7 871 ISO 9001 Electronic Air / Fuel Ratio Control System RVW20... Electronic control unit - for use with modulating single- and dual-fuel burners - with extended functionality for mechanical air / fuel ratio control The RVW20... and this Data Sheet are intended for use by OEs which integrate the control system in their products! Use -dependent control of the burner s air damper the fuel valves an additional actuator Suited for use in connection with O2 trim control RPO25... Optimum and efficient burner operation 24.10.2001 HVAC Products
Warning notes To avoid injury to persons, damage to property or the environment, the following warning notes should be observed! Do not open, interfere with or modify the unit! Before performing any wiring changes in the connection area of the RVW20, completely isolate the unit from the mains supply (all-polar disconnection) Ensure protection against electric shock hazard by providing adequate protection for the terminals Check wiring and all safety functions To warrant protection against electric shock hazard, ensure that AC 230 V mains voltage is strictly separated from extra low voltage Engineering notes For additional information, especially on commissioning, refer to Basic Documentation P7871.2 The following types of burner controls can be used in connection with the RVW20...: LAL..., LFL..., LEC..., LGK16... and LOK16... ounting notes Ensure that the relevant national safety regulations are complied with After commissioning, check the flue gas values The RVW20... is designed for flush panel mounting with housing ARG61.010 wall mounting with housing ARG61.040: fitting the screw terminal base to the subassembly terminal 32 at the top terminal 2 at the bottom wiring to be made according to the plant connection diagram Installation notes Installation work must be carried out by qualified staff Prior to startup, check wiring and parameter settings carefully Commissioning notes Commissioning and maintenance work must be carried out by qualified staff After commissioning, check the flue gas values Disposal notes The unit contains electrical and electronic components and may not be disposed of together with household garbage. Local and currently valid legislation must be observed. 2/10
echanical design RVW20... Insert of plug-in design with European standard printed circuit boards 2 x 32-pin DIN connectors exchangeable relay board for controlling the actuators Supplied without housing Located on the front of the unit are: - LED 1 for fuel 1 - LED 2 for fuel 2-7-segment display (3 digits) for operating phases, burner output and fault indication Housing ARG61.0X0 ade of impact-proof plastic With a transparent cover To be ordered as a separate item (refer to «Ordering») Ordering Air / fuel ratio control unit - With data storage module RZD20 plugged in RVW20.000E27 Air / fuel ratio control unit RVW20.001E27 - For fuel changeover in operation and correcting variable authority of 50 % - With data storage module RZD20 plugged in Housings - For flush panel mounting, complete with ARG61.010 connection terminals and cover - For wall mounting, complete with ARG61.040 connection terminals and cover Accessories Handheld terminal - Complete with cable KF8859 (2 m) - For setting the parameters - For fault detection - For troubleshooting Separate cable for handheld terminal (20 m) AZW20.20 KF8860 Data storage module (2 pieces in one package (backup data carrier)) RZD20 Relay board 4 668 9846 0 - Exchangeable - Plug-in design Conductive plastic potentiometers for actuators refer to Data Sheet 7921 3/10
