Boiler house
Level controls
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 2014
AI-P402-09
AB Issue 7
LCS1100
Level Control Systems
Installation and testing
of on/off boiler water level controls direct mounted in the boiler
Typical installation
Warning: This document does not contain sufficient information
to install the system safely. See the Installation and Maintenance
Instructions supplied with the individual products for full details.
The Spirax Sarco LCS1100 boiler water level control systems are
suitable for automatically controlled steam boilers and provide the
control and alarm functions specified by British Standards in
BS 2790, by the Health and Safety Executive in PM5, and by
SAFed (PSG2).
The LCS1100 series systems require daily manual testing as
specified in PM5 and a trained boiler attendant should be on site
at all times the boiler is in operation.
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 suitably trained personnel. Spirax Sarco
can install, commission and provide a regular maintenance service.
Minimum conductivity
Nominal 1 μS/cm @ 25°C minimum.
Daily test
The 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, allow the water level to fall by
evaporation until the burner shuts down at 1st low alarm.
2. Blow down the boiler until the 2nd low alarm sounds and the
burner controls go to lockout.
3. Raise the water level to normal, reset the lockout and allow the
burner to refire.
4. 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.
Quarterly inspection
The Health and Safety Executive recommend from experience
that the boiler controls should be serviced at least at quarterly
intervals. Where the regular tests are carried out properly in a well
run boiler house with good water treatment, it may be that only
an annual inspection of the probes etc. is required. This is a
matter, however, for the user to decide in liaison with his insurance
company inspector in order to determine a sensible inspection
programme to suit the individual boiler plant.
We recommend a regular inspection as follows:
1. Inspect the probe plugs for moisture.
2. Unscrew the probes and wipe away any dirt from the probe
tips. If any hard scale is present it may be an indication of
more serious scale formation elsewhere in the boiler.
Investigate water treatment.
3. Inspect the wiring and controllers for damage.
4. Reassemble and carry out a full functional check.
LC1350
AL
OK
LC1350
controller
LP10-4
probe
LC1350
AL
OK
LC1350
controller
LP10-4
probe
Not
used
Boiler
High alarm
Pump off
Pump on
1st Low
2nd Low
Not
used
Protection tubes
2.3.8
