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CC1N7435en
11.01.2007
Burner Controls
Burner controls for the supervision of 1- or 2-stage gas or gas / oil burners of
small to medium capacity (typically up to 350 kW), with or without fan, in intermit-
tent operation.
The LGB... and this Data Sheet are intended for use by OEMs which integrate the
burner controls in their products!
The LGB... burner controls are used for the startup and supervision of 1- or 2-stage gas
or gas / oil burners in intermittent operation.
Depending on the type of burner control used, the flame is supervised either by an
ionization probe, a blue-flame detector QRC1... for forced draft gas / oil burners, or a
Uv Detector Qra... (with auxiliary unit AGQ1...A27).
In connection with the respective adapters, the LGB... burner controls replace their
predecessor types LFI7... and LFM1... (also refer to «Replacement types» under «Or-
dering»).
Automatic forced draft burners for gaseous fuels to EN 676
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Gas burner controls to EN 298
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Undervoltage detection
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Air pressure supervision with function check of the air pressure switch during
-
startup and operation
Electrical remote reset facility
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LGB41... for use with atmospheric gas burners
-
7
LGB...
Building Technologies
HVAC Products
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Table of Contents
Related Manuals for Siemens LGB21.130A17
Summary of Contents for Siemens LGB21.130A17
- Page 1 Burner Controls LGB... Burner controls for the supervision of 1- or 2-stage gas or gas / oil burners of small to medium capacity (typically up to 350 kW), with or without fan, in intermit- tent operation. The LGB... and this Data Sheet are intended for use by OEMs which integrate the burner controls in their products! The LGB...
- Page 2 Warning notes To avoid injury to persons, damage to property or the environment, the following warning notes should be observed! Do not to open, interfere with or modify the unit! • All activities (mounting, installation and service work, etc.) must be performed by qualified staff •...
- Page 3 Electrical connection of flame detectors It is important to achieve practically disturbance- and loss-free signal transmission: • Never run detector cables together with other cables – Line capacitance reduces the magnitude of the flame signal – Use a separate cable •...
- Page 4 F M L L X N with 2-stage operation - LGB41... A B L L X N with 2-stage operation («BV1 + BV2» or «ZBV + BV2») A M L L X N with 1-stage operation LGB21.130A17 LGB21.130A27 LGB21.230A27 LGB21.330A27 LGB21.350A17 LGB21.350A27...
- Page 5 Mechanical design The housing is made of impact-proof, heat-resistant and flame-retarding plastic. It is of plug-in design (measuring 91 x 62 x 63 mm, including the base) and engages audibly in the base. The housing accommodates the programming mechanism with the synchronous motor electronic flame signal amplifier (ionization) with the flame relay and the other switching devices lockout reset button with its integrated fault indication lamp...
- Page 6 Ordering Burner control, without plug-in base refer to «Type summary» Connection accessories for small burner controls refer to Data Sheet N7201 Plug-in base AGK11... Cable holders AGK65..., AGK66, AGK67... Cable strain relief elements for AGK67... Connection accessories for small burner controls refer to Data Sheet N7203 Plug-in base AGK13...
- Page 7 Technical data General unit data Mains voltage AC 220 V –15 % ...AC 240 V +10 % LGB... (LGB2... / LGB4...) AC 230 V –15 % / +10 % (LGB32...!) AC 100 V –15 % ...AC 110 V +10 % Mains frequency 50...60 Hz ±6 % Input current at terminal 12...
- Page 8 Flame supervision Flame supervision with At mains voltage U = AC 230 V ≤ U ionization probe Detector voltage across terminals 1 and 2 or ground (AC voltmeter Ri ≥ 10 MΩ) Detector current required for reliable operation min. 3 µA Possible detector current in operation max.
- Page 9 Flame supervision with Perm. detector current during the prepurge max. 5 µA time (dark current) blue-flame detector QRC1... Detector current required during min. 50 µA operation Possible detector current in operation max. 80 µA Measuring circuit with the QRC1... LGB3... Legend Microammeter Ri max.
- Page 10 Flame supervision with UV detector QRA... and auxiliary unit AGQ... for LGB21... / LGB22... / LGB41... UV detector QRA... Universal flame detector for use with gas and gas / oil burners. Incidence of light from the front and laterally, total length 97 mm. Available with normal or, as QRA2M, with higher sensitivity.
