ROOM CONTROL EQUIPMENT Electronic control of cooling and heating. ROOM CONTROL EQUIPMENT RWBa For sequential control of heating and cooling, or cooling/ heating only. Electromechanical actuators provide assured operations. Connection card and prefabricated cables with quick connectors facilitate installation and give immense flexibility. Regular conditioning of valves ensure operation. FUNCTIONS - Control cooling and heating in sequence. - Adapted for room control no unnecessary functions low costs. - Individual temperature control high comfort. - Universal actuator compatible with most types of actuator, with or without adapters. AREAS OF APPLICATION For waterborne climate systems in connection with new installations, expansion and renovation. RWBa has been developed for Stifab Farex water based climate systems. RWBa consists of: Regulator with integrated temperature sensor, electromechanical actuator, valve housing, prefabricated cables with quick connectors and connection card. Regulation function: PI or P (resettable). Supply voltage: 24 V AC. RWBa We reserve the right to change the technical specification. 169
STIFAB FAREX ROOM REGULATOR EQUIPMENT ADVANTAGES OF RWBa Sequential control of heating and cooling. The regulator has adjustable regulation function, P or PI. Basic circuit diagram The connection card and prefabricated cables are used with series installation. This facilitates installation and gives a flexible solution. With modified room division only the electrical cables need to be re-routed. Up to 10 actuator pairs (10+10) per regulator. Reliable and energy saving three position electromechanical actuator. The actuator only consumes current during the period it is working (opens or closes). The actuator is not fed with current in both the open and closed positions. The equipment requires no trimming, the operating parameters are pre-programmed for comfort control. The system has clear operating display. The actual operating mode is shown on the regulator and the valve s position is shown on the actuator via the position indicator. Test/Start up function that allows function checks during commissioning. This function also makes it possible to open all valves centrally, which makes venting the system easier. The valves are conditioned regularly to prevent jamming. The sensors for the changeover function can be connected to the regulator, external temperature sensor and currentless, normally closed contacts, for example, a window contact. FUNCTION Sequential control of heating and cooling. With higher temperatures than the set point value the cooling actuator opens the cooling valve and when the temperature drops below the set desired value by 2K the heating valve opens. The control functions are set for PI control. The I section detects the size as well as the duration of the control deviations so that remaining deviations are eliminated. The control parameters are set for comfort control, which means that the temperature can be set within the range 18 C to 26 C with cooling and 16 C and 24 C with heating. The neutral zone between cooling mode and heating mode is 2K. The regulator conditions the valves if they have not moved for eighteen hours. The regulator s pre-programmed Test/Start up function permits control of regulator and actuator functionality. The regulator opens and closes in fixed steps. This also permits all valves on the loop to be opened centrally, for example, when venting the system. Currentless normally open contacts, e.g. the window contact, can be connected to the regulator s screw terminal to set the operating parameters to economy mode or frost protection mode. RWBa, with prefabricated cables and connection card Function Heating requirement Heating valve Output signal/valve mode (% open) 100% 80% 50% Cooling valve 2K Neutral zone Cooling requirement Example: Room temperature = 24 C Valve opens 50% and the regulator starts to acts to Set desired value - 22 Copen or close valves depending on the cooling requirement. Installation RWBa, connection to perimeter unit Farline using factory fitted actuators and connection cards. INSTALLATION Installation is easy to carry out using prefabricated cables and connection cards with quick connectors. See the figure to the right. RWBa, connected to a chilled beam and radiator 170
