Boiler house Level controls
2
Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2020
AI-P693-34 EMM Issue 1
LCSR4000 Level Control Systems
Typical installation This document does not contain sufficient information to install the system safely. See the Installation and Maintenance Instructions supplied with the products for full details. The Spirax Sarco LCSR4000 boiler water level control and alarm system is suitable for automatically controlled steam boilers and provides the control and alarm functions specified by Standard BS EN12953 and in the BG01 which is a joint document by the CEA and SAFed, originally produced in consultation with the HSE. The low level alarms are of the high integrity type and whilst a competent boiler operator should check the plant daily, he need not be on site at all times. There should, however, always be someone available on site who is suitably trained to respond to alarms and take appropriate action. The level controls and level alarms are probably the most important controls on the boiler for ensuring safety and should only be installed and maintained by suitable trained personnel. Spirax Sarco can install, commission and provide a regular maintenance service.
LCS3050 controller
2.3 12
LP21 probe / PA420 preamplifier
LP40 probe
LP40 probe
LCS3050 30 µS/cm or 30 ppm LCR2652/ BHD50 and LCR2250 5 µS/cm or 5 ppm
Boiler
Minimum conductivity
Note: Consult Spirax Sarco if conductivity is less than 100 µS/cm and is likely to vary by more than 2:1
High alarm
Weekly test High integrity self-monitoring level alarms do not require daily testing but the weekly test should be carried out or witnessed by a responsible person who appreciates the hazards involved and has been suitably trained in the safe operation of the boiler and its controls. At no time during the test should the water be lowered to the extent that it disappears from the gauge glass. 1. With the feedpump switched off, or the control valve forced closed, allow the water level to fall by evaporation until the burner and the panel lockout at the low alarms. 2. Raise the water level to normal, reset the lockout and allow the burner to refire. 3. To independantly test inputs of a 2 probe system external test buttons have to be installed that create low level alarms on each probe input. For each probe input press the test button and ensure the burner shuts down, afterwards reset the lockout and allow burner to refire. 4. Include in monthly test - Under hand control raise the water level to the high alarm level. Check that the high alarm sounds. 5. Return all valves and controls to normal and monitor the boiler until satisfied that it is operating normally.
Modulating control band
Protection tubes
LCR2652 / BHD50 controller
LCR2250 controller
LCR2251 controller
or
Feedwater control valve
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