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Straight-Tube Heat Exchanger baelz 111 / baelz 112
● Foranaccuratemeasurementofstaticpressure,selectalocationwithsteadyow.Forthebest
measurement conditions, arrange deburred holes of 3 to 5 mm diameter in straight pipelines and
perpendiculartothedirectionofow.Thedistancetottingsordeectionsshouldbeatleast10to20
times the pipeline diameter.
The performance and correct functioning of a heat exchanger system must be monitored by measuring pressure,
temperatureandowratewithsufcientlyaccuratemeasuringequipment.Thedatacollectedinthiswayis
indispensable for possible service cases. Baelz therefore recommends installing the following measuring
equipment in addition to the supply sensors and limit thermostats:
1. 1 thermometer each for steam inlet and condensate outlet.
2. 1 thermometer each for secondary inlet and secondary outlet.
3. 1 manometer each for steam inlet and condensate outlet.
4. 1 manometer each for secondary inlet and secondary outlet, or at least suitable measuring connection
piece for the later connection of a manometer.
5. 1condensatemeter,oratleastonettingpieceforacondensatemeter,sothatatemporarymeterfor
maximum quantity setting can be installed during initial commissioning.
6. 1warmorhotwatermeteroronemeasuringoriceforthesecondarycircuit.
The necessary calming section must be available for all quantity measuring devices.
4.3 Arrangement of the control system
● Theassemblyplanspeciesthearrangementandfunctioningofthecontrolsystem.Asampleassembly
plan can be found in Fig. 5, page 20.
●Proper drainage of the steam inlet pipe is particularly important for steam heat transfer stations. This is
theonlywaytopreventwaterhammer,whichshortenstheservicelifeofthesystem.Theminimumow
rate on the secondary side in low load operation must also be guaranteed.
●Do not switch off circulating pumps until the condensate valve is closed and the condensate backup has
completely covered the heating surface.
●Night setbacks may not all take effect simultaneously when several circuits are present. The heat
exchanger can also be controlled according to the coldest circuit depending on the weather. This ensures
aminimumwaterowrate.
●See the operating instructions for each device to learn more about its control function.
4.4 Electrical wiring of the measuring and control devices as well as the automatic t-
tings
●An operating manual is enclosed with each individual device. If this individual device requires electrical
auxiliarypower,youwillndtheelectricalcircuitdiagramintheoperatinginstructions.
●If you have ordered a Baelz switchboard or a Baelz switch cabinet, the circuit diagram tailored to your
individual control circuit will also be supplied. Examples of typical system diagrams can be found on
pages 22 and 23.
●However, if you would like to receive an introduction to the system components supplied by us, please
contact Baelz customer service.
4.5 Filling of the system
● Thequalityrequirementsforthellingwaterdependonthetemperatureandheatingsurfaceload.
●For information on the required water quality, please see Chapter 2.5
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