- Page 11 Functions The function diagrams show the required or permissible input signals to the control section and to the flame supervision circuit hatched (refer to «Connection diagrams»). If these input signals are not present, the burner control will stop the startup sequence to trigger lockout where required by safety regulations.
- Page 12 Postignition time Ignition time during «TSA» Just before reaching the end of «TSA», ignition transformer «Z» will be switched off. This means that «t3n» is somewhat shorter than «TSA». This is necessary in order to give the forcedly closed flame relay «FR» suffi- cient time to drop out if there is no flame.
- Page 13 In principle, whenever lockout occurs, the fuel supply will immediately be shut down. If Control sequence in the event of fault that takes place between startup and preignition, which is not indicated by a symbol, the usual cause is air pressure switch «LP» shutting down, or a premature, faulty flame signal.
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Page 14: Connection Diagrams
Connection diagrams LGB21... Flame supervision LGB21...: With ionization probe or auxiliary unit AGQ1...A27 for UV detector Burner controls for 1- or 2-stage forced draft burners. Air damper control for prepurging with low-fire air volume. QRA... B B´ GP/SB Dbr1 GP/SB 7435f01/1299 LGB2... - Page 15 Connection diagrams (cont’d) LGB21... SQN7...244 / 2-stage control Burner without fan and without «LP» QRA... with auxiliary unit AGQ1... with LGB21... (diagram 7435a06) AGK25 GP/SB 7435a04/0398 bl rt AGQ1 sw Burner with fan control via auxiliary contactor («HS») with «LP» 7435a06/0704 Legend GP/SB...
- Page 16 Connection diagrams (cont’d) LGB22... / LGB32... Flame supervision Burner controls for single- or 2-stage forced draft burners. LGB22...: With ionization probe or auxiliary unit AGQ1... for UV detector Air damper control for prepurging with nominal load air volume. QRA... LGB32...: With blue-flame detector QRC1... B B´...
- Page 17 Connection diagrams (cont’d) LGB22... / LGB32... LGB22... LGB22... SQN7...454 / 2-stage control SQN7...424 / 2-stage control Single-wire control 2-wire control Burner without fan and without «LP» QRA... with auxiliary unit AGQ1... with LGB22... (diagram 7435a06) LGB22... / LGB32... GP/SB bl rt AGK25 AGQ1 sw 7435a04/0398...
- Page 18 Connection diagrams (cont’d) LGB41... Burner controls for atmospheric gas burners with or without fan. No actuator control. Flame supervision with ionization probe B B´ GP/SB 7435f03/0301 QRA... with auxiliary unit AGQ1... with LGB4... (Pictures 7435a21) Dbr2 Dbr1 GP/SB bl rt AGQ1 sw 7435a21/0704 7435a11/0704...
- Page 19 Internal diagram and time diagram of the programming mechanisms LGB21... Legend Alarm Load relay with contact «ar» Unit fuse Locking relay with contact «br» BV... Fuel valve Dbr1 Wire link EK... Lockout reset button Flame relay Gas pressure switch Mains isolator Ionization probe b a b Lockout warning lamp...
- Page 20 Internal diagram and time diagram of the programming mechanisms (cont’d) LGB22... / LGB32... Legend Alarm Load relay with contact «ar» Unit fuse Locking relay with contact «br» BV... Fuel valve 6 11 EK... Lockout reset button Flame relay Gas pressure switch Mains isolator Ionization probe Lockout warning lamp...
- Page 21 Internal diagram and time diagram of the programming mechanisms (cont’d) LGB41... Legend Alarm Load relay with contact «ar» Unit fuse Locking relay with contact «br» BV... Fuel valve Dbr1 Wire link Dbr2 Wire link terminal 6-2 required when contact «bv» or «zv1» is missing EK...
- Page 22 Dimensions Dimensions in mm LGB... Plug-in base AGK11... / AGK13... 41,5 Auxiliary unit Type Dimension AGQ1...A27 reference AGQ1.1A27 AGQ1.2A27 90,5 7435m01/0301 © 2007 Siemens Building Technologies HVAC Products GmbH Subject to change! 22/22 Building Technologies CC1N7435en HVAC Products 11.01.2007...