Technical data ains voltage AC 230 V ±15 % ains frequency 50 Hz ±6 % Power consumption 25 VA Plug-in system design D to DIN 41 612 Dimensions of RVW20... board 100 x 160 mm Connection terminals for 2 x 1.5 mm ² or 1 x 2.5 mm ² ounting position optional Safety class II to IEC 730-1 Degree of protection of housing - Front - Base Weight - With housing - Without housing IP 42 to IEC 529 IP 10 to IEC 529 approx. 1.4 kg approx. 0.75 kg Switching capacity of terminals L-Q1 - Current Switching capacity of terminals Q4-Q5 / H - Current at AC 230 V - Current at AC 24 V Extra low voltage inputs Hum voltage Terminals B1...B4 - Impedance Conductive plastic potentiometers - Resistance - Angular rotation - Refer to Data Sheet 7921 ing signal X3 - Internal resistance Switching capacity of control outputs Y1...Y6 - Current - Number of switching cycles at AC 230 V ±15 % 0.005...2 A AC 24...265 V 0.005...2 A 0.02...2 A max. AC 50 mv (50 Hz) 100 kω 1 kω 90...135 470 Ω Terminals +5 V - Amperage 1 ma Extra low voltage outputs terminal U10 - Current (all terminals) Terminals X2, U1 - Impedance AC 230 V ±15 % max. 5...150 ma eff. cos ϕ = 0.6: 13 x 10 6 cos ϕ = 0.8: 18.8 x 10 6 cos ϕ = 1: 20 x 10 6 DC 10 V max. 50 ma 25 kω 4/10
Control outputs Q2, Q3, Y10, Y20, F1, F2 on off - Current on signal X1 - Internal resistance AC 187...265 V < AC 50 V < 1 ma 100 Ω Environmental conditions Transport Climatic conditions echanical conditions Temperature range Humidity Operation Climatic conditions echanical conditions Temperature range Humidity IEC 721-3-2 class 2K2 class 22-25...+70 C < 95 % r.h. IEC 721-3-3 class 3K5 class 32 0...60 C < 95 % r.h. Condensation, formation of ice and ingress of water are not permitted! CE conformity According to the directives of the European Union Electromagnetic compatibility EC 89 / 336 EEC incl. 92 / 31 EEC Directive for gas appliances 90 / 396 EEC (level to EN 298) 5/10
Function General Parameter settings Supervision and display Startup Controlled operation Shutdown Correcting signal Compensation of hysteresis The RVW20... controls the actuators depending on the positioning signals delivered by the load controller according to curves whose parameters can be set for each type of fuel synchronously With the help of the handheld terminal AZW20.20 (to be ordered as a separate item) Setting the parameters of the setpoint curves Setting other plant parameters 3 channels For 2, 3 or 4 actuators Each with 2 setpoint curves, with a maximum of 17 breakpoints Can be parameterized and stored in nonvolatile memory: Ignition position -specific operating positions Other parameters Using the data storage module RZD20, the values can be transferred to other RVW20... If inadmissible operating states or system faults occur, the burner will be shut down During startup and shutdown, the RVW20... shows operating phases 0...9 on the display (during operation, the burner s output is displayed as a percentage) Faults are indicated by a flashing 2-digit code Burner startup is controlled by the burner control The RVW20... identifies the startup sequence during the startup phase, based on valve and fan control; the actuators are controlled accordingly checks the correct functioning of the connected components during the startup sequence runs to the parameterized ignition position to enable startup runs to the parameterized low-fire position after ignition After reaching the operating position, the burner control will enable the load controller The load controller controls the burner s output via the RVW20... The positions of the actuators will be reached based on the required burner output based on the selected type of fuel with the help of the parameterized setpoint curves The RVW20... drives the actuators to the calculated target positions The RVW20... drives the actuators to their start positions after burner shutdown on completion of the postpurge time, if scheduled Changes to the combustion parameters (e.g. density of air or quality of fuel) can be offset by connecting O2 trim control RPO25... to the input for the correcting signal the authority of the correcting variable can be parameterized The RVW20... offsets mechanical play between actuator and controlling element The authority of compensation of the hysteresis can be parameterized 6/10