TECHNICAL DATA REGULATOR RWBa RE The regulator consists of a circuit unit, sensor, LEDs and set point potentiometer fitted in a plastic enclosure. Designation: RWBa RE. Temperature: Ambient temperature with storage 25 to +65 C. In operation 0 to +50 C. Labelling: Stifab Farex logo on the cover. Enclosure: ABS - white plastic. Protection class: IP 30. Supply voltage: 24 V AC + 20%, 50-60 Hz. Terminal block: There are quick connectorsor voltage supply and motor outputs. Other outputs are connected on screws terminals for 0.5 mm 2 cables. Control outputs: 24 V AC, 0.5 A, 1 for heating, 1 for cooling. Other outputs: Normally open contact for the window contact and normally open condensation sensor. Changeover sensor External temperature sensor Power consumption: Regulation function: Neutral zone: Temperature sensor: Setting range: Operating mode: Operating control: Installation: Lead throughs: Delivery setting: 0,5 VA (only the regulator), 15 VA (including 10 actuator pairs). P or PI (resettable), p-band can be set to 2K or 4K. 2k or 4k (resettable) Thermistor. 16 26 C. Knob setting in centre position 22 C (comfort mode). Comfort mode, economy mode and frost protection mode. LEDs. Cooling operation - blue LED. Neutral - LEDs off. Heating operation - red LED. On the wall or 70 mm standard connection box. Not exposed to direct sunlight. Lead throughs must have a minimum diameter of 12 mm to permit routing of the connectioncable to the regulator. See description under the CONNEC- TION INSTRUCTIONS. The product is Ce marked and complies with EU s demands regarding EMC. Regulator RWBa RE Operating mode Operating mode Comfort mode: Neutral zone = 2K 100 Activated by DIL-switches. Economy mode: Neutral zone = 2K Activated by DIL switches and open contact (window contact or the like). Frost protection mode: Neutral zone = 2K Activated by DIL switches and/or open contact (window contact or the like). 90 32 21 Operating parameters 20 C 22 C 16 C 24 C Heating 18 C 14 C 22 C Heating 12 C 12 C 12 C Heating 18 C 26 C Cooling 25 C 21 C 29 C Cooling Cooling With connection of the normally open contact (window contact or the like) to the regulator s output D1 the regulator switches between a primary (normally closed contact) and a secondary (normally open contact) depending on the status of the contact. Possible operating modes are: Operating mode 1: from comfort mode to frost protection mode Operating mode 2: from comfort mode to economy mode Operating mode 3: from economy mode to frost protection mode The delivery setting is made with DIL switches according to the description given under CONNECTION INSTRUCTIONS. RWBa 171
VALVE ACTUATOR RWBa ST Designation: RWBa ST Labelling: Stifab Farex logo on the cover. Enclosure: ABS - white plastic. Supply voltage: 24 V AC + 20%, 50-60 Hz. Function: 3 modes, increase/decrease, electromechanical. Connection cable: Supplied with 1.0 m 3 core cable. Power consumption: 0.8 VA Protection class: IP 40. Operating control: 1 = closed valve 0 = open valve Actuator force: 100 N Stroke length: 0-2.5 mm Weight: 300 g Connection: Threaded M30 x 1.5 Installation: The valve s actuator connection must not be fitted under the horizontal line. The product is ce marked and complies with EU s demands regarding EMC. VALVE RWBA VD / VE Valves RWBa VD (straight valve) and RWBa VE (angled valve) fit on the system s RWBa ST, which is fitted directly to