. For installation of the perforated plate, an angle section (illustration no. 2 and 3) is fastened to humidifier's assembly screw connection, where the perforated plate is then fixed to. 47
ASSEMBLY ENS SERIES Illustration no. 1 Perforated plate Ultrasonic ENS Article-no. Humidifier type A [mm] B [mm) M03191 ENS 1200 185 136 M03190 ENS 2400 185 255 M03189 ENS 3600 185 375 M10431 ENS 4800 185 495 M03188 ENS 6000 185 615 M03187 ENS 7200 185 735 M03186 ENS 8400 185 855 M03184 ENS 9600 185 975 M10432 ENS 14 165 705 M10433 ENS 18 165 870 Material: Aluminium perforated plate A FRE approx.. 38 % d hole 3.2 mm d= 1 mm 48
ASSEMBLY ENS SERIES Illustration no. 2 Angle section for buffle plate ENS Type A B C D E ENS 1200 220 120 50 60 25 ENS 2400 340 240 50 60 25 ENS 3600 460 360 50 60 25 ENS 4800 580 480 50 60 25 ENS 6000 700 600 50 60 25 ENS 7200 820 720 50 60 25 ENS 14 785 730 27.5 60 40 ENS 18 950 895 27.5 60 40 Material: CNS 1mm 49
ASSEMBLY ENS SERIES Illustration no. 3 Angle section for buffle plate ENS Type A B1 B2 C D E ENS 8400 940 480 360 50 60 25 ENS 9600 1060 480 480 50 60 25 Material: CNS 1mm 50
ASSEMBLY ENS SERIES Buffle plates (illustrations 4, 5 and 6) are used to reverse the air flow, entering the humidifier from above, to horizontal flow and to guide it through the humidifier. The buffle plates are fixed to an U-profile (illustration no. 7) which is mounted below the humidifier. 51
ASSEMBLY ENS SERIES Illustration no. 4 Buffle plate for ENS Type: ENS 1200-3600 Material: CNS 1mm 52
ASSEMBLY ENS SERIES Drawing no. 5 Buffle plate for ENS Type: ENS 4800-7200 Material: CNS 1mm 53
ASSEMBLY ENS SERIES Illustration no. 6 Buffle plate for ENS Type: ENS 8400 + 9600 Material: CNS 1mm 54
ASSEMBLY ENS SERIES Illustration no. 7 U- profile for buffle plate ENS Type A B C D ENS 1200-3600 40 550 165 10 ENS 4800-7200 40 890 165 10 ENS 8400 + 9600 40 1150 165 10 Material: CNS 1mm 55
ASSEMBLY ENS SERIES The installation of the humidifiers into a duct or air treatment unit may be performed by means of brackets, that are screwed to the side walls. A U-shaped bar, illustration no. 8A, is attached to these brackets, which has the relevant width of the duct or air treatment unit, respectively. A condensate pan having the approx. length of the humidifier path, has to be provided. 56
ASSEMBLY ENS SERIES Illustration no. 8: Assembly design ENS Brackets Article-No. Type A * B * * inside dim. M03180 ENS 1200-9600 173 25 M03183 ENS 14 +18 273 40 Material: V2A 1mm Illustration no. 8a: U-shaped bar Type A * B * C *Inside dim ENS 1200-9600 170 25 ENS 14 +18 270 40 Material: V2A 1mm 57
ASSEMBLY ENS SERIES Should only one humidifier ENS be installed in a duct or an air treatment unit, a simple bracket is sufficient (please refer to illustration). The bracket provides a distance between the humidifier and the pan of > 100 mm. This clearance is necessary for the generation of the carrier airflow for the mist. The same clearance should be provided above the humidifier. It is recommended to install and attach the bracket to the drain pan to be provided. *This dimension applies to ENS 1200-9600. The dimension for ENS 1/18 is 270. Stainless steel Thickness: 1mm 58
ASSEMBLY ENS SERIES If several huidifiers ENS are to be installed in a duct or an air treatment unit, they have to be distributed across the duct cross section, in order to achieve a constant distribution of humidity in the airflow. An appropriate stand to accomodate the humidifier in the air treatment unit is shown in the illustration. 59
INSTALLATION EXAMPLES FOR ENS HUMIDIFIERS 5.2 Installation Examples for ENS Humidifiers If several Ultrasonic humidifiers are to be installed in a duct, the humidifiers have to be distributed across the duct cross section in order to achieve a constant distribution of the humidity in the airflow. Please refer to the illustrations. 60
INSTALLATION EXAMPLES FOR ENS HUMIDIFIERS 1. 2. 3. 4. 5. 6. Install the humidifiers at the suction side. Use an air rectifier in the airflow in front of the humidifier; heat exchangers also fulfil the rectification function. During heating process, the air temperature at the humidifier casing must not exceed 40 C. The distance to the next object behind the humidifier in airflow direction should be larger than the humidifier path. Provide a stainless steel pan corresponding to the lengthof the humidifier path. The pan must be fitted with a drain, connected to a syphon. The height of the syphon is dependent on the differential pressure (environment/ suction side in the unit). To ensure that a sufficient carrier airflow is available for the aerosols that are getting out the humidifier, a distance of > 10 cm to the pan has to be provided for the lowest humidifier. The same is applicable on top of the humidifier and at the sides. 61