Basic diagram RVW20 AIR1 Y1 X2 X2' ' AIR2 Y2 P AIR B1 FUEL1 B2 FUEL1 X1 FUEL2 Y3 Y4 P P B3 Fuel 1 FUEL2 U1 AUX1 FS Fuel 2 LR Y10 Y20 Integrator AUX2 Y5 Y6 P AUX B4 Programming Fuel select F1 F2 Q3 Q2 Control Q1 Q4 Q5 H 7871a06/0801 AZW20.20 FS FA Legend AIR Setpoint curves of the air damper actuators FUEL Setpoint curves of the fuel actuator AUX Setpoint curves of the auxiliary actuators H... Terminal markings (refer to «Connection diagram») B... Terminal markings (refer to «Connection diagram») LR controller F... Terminal markings (refer to «Connection diagram») Fan motor FA Burner control P Potentiometer FS Fuel selector Q...Y Terminal markings (refer to «Connection diagram») 7/10
Sequence diagram Phase 0 1 2 3 4 5 6 7 R 8 9 0 BETRIEB lim1 lim5 t4 SERVICE lim8 STOP STOP OPERATION Q3 G Q2 Y10 1) 5) 7) R Y20 1) 5) 5) 7) R Q1 Quit Q4-Q5 Ready Y1,Y3,Y5 Y2,Y4,Y6 SA SA X1 (0...10 V) 2) 4) 5) Burner 3) 2) Output A ax IgnPos 6) SA1 (AIR) in IgnitLo Z SA4 (AUX) A ax in IgnitLo 6) SA2 (FUEL1) SA3 (FUEL2) Z 7871d02/0801 Legend Signal must be present or output is under voltage 1) Signals at«y10» or «Y20» only act on output «X1» Signal may not be present or output is dead 2) Output «X1» gives the current air damper position 3) Output «X1» gives the current burner output Signal can be present 4) Output «X1» changes according to signals «Y10» Controlled output and «Y20» Prerequisite for changing to the next phase 5) Signals at «Y10» or «Y20» have no impact Phase Parameter setting phase 6) If ignition load «IgnitLo» is set to a level above the minimum burner output, the ignition load will be AIR Setpoint curves of the air damper actuators approached in phase 7 AUX Setpoint curves of the auxiliary actuators 7) Optionally «Y10 / Y20» or analog signal at «U1» for AZW... Handheld terminal controlled operation FA Burner control FS Fuel selector lim... Duration of phase is limited. If the sequence does not FUEL Setpoint curves of the fuel actuator change by the time the set period has elapsed, the unit will LR controller initiate lockout Fan motor lim1 = 30 s P Potentiometer lim5 = 75 s Q...Y Terminal markings (refer to «Connection diagram») lim8 = 30 s SA Actuators t4 Interval 8/10
Connection terminals ains voltage side Extra low voltage side Q5 Q4 +5 V H Y6 Q3 Y5 Y10 Y20 N Q2 Q1 Y4 Y3 F1 Y2 F2 Y1 N N L L X1 U1 U10 B4 U10 B2 X2 U10 B3 U10 B1 7871a03/0901 Legend Terminal Input / Voltage Description output B1 I Feedback signal air damper actuator B2 I Potentiometer (wiper) fuel actuator (Fuel 1) B3 I Potentiometer (wiper) second fuel actuator (Fuel 2) B4 I Potentiometer (wiper) auxiliary actuator (AUX) F1 I AC 230 V Selection of fuel: fuel 1 F2 I AC 230 V Selection of fuel: fuel 2 L I AC 230 V Live for internal power supply, actuator outputs and «Q1» --- --- Reference potential for all low voltage inputs / outputs and for screening (all -terminals are internally interconnected) N I --- Neutral conductor for internal power supply, reference potential for the mains voltage inputs (all N-terminals are internally interconnected) Q1 O AC 230 V Acknowledge signal: indicates when certain actuator positions are reached Q2 I AC 230 V Signal from the burner control: first fuel valve on / off Q3 I AC 230 V Signal from the burner control: fan on / off Q4-Q5 / H O Potentialfree Readiness contact or nonreadiness / control loop: indicates when the RVW20... is ready to operate U1 I Signal input for analog burner output control U10 O DC 10 V Power supply for the potentiometers (all «U10» terminals are internally interconnected) X1 O Burner load signal X2 I Correcting signal of O2 trim control RPO25... Y1 O AC 230 V ing signal (open) (3-position control of actuators) Y2 O AC 230 V ing signal (closed) (3-position control of actuators) Y3 O AC 230 V ing signal (open) (3-position control of actuators) Y4 O AC 230 V ing signal (closed) (3-position control of actuators) Y5 O AC 230 V ing signal (open) (3-position control of actuators) Y6 O AC 230 V ing signal (closed) (3-position control of actuators) Y10 I AC 230 V Signal for increasing the burner s output (from the 3-position controller) Y20 I AC 230 V Signal for decreasing the burner s output (from the 3-position controller) +5 V O DC 5 V Auxiliary voltage, max. 1 ma 9/10
Dimensions Dimensions in mm Housing ARG61.040 for wall mounting Housing ARG61.010 for flush panel mounting 7871m03/0598 10/10 2001 AG Subject to change