the valve. Dimensions: see the table to the right. kv - value: see the table to the right. Max working pressure: 1000 kpa Max pressure drop across an open valve: 20 kpa Max pressure drop across a closed valve: 150 kpa Max. supply pipe temperature: 110 C Max concentration of glycol in the water: 40% Presetting the k v -value Setting is done according to the table to the right, see illustration below. Valve actuator RWBa ST Ventil Dim. table DN (inch) 81,4 VD Table k v -value RWBa VD / VE Type Straight 2-way valves VD) M30 x 1.5 3/8 VD110 1,10 0.25..1.10 1/2 VD115 1,90 0.28..1.90 83 VE DN A B C D E V D110 3/8" 55. 5 29. 5 46. 5 24. 5 35 V D115 1/2" 61 33 46. 5 24. 5 35 V D120 3/4" 65 40 46. 5 24. 5 35 V E110 3/8" 51. 5 22 40 18 35 V E115 1/2" 55. 5 26 40 18 35 V E120 3/4" 65 29 40 18 35 k v -value delivery setting k v -value limit settable (m 3 /h) 3/4 VD120 2,60 0.25..2.60 Angled valves (VE) 3/8 VE110 2,20 0.25..2.20 1/2 VE115 2,60 0.28..2.60 3/4 VE120 3,40 0.25..3.40 1. Screw in the insert clockwise until it bottoms. 2. Turn the insert anti-clockwise to 0 3. Turn the insert clockwise to the required preset number. Table presetting the k v -value RWBa VD / VE Preset figures 1 2 3 4 5 6 7 0 VD110 0.25 0.60 0.80 0.94 1.02 1.06 1.09 1.10 VD115 0.28 0.65 0.88 1.12 1.30 1.46 1.57 1.90 VD120 0.25 0.60 0.91 1.18 1.43 1.64 1.85 2.60 VE110 0.25 0.60 0.85 1.07 1.27 1.44 1.62 2.20 VE115 0.28 0.60 0.87 1.10 1.32 1.50 1.72 2.60 VE120 0.25 0.64 0.92 1.23 1.50 1.72 1.93 3.40 172
CONNECTION CARD RWBa KK Connection card for connecting actuators, transformers and slave units to the regulator. All connections are made using quick connectors and prefabricated cables. Designation: RWBa KK Enclosure: ABS, grey plastic Protection class: IP 20. Labelling: On the enclosure showing the connection and orientation of slave and operating voltage cables. The connection card has a self-adhesive film on the back that makes it easy to install where required. Each connection card has two actuator outputs, one for heating and one for cooling, two slave outputs(signal and power supply) and a regulator input. All connectors on the card are female connectors. See the figure under CONNEC- TION INSTRUCTIONS. TRANSFORMER RWBA TS Double insulated protection transformer. Designation: RWBa TS Enclosure: Fully enclosed Plastic cover Protection class: IP 54. Primary side: 230V AC, 50-60 Hz. Connection with plug SE Secondary side: 24 V AC, 2.5 A, secondary fuse. Connection cable, length = 1 m, with 2 branches, quick connector 2L (male) for connection to the connection card. The branches are marked with blue and red tape for orientation to the colour codes on the connection card. Installation: Securing holes on the outside of the enclosure or using a bracket against the wall (perimeter wall system). The product is ce Ce marked and complies with EU s demands regarding EMC and LVD. CABLES RWBa KL Cable, operating voltage: RWBa KL - A Prefabricated 2 wire cable 0.5 mm 2 with quick connector (male) for connection of the operating voltage between the connection cards. The cable is available in three standard lengths, 1900, 3200 and 4200 mm. The cable can be joined using a terminal block, see under accessories. Cable, slave control RWBa KL - B Prefabricated 6 wire cable 0.5 mm 2 with quick connector (male) for slave control. The cable forwards the control signal and operating voltage between cards. The cable is available in three standard lengths, 1900, 3200 and 4200 mm. The cable can be joined using a terminal block, see under accessories. 52 Connection card, transformer RWBa KK Cables 52 30 RWBa TS-1 RWBa KL - A RWBa KL - B RWBa KL - C Selection - maximum cable length The maximum cable length from the transformer connection point to the farthest actuator and maximum cable length from the regulator to the farthest actuator see the formula below. Maximum cable length ( 0.5 mm 2 ) = 672 / (2 ΣP (VA) ) P regulator = 0.5 VA P actuator = 0.8 VA Example 1. 