INSTALLATION EXAMPLES FOR ENS HUMIDIFIERS Complete Casing Assembly for 8 ENS 18 with Mist Collector and Revision Doo A mist collector is not necessarily required for the humidifier path of 1410 mm available. For special applications please refer to 3.04 "Dimensioning of Air Treatment Units for Humidifiers ENS". Air volume: Humidifier output: Pressure loss approx.: Mist collector Rectifier 43.900 132 320 m³/h kg/h Pa Ultrasonic units Supply water: 8 off completely demineralized 62
START-UP HUMIDIFIERS TYPE ENS 5.3 Start-up of Humidifiers Type ENS Preparation for initial operation a. Install the humidifier exactly in horizontal position and place humidifier in direction of airflow. b. Ensure that all line connections are made correctly, firmly and safe. c. Electric power supply is rated at 230/48 volt and is interlocked with the fan. d. Assemble and attach all other components in correct and safe manner. e. Make sure that the humidifier is supplied with electric current and fully demineralized water. f. To protect the water supply line against a too low pressure, a pressostatis interlocked with the humidifier. Precautions for a longer standstill 1) If the humidifier is not used for a longer period of time, the water must be drained off. 2) Close the water supply check valve. 3) Switch off the main switch at the control box. 63
START-UP OF ENS HUMIDIFIERS Before attempting to start the humidifier after a longer standstill, check the following points: a. Check whether the humidifier casing is in correct position and correctly installed, and whether humidifier is in good operating condition. b. Ensure that the mains and water supply to the humidifier has been connected. * Never switch in the main switch when the humidifier is still positioned on its side or stored topfirst. *Never operate the humidifier for a prolonged period of time without air supply. Humidifier operation 1) Open water valve. 2) Set the hygrostat, i.e. the humidity control, to the desired air humidity level. 3) If humidification is demanded and the air conditioning unit is already set to operation, water is automatically filled in up to the necessary level and atomization is started. 4) The mist then generated is blown into the ambient air via the airflow of the air conditioning unit and the room is humidified. 5) After that, the water level in the tank is kept to a constant level and air humidity is maintained at a preset level. 6) Should the water level in the tank fall belwo the safety level during operation, operation of the humidifier is stopped by means of the float switch. 64
PRECAUTIONS FOR OPERATION OF HUMIDIFIERS TYPE ENS 5.4 Precautions for Operation of Humidifiers Type ENS 1) Install the humidifier in horizontal position and ensure that the generated mist will be absorbed in an efficient manner by the airflow blown out by the fan of the air conditioning unit. Air speed should be 1.5 to 3.0 m/s. Carefully choose the location of the humidifier in those cases, where a special air conditioning unit is used, such as e.g. a compact air conditioning unit, that takes in the air through the humidifier. 2) Current supply should be dimensioned as to ensure that the humidifier will be supplied with power current only if the fan of the air conditioning unit is set to operation. 3) A hygrostat or humidity sensor should be activated if the air humidity falls below the setpoint. 4) Should more than one humidifier be controlled by one hygrostat only, multiplication should be provided by means of several relays. 5) The water used must be fully demineralized. Install a valve in the supply line for maintenance and control purposes. 6) If the humidifier is intended for installation in air ducts, the airflow rate should be between 1.5 and 3 m/s; additionally, a stainless steel drain pan (1.4571) has to be provided. 7) Should the air conditioned room be supplied at the same time with humidity during the cooling procedure, install the humidifier behind the cooling coil in order to prevent any loss in the humidifier output. 8) Should the humidifier be operated in an area where temperature may all below the freezing point (0 C), insulate and protect the water supply lines and the water tank against frost damage. 65
