VAV controller In explosion-proof version RVP-R- SMAY LLC / 29 Ciep³ownicza St. / 31-587 Cracow / Poland tel. +48 12 378 18 00 / fax. +48 12 378 18 88 / e-mail: info@smay.eu
Intended use VAV control units are intended for supply and extract air systems, for automatic adjustment of the volume flow rate in the ventilation ductwork. By varying the air flow rate, the units allow to create individual climatic conditions for every space in the building, considering the occurrence of uneven loads in these areas, depending on the number of people in the space and variable external factors such as: heat gains as a result of exposure to sun of transparent and non-transparent barriers in the space. The devices RVP-R-Ex type provide high safety level and are intended to use in the places, in which there is possibility of explosive atmosphere occurrence, caused by gases, vapors, mists and air-dust mixtures. The devices RVP-R-Ex type are designed according to the directive ATEX 94/9/WE as the devices of group II category 2 intended to use in the explosion-hazard zones 1,2,21 and 22. The manufacturer's ATEX certificate is available for electrical components. Material and finish The casing and the control damper blade are made of galvanized steel sheet or, on special request, stainless steel 1.4301. The damper blade is equipped with rubber sealing, which provides the air tightness while complete closing of the damper. The damper blade axis is placed in the bearing made of the anti-static plastic or brass. The measuring blade is a measuring element. The blade is made of aluminum section with the impulse holes accordingly arranged within its precincts. The control-drive system of the VAV controller consists of the static differential pressure sensor, the actuator and the controller (the controller is placed beyond the explosion-hazard zone in accordance with the diagram 5) Principles of operation The principle of operation is based on the measurement of the volumetric air flow through the controller. In the controllers where measurement blade is used, the measurement is conducted with use of impulse holes. During the air flow through the measuring element, the pressure difference, dependent on the flow rate is created on both its sides. The signal from the orifices is transmitted to the pressure sensor with flexible impulse tubes. The pressure value on the orifice, shall be transmitted to the controller, where it is converted into a flow rate value and compared with the preset value. If the measured value is different from the preset value, the control blade actuator adjusts the blade into such position, that there would be no difference between the measured value and the preset value. Fig. 1. Static-pressure tubes damper differential pressure transducer Preset value regulator damper actuator Measured value Note: the preset parameters of the air flow are set by the manufacturer and must not be modified by unauthorized personnel 246
RVP-R-Ex Fig. 2. VAV controller type: RVP-R-Ex Dimensions damper blade Casing Orifice plate Typical dimensions and the field of application Table 1. Dn [mm] L [mm] Lc [mm] Volumetric airflow [m 3 /h] 125 265 365 90-445 160 280 380 145-725 200 300 400 225-1130 250 350 450 350-1770 315 415 515 560-2800 400 500 600 900-4540 500 600 700 1400-7100 Installation guidelines To ensure the proper operation of the device, it is recommended to respect the following rules: - Length of the straight segment in front of the controller 2D - Length of the straight segment behind the controller 1D The electric connection of the measure-control-executing unit should be carried out by properly qualified person, in accordance to the diagram given in the documentation enclosed to the device. Pressure drop in the controller RVP-R-Ex (full opening of the damper) Diagram 1. RVP-R controllers were the subject of the analytical tests for arrangement of the measuring elements, aimed at reducing the threshold of controlled air flow calibration error, which was presented in master's dissertation, defended at AGH University of Science and Technology in Krakow in 2005. Pressure drop [Pa] 3 Volume flow rate [m /h] 247
