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In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2020
Level Controller, Operating and Display Unit
Description
The functional unit consisting of the operating and display unit BHD50 and the LCR2652 level controller in conjunction with level
transmitter LP20/LP21/PA420 is used as water level controller and as a limit switch, for instance in steam boilers, (pressurized) hot-
water installations as well as condensate and feedwater tanks. One BHD50 can be used with a LCR2652 and a BCR3250 controller to
provide a combined level and TDS control system.
A level limit switch (LCS3050 and/or LCS3051) can be connected to the LCR2652 to signal and log level alarms on the BHD50.
The LCR2652 level controller processes the level-dependent current signal from the LP20/LP21/PA420 level transmitter. This input
signal is recognised by the controller as 0 and 100 % of the boiler measuring range.
The operating and display unit BHD50 and the level controller LCR2652 form a functional unit featuring the following properties:
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3-position stepping controller with proportional-plus-integral
control action (PI controller) and control of an electrically
actuated control valve (VMD - Valve Motor Drive)
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Continuous controller as PI controller for the control of an
electro-pneumatically operated control valve and a relay for
pump ON/OFF control
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Indication of MIN/MAX water level limit
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Fill or discharge control
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Level damping filter
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Current inputs for steam and feedwater flowrate (2 or
3-element control)
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Actual value output 4-20 mA
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Level limit switch alarm input (24Vdc), to display the status
of any LCS3050 or LCS3051 level limit switch
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Indication of actual value (indicated in percent and as
bar graph)
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Standardized measuring range when the level transmitter
LP20/LP21/PA420 is connected
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Indication/adjustment of control parameters
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Adjustment and evaluation of current inputs for steam and
feedwater flowrate (2 or 3-element control)
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Trend record
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Indication and listing of errors, alarms and warnings
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Test of MIN/MAX output relays
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Manual/automatic operation
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Modbus RTU (RS232, RS422 or RS485) and Modbus TCP
(Ethernet 10/100Mb) communication
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Password protection
Local regulations may restrict the use of this product to below the conditions quoted.
LCR2652 BHD50
Typical applications
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BHD50
Steam Boilers
Hot-Water Installations
Condensate and Feedwater Tanks
TI-P693-24
EMM Issue 1
Page 1 of 6
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Summary of Contents for Spirax Sarco LCR2652
- Page 1 LP20/LP21/PA420 is used as water level controller and as a limit switch, for instance in steam boilers, (pressurized) hot- water installations as well as condensate and feedwater tanks. One BHD50 can be used with a LCR2652 and a BCR3250 controller to provide a combined level and TDS control system.
- Page 2 –20 ... +70 °C, defrosting time of the de-energized equipment before it can be put into operation: 24 hours Relative humidity max. 95%, no moisture condensation TI-P693-24 Page 2 of 6 EMM Issue 1 LCR2652 BHD50 Level Controller Operating and Display Unit...
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Page 3: Wiring Diagrams
Wiring diagrams Wiring diagram (LCR2652) - Valve Motor Drive Controller (VMD) ALARM CLOSE OPEN M 0.5 A (semi-delay) LP20/LP21/PA420 Fig. 4 Item Fixing screws for terminal strip MIN output contact, de-energizing delay: 3 sec. Output contacts for activating the control valve. External link wire necessary for function MAX output contact, de-energizing delay: 3 sec. - Page 4 Central earthing point (CEP) in control cabinet Earthing point at the auxiliary equipment (e.g. PA420/LP20/LP21) Input for level limit switch (24Vdc), ON = alarm, OFF = normal water level TI-P693-24 Page 4 of 6 EMM Issue 1 LCR2652 BHD50 Level Controller Operating and Display Unit...
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Page 5: Directives And Standards
Directives and standards VdTÜV Bulletin "Wasserstand 100" (Water Level 100) The functional unit consisting of the operating and display unit BHD50/level controller LCR2652 in conjunction with level transmitter LP20/LP21/PA420 is type approved to the VdTÜV Bulletin "Water Level 100". The VdTÜV Bulletin "Wasserstand (Water Level) 100" specifies the requirements made on water level control and limiting equipment for boilers. - Page 6 Level Controller with Operating and Display Unit, 4 volt-free change-over contacts for MIN/MAX alarm & control valve supply voltage 24V DC 4W. How to order Example: 1 off Spirax Sarco LCR2652 Level Controller, 1 off Spirax Sarco BHD50 Operating and Display Unit. TI-P693-24 Page 6 of 6...
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