PRECAUTIONS FOR OPERATION OF HUMIDIFIERS TYPE ENS 9) Observe local requirements and regulations for water supply connection. 10) Provide sufficient clearance between the humidifier and the component parts, which are connected in series, as e.g. the fan, in order to ensure the dissolution of the aerosols and to avoid the generation of condensates. 11) It is recommended to use maximum sensors in the intke air for continuous and multistage control. 12) For ON/OFF control with one humidifier, a maximum hygrostat can also be installed in the intake air. 13) Take care to ensure that the water valve is kept open during the humidification process. 14) Should malfunctions occurr try to eliminate them with the help of the trouble shooting table. 66
DATA SHEET SAFETY TRANSFORMERS 6.1 Data sheet safety transformers 67
INFORMATION CONCERNING THE CONDUCTIMETER 6.2 Information concerning the Conductimeter The conductimeter measures and controls the conductivity of the demineralized water in µs/cm. When a measured value of 5 µs/cm is detected, the floating contact for the pre-alarm is activated. The contact is closed via terminals X1.9 and X1.10 and opened via terminals X1.9 and X1.8. When a measured value of 20µS/cm is detected, the floating contact for the alarm indication is activated. The contact is closed via terminals X1.6 and X1.7 and opened via contacts X1.6 and X1.7. Terminals X1.1 and 1.2 are provided for connection of an indicating instrument. Output voltage is rated at 0-1 volt, which corresponds to a measuring range of 0-50 µs/cm. The conductivity cannot be measured by means of a multimeter. A potentiometer is provided for final adjustment 0-1 volt. When the printed board is tested, an adjustment can be made with the connection of resistors. The individual resistances mentioned in the following and connected instead of the electrode, are intended to simulate : 500 kohm = 1 µs/cm 100 kohm = 5 µs/cm 50 kohm = 10 µs/cm 25 kohm = 20 µs/cm 10 kohm = 50 µs/cm The electrode itself can only be checked by comparison measurement. 68
INFORMATION CONCERNING THE CONDUCTIMETER Conductimeter Terminal connections: X1.1 0-1 V Iactual value output (0-50 µs/cm) X1.8 K1 break contact (5 µs/cm) X1.2 Mass X1.9 K1 Bockpol X1.3 Electrode X1.10 K1 make contact X1.4 Electrode X1.11 supply 0 V (N) X1.5 K2 make contact (20 µs/cm) X1.12 supply 24 V 50/60 Hz X1.6 K2 Bockpol X1.13 supply 220 V 50/60 Hz (L) X1.7 K2 break contact Measuring probe 69
CE - EMC law 7.1 Information about the EMC law according to CE-guidelines On 1st January 1996 the EMC law (Electromagnetic Consistency) came into force for the European Community. The EMC law has special requirements regarding radiation noise, conducted noise, surge immunity and harmonic oscillations. To keep to the regulations in the industrial area (class A) concerning ultrasonic humidifiers, a power supply filter and/or a condenser - depending on the type of humidifier - has to be connected to the primary of the transformer. (From now on the relevant parts will be supplied loose with the delivery. This applies for deliveries within the European Community.). This simple modification is only necessary for new installations. A retrofit of existing installations is not necessary. CE - Declaration of Conformity When the following interference suppressing methods are carried out, all STULZ Ultrasonic humidifiers essentially meet the EC-guideline 89/336/EEC, as well as the regulations of the harmonized norms EN 55011, EN 60555 and EN 50082-2. If the units are used wrongly and/or the technical manual and the measures which are described here are not followed, this declaration becomes invalid. Interference Suppressing Method ENS 1200 to ENS 9600: To fulfil the EMC requirements, two condensers (class Y) 0,22 µf (part no.: M25114) have to be connected on the primary of the transformer (see diagram below). ENS 1200-48 V ENS 9600 0,22µF 230 V Power Supply ULTRASONIC Transformer or MUS/SUS 0,22µF 70
Interference Suppressing Method ENS 14 and ENS 18: To fulfil the EMC requirements, a filter type ZAC 2210-00U (part no.: M25121) or equivalent has to be connected on the primary of the transformer. In addition a condenser 0,22 µf (part no.: M25114) has to be connected parallel to the filter induct (see diagram). 4 1 ENS 14 - ENS 18 48 V ZAC 2210-00U 0,22µF 230 V Power Supply 3 2 ULTRASONIC Transformer or MUS/SUS Filter It is also necessary to install a shielded cable between the ENS 14/18 and the MUS/SUS or transformer. The following applies for all Ultrasonic types: WARNING The Ultrasonic humidifier is an installation class A. This installation can cause radio interferences in residential areas; in this case the user can be asked to take appropriate measures on his own account. Hamburg, 16.04.1996 71