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W. Baelz & Sohn GmbH & Co.
· Koepffstrasse 5 · 74076 Heilbronn · Germany ·
www.baelz.de Seite | Page
Straight-Tube Heat Exchanger baelz 111 / baelz 112
8. TROUBLESHOOTING
Problem
Possible cause
Solution
temperature / pressure too
high
heating capacity too high
check control system and correct if
necessary
leaking control valve
check valves and repair or replace if
necessary
greatly reduced power requirement or
manual control valve designed too large
throttle by means of manual control
valve
or replace manual control valve
(see also chapter 5.2: During
commissioning)
reduced heat exchanger
performance
intended operating conditions not fulfilled
check temperature, pressure and
flow of heating medium
too little heating medium flows through
heat exchanger
●
check strainer and clean if
necessary
●
check opening of the isolating
valves and correct if necessary.
●
check pipeline resistance
differential pressure too low /
control valve and associated fittings
designed too small
re-design all fittings according to
existing differential pressure
increased flow rate on the secondary side
(lower temperature difference is not due to
reduced heat exchanger performance)
reduce flow rate on the secondary
side
heat transfer surface dirty
clean heat exchanger (see chapter
6.3: Cleaning the heat exchanger)
control valve remains in
OPEN position only very
briefly
condensate limiting thermostat set too low
or defective
check the setting or function and
correct it
cooling of the heating medium too low
Check whether the secondary
return temperature corresponds
to the design temperature, if so,
contamination of the heat transfer
surface is probable (see chapter
6.3: Cleaning the heat exchanger)