Technical specification Table 2. Sound power level at the outlet of the controller RVP-R-Ex L WA [db (A) ] 3 6 9 12 3 6 9 12 3 6 9 12 m/s m/s m/s m/s m/s m/s m/s m/s m/s m/s m/s m/s 42 49 58 63 55 63 65 69 60 66 70 71 43 53 60 65 54 64 67 72 62 66 71 72 42 52 59 63 55 60 65 71 62 65 70 73 44 55 61 66 55 62 66 72 62 62 70 74 41 56 62 71 57 62 67 75 61 61 73 78 45 54 60 70 58 64 69 75 64 64 75 79 44 56 61 72 58 63 68 73 63 63 74 78 Table 3. Sound power level emitted to the surroundings of the regulator RVP-R-Ex L WA [db (A) ] to the environment Control and drive system 3 6 9 12 3 6 9 12 3 6 9 12 m/s m/s m/s m/s m/s m/s m/s m/s m/s m/s m/s m/s 24 29 36 43 32 38 43 51 33 39 47 53 24 32 38 45 33 40 44 53 41 44 48 55 25 31 42 48 36 44 47 52 42 46 52 54 30 41 44 49 39 46 47 55 48 51 54 59 33 46 47 53 45 51 53 55 49 56 57 59 36 49 50 53 48 55 56 58 54 56 61 64 35 50 51 53 47 55 57 59 53 55 61 63 The unit has the following control possibilities: - control - constant setting: 2...10, 0...10 [V] the controller controls the air flow in the duct between the preset settings Vmin, Vmax, depending on the continuous leading signal, within the range of programmed control voltage (0...10, 2...10 [V]); - control -forced setting: Close the damper blade is in complete closed position the damper closing at the air supply or the air exhaust to the unused spaces, enables to save the energy. Open the damper blade is in complete open position it is used for supporting the smoke-removal from spaces(intensive pressurization) or most frequently as the safe position, Vmin minimum volumetric flow depending on the needs or if there are no people in the space, the particular zones are shifted into standby- this provides only minimum ventilation of the spaces therefore the significant reduction of energy consumption is possible, Vmid mid position possible position for operation at the calculated air demand in the space, Vmax maximum volumetric flow single space or group of spaces must be supplied with maximum air flow for short time it enables ventilation of a space, cooling it in the evening or warming it quickly in the morning; control with use of LonWorks system. 248
RVP-R-Ex Control and drive system to the actuator!placed beyond explosion hazard zone! Diagram 2. Diagram of the operating mode change of the VAV-Ex controller with LonWorks communication with use of the rotary switch from the controller: from the regulator: a - close, b - open, c - V, d - V, e - V, f - no forcing min mid max Actuator Closed controller Minimum value Nominal value Maximum value Open controller Controller 0/2 10 V Diagram 3. Diagram of the operating mode change of the controller. Forced control in case of 0/2 10V communication Technical data for the actuator ExMax-5.10-Y (ExMax-5.10-CY): ExMax-5.10-Y intended for LonWorks communication ExMax-5.10-CY intended for 0/2 10V communication Supply voltage: 24[V] AC/DC Torque: 5Nm / 10Nm Working direction: selectable by the switch Angle of rotation: 0...95 Protection class: I (grounded) Motor running times: 7,5/15/30/60/120 [s] (from 0 to 90º) IP protection: IP66 Ambient temperature range: -40...+40 [ C] Storage temperature range: -40...+70 [ C] Humidity: in accordance with EN 60335-1 Maintenance: maintenance-free Dimensions: 210x95x80 mm Weight: 3,5 [kg] Approbations: PTB tested: PTB 04 ATEX 1028X In accordance with ATEX: 94/9/EC (ATEX) Approval for gases: II2G EEx d [ia] IIC T6/T5 zone 1, 2 Approval for dust: II2D IP66 T80 C zone 21, 22 Identification: CE Nr 0158 EMC: 89/336/EC directive EMC Low voltage: 72/23/EC low-voltage directive IP-Protection: IP 66 in compliance with EN 60529 Potential compensation: External terminal PA, 4 mm 249
Control and drive system The parameter selection for the power supply sources in the facility depends on the selected time of rotation and the supply voltage rate. The attached current rates are the approximate values, because due to the unit construction, the power dissipation within the electronics may occur. The power input in the lockout position, regardless of the time, amounts max. 20W. The power consumption, because of the heater, fluctuates within the range from 5 to 12W. The heater is switched on when the engine does not work. At the time of starting up, the current value taken by the actuator amounts ca. 4,5A for 1sec (please take it into account while choosing the cables and power supply). Table 4. Power consumption depending on set time of actuator rotation 7,5s 15s 24 V 4,7 A 1,45 A 30s 60s 120s 0,52 A 0,4 A 0,4 A Technical data for the actuator ExCos-P: Power supply: 24 VAC/DC ± 20% (19,2...28,8 VAC/DC) 50... 