1 regulator and 8 actuators cooling and 8 actuators heating. Maximum cable length = 672 / (2 (0.5 + 8 0.8)) = 48.5 m. Exempel 2. 24 rooms with 1 perimeter unit per room, c-c between regulators is 6 m. Tests using two transformers give the overall cable length per transformer: 24 6 / 4 = 36 m (see illustration below). Check with the formula gives: Maximum cable length = 672 / (2 6( 0.5 + 0.8)) = 43 m. As cooling and heating actuators have separate cables the maximum cable length will be equal when you have both cooling and heating actuators and when you only have cooling or heating actuators. 36 m 36 m 36 m 36 m Transformer L (end to end) Transformer Cable lengths to perimeter system FARLINE Calculate the requisite cable length between devices by taking the measurement L (end to end as illustrated below) and add 600 mm. Select the closest, longer standard length. Regulator cable RWBa KL - C Prefabricated 6 wire cable 0.5 mm 2 with quick connector (male) for connection of the regulator to the connection card. The cable is available in standard lengths of 1500 and 3000 mm Cable selection and calculation of cable lengths for the perimeter system FARLINE see the description to the right. RWBa 173
ACCESSORIES Terminal block for operating voltage cable: RWBT SK - 2L Terminal block with two pins for interconnecting the cable for the operating voltage. Terminal block for the slave control cable: RWBT SK - 4L Terminal block with four pins for interconnecting the cable for the slave signal. One terminal block 2L and one terminal block 4L are required to interconnect cable RWBa KL - B Cable connector: RWBT KT Removable cable connector with male housing, for connection to connection card RWBa KK. Cable connector 2 pin, operating voltage: RWBT KT - 2L Cable connector 3 pin, actuator: RWBT KT - 3L Cable connector 4 pin, control signal: RWBT KT - 4L Cable connector 6 pin, regulator signal: RWBT KT - 6L Quick connector in the regulator (3 x 2 pins) not removable. Accessories Terminal block RWBT SK - 4L and SK - 2L Cable connectors RWBT KT - 2L, 3L, 4L and 6L Screw terminal for actuator RWBT SP Screw terminal for actuator RWBT SP Screw terminal with quick connection to actuator RWBa ST. The screw terminal is connected once the supplied cable has been disconnected (quick connection). External temperature sesnor RWBT TG External temperature sensor, length 2500 mm. Assembly set RWBT CS, clips for changeover sensor External temperature sensor RWBT TG can be used as a changeover sensor by using assembly set RWBT CS. The sensor can be fitted to 12-16 mm pipes by using the assembly set. The changeover sensor, which is connected to the regulator s screw terminal, is adapted for a 2-pipe system and can work with both cooling and heating with only one valve connected. The temperature that the sensor detects on the supply pipe determines the operating mode the regulator shall work under. External temperature sensor RWBT TG Assembly set for changeover sensor RWBT CS Adapter for motor to work with other makes of valve RWBT AV The adapter makes up the connection between the valve and the actuator. Fits dim. 10, 15 and 20 mm. Actuator RWBa ST with adapter is compatible with the following makes and types of valve: Danfoss RAV, RAV-L, RA 2000 Heimeier Oventrop Markaryd Material: White plastic. The actuator fits directly (without adapter) to all valves with threaded fitting M30 x 1.5 and stroke length <2,5 mm. 174