60 Hz Current, power consumption: 150 ma, - 4 W, internal fuse 500 ma, without bracket, not removable Galvanic isolation: Power supply - analogue output 1,5 kv (Ex 60 V) Electric connection: Protection class: Display: Terminals 0,14... 2,5 mm2 in the integrated Ex junction box Class I (grounded) 2 x 16 digits, dot-matrix with highlighting IP protection: IP66 in accordance with IEC 60529 Casing material: Sensor: Sensor response time: Sensor accuracy: Non-linearity and hysteresis: Output: Voltage U at output: Aluminum casting, coated Piezo pressure transmitter T90 / 5 sec. ± 2% value +/- 1 Pa Usually ± 0,05 %, max. 0,25% value Voltage U(V) or current I (ma) to be selected in menu on site From 0...10 V DC adjustable, reversible, burden <1kO, influence <0,05 % /100 O Current I at output: From 0...20 ma adjustable, reversible, burden <500 O, influence <0,1 % /100 O, open circuit < 24V Approbations: PTB tested: In accordance with ATEX: PTB 04 ATEX 1028X 94/9/EC (ATEX) Approval for gases: II2(1)G Ex e ma [ia] IIC T6 zone 1, 2 Approval for dust: II2(1)D Ex td A21 [iad] IP66 T80 C zone 21,22 Identification: CE No. 0158 EMC: Low voltage: 89/336/EC 72/23/EC low-voltage directive Casing protection: IP 66 in accordance with EN 60529 Potential compensation: External terminal PA, 4 mm2 250
RVP-R-Ex Technical data for the actuator ExReg-V300-A: Control and drive system Power supply: 24 VAC/DC ± 20% (19,2...28,8 VAC/DC) 50... 60 Hz Current, power consumption: 150 ma, - 4 W, internal fuse 500 ma, without bracket, not removable Galvanic isolation: Power supply - analogue output 1,5 kv (Ex 60 V) Electric connection: Terminals 0,14... 2,5 mm2 in the integrated Ex junction box Protection class: Class I (grounded) Display: 2 x 16 digits, dot-matrix with highlighting IP protection: IP66 in accordance with IEC 60529 Casing material: Aluminum casting, coated Sensor: Piezo pressure transmitter Sensor response time: T90 / 5 sec. Sensor accuracy: ± 2% value +/- 1 Pa Non-linearity and hysteresis: Usually ± 0,05 %, max. 0,25% value Output: Voltage U(V) or current I (ma) to be selected in menu on site Voltage U at output: From 0...10 V DC adjustable, reversible, burden <1kO, influence <0,05 % /100 O Current I at output: From 0...20 ma adjustable, reversible, burden <500 O, influence <0,1 % /100 O, open circuit < 24V Approbations: In accordance with ATEX: EPS 11 atex 1 380 94/9/EG Approval for gases: II2G Ex e mb ib[ia] IIC T6 zone 1, 2 Approval for dust: II2D Ex tb [iad] IIIC T80 C zone 21,22 In accordance with IECEx: IECEx EPS 12.0028 Approval for gases: II2G Ex e mb ib[ia] IIC T6 zone 1, 2 Approval for dust: II2D Ex td [iad] IIIC T80 C zone 21,22 Identification: CE No. 0158 EMC: 89/336/EC Low voltage: 72/23/EC low-voltage directive Casing protection: IP 66 in accordance with EN 60529 Potential compensation: External terminal PA, 4 mm2 Sensor Power supply Range Min range Max pressure Output ExCos-P250 intended for LonWorks communication Pressure/differential pressure 24VAC/DC +/- 250 Pa 50 Pa 25000 Pa (0) 4 20 m/0..10v ExReg-V300-A intended for 0/2... 10 V communication controller 24VAC/DC +/- 300 Pa 60 Pa 25000 Pa (0) 4 20 m/0..10v Table 5. Technical data of the pressure transducer and controller 251
Control and drive system Diagram 4. General diagram of the connection of the pressure transducer ExCos-P Diagram 5. General diagram of the connection of the ExMax actuator 252
RVP-R-Ex Control and drive system General diagram of the connection of the VAV Ex Explosion hazard zone Placed beyond explosion hazard zone! Diagram 6. General diagram of the connection of the VAV Ex automation with LonWorks communication Diagram 7. General diagram of the connection of the VAV Ex automation with LonWorks communication Note: the control-drive system is connected with wires by the manufacturer, however the buyer is obliged to lead the power supply to the controller and driver and the control signals to the controller. Electrical connections should be made in accordance to the automation diagram, attached to the documentation of designed system, by suitably qualified personnel. 253
Order code RVP-R-Ex-315-1300/1100/700 RVP-R-Ex - D - max / min - K - P diameter [mm] maximum volumetric airflow [m3/h] minimum volumetric airflow [m3/h] 1 Lon - communication* 2...10 [V] 0...10 [V] LonWorks (SmayLab) Material* Galvanized steel Stainless steel * optional values - default values will be used if optional values are not specified 254