CONNECTION INSTRUCTIONS Black Blue Black Blue Orange Violet Orange Violet Prefabricated cables are marked with colour codes and numbers or colours and white markings. Black Black Blue Orange Violet Connection to connection card RWBa KK Connection to another terminal block Inputs/outputs G: System potential G0: System zero Y1: Actuator heating - open Y2: Actuator heating - closed Y10: Actuator cooling - open Y20: Actuator cooling - closed Outputs with screw terminals on the regulator (even the Delivery settings on the DIL switches must be checked for these). B2 to M: Changeover sensor BI to M: External temperature sensor D1 to M: Normally closed contact, for example, window contact. Strapped on delivery. D2 to M: Normally closed contact, for example, normally closed condensation guard. Strapped on delivery. The outputs D1 and D2 work without current, voltages above 24 V AC can destroy the regulator. Maximum cable length is 100 m. Test/Start up function Activity Signal 1. Heating valve opens 60 s light 2. Cooling valve opens 60 s pulse and blue light 3. Both valves remain open for 60 s and blue pulse 4. Heating valve closes light and blue pulse 5. Cooling valve closes Blue light The delivery settings are activated after the regulator is first switched off and then restarted. Delivery settings of the DIL switches in the regulator Op. Mode 1 Op. Mode 2 Op. Mode 3 Switch: Mode: 1 Op mode select ON ON OFF ON / OFF 2 Op. mode select ON OFF OFF ON / OFF 3 P-band heating: ON = 2K / OFF = 4K ON / OFF 4 P-band cooling: ON = 2K / OFF = 4K ON / OFF 5 Reg. function: ON = PI / OFF = P ON / OFF 6 Neutral zone: ON = 2K / OFF = 4K ON / OFF 7 External temp. sensor (also see terminal8!) ON / OFF 8 Internal temp. sensor (also see terminal7!) ON / OFF 9 Run-time actuator: ON = 150 s / OFF = 45 s ON / OFF 10 Test-/start up function ON / OFF Delivery settings are marked in bold. Operating mode Primary mode Secondary mode Operating mode 1: from comfort mode to frost protection mode Operating mode 2: from comfort mode to economy mode Operating mode 3: from economy mode to frost protection mode Transition from primary mode to secondary mode takes place when the currentless contact between D1 and M breaks. Changes to the delivery settings are activated after the regulator is first switched off and then restarted. RWBa 175
SPECIFICATION Room control equipment type RWBa with electromechanical actuator for sequential control of heating and cooling. Specification Product Regulator Valve actuator RWBa RE RWBa ST Valve RWBa aa - bb Design: Straight = VD Angled = VE Size: 15, 20, 25 Accessories Terminal block cables Two pin= 2L Four pin= 4L Cable connector (male) Two pin = 2L Three pin = 3L Four pin = 4L Six pin= 6L Screw terminal Assembly set External temperature sensor RWBT SK - a RWBT KT - a RWBT SP RWBT CS RWBT TG Connection card RWBa KK Transformer RWBa TS - a Type: Without bracket = 1 Withbracket = 2 (perimeter system) Cable RWBa KL - a - bbbb Type: Operating voltage (2-wire) = A Slave cable (6 way) = B Length: 1900, 3200 and 4200 mm. Adapter, actuator/valve To valve type: Danfoss RAV Danfoss RAV-L Danfoss RA 2000 Heimeier Markaryd MNG Oventrop RWBT AV- aaaaaaaaa Regulator cable (6-way) Length: 1500 and 3000 mm. RWBa KL - C -aaaa Ordering example: Room control equipment for series connection of 7 FARLINE perimeter units c/c 2400 mm: 1 x regulator RWBa RE, 1 regulator cable RWBa KL-C-1500, 1 x transformer RWBa TS-2 and 6 slave cables RWBa KL - B - -3200. Room control equipment for series connection of 6 beams (c-c 3600 mm) for cooling and heating: 1 regulator RWBa RE, 1 regulator cable RWBa KL-C-1500, 12 valve actuators RWBa ST, 12 valves RWBa VD-15, 6 connection cards RWBa KK, 5 slave cables RWBT KL - B and 1 transformer RWBa TS-1. 1 terminal block for the operating voltage cable RWBT SK - 2L is also required if the transformer is to be connected between the connection card and slave control cable. Alternatively with connection to a junction box with screw terminals: 1regulator RWBa RE, 1 regulator cable RWBa KL-C-3000, 12 valve actuators RWBa ST, 12 valves RWBa VD-15 and 1 transformer RWBa TS-1. Note that junction boxes and cables are not supplied. 176