Behncke PWT 510 Instrucciones De Operación página 73

8 Troubleshooting
Fault
No heat exchange
Insufficient heat exchange
Increased pressure loss
Low temperature at the
secondary circuit outlet
Leakage (in general)
Leakage (especially when cold)
Frequently occurring encrustation
(when producing service water)
Heat exchanger PWT 510 / PWT 910 / Troubleshooting
Cause
Stop valves closed
Pumps not connected
Pump connected but doesn't
rotate
Filter blocked
Heat regulator defective or
incorrectly calibrated
Air bubbles in both circuits
Dirt deposits or encrustations in
both circuits
Primary circuit temperatures
lower than program values
Primary circuit delivery rate lower
than program value
No countercurrent
Encrustation and/or blockage
Secondary circuit delivery rate
lower than program value
Calcium or dirt deposits on and
under the seal
Seal broken or worn
Maximum pressure higher than
permitted (see data plate)
Heat exchanger closing rate
possibly higher than specified
(see chapter 3.2)
Heat exchanger closing rate
possibly higher than specified
(see chapter 3.2)
Heat exchanger consistently
in temperature condition, e.g.
Connected in series with the
heating system or with consist-
ently running pump. It can also be
spontaneous circulation.
Remedy
Open valves
Connect pumps
Loosen pump wheel
Clean filter
Repair heat regulator or set
correctly
Bleed circuits
Dismantle heat exchanger and
clean plates
Increase primary circuit
temperature or number of plates
Install suitable pump
Correctly connect pipe to the heat
exchanger again
Dismantle heat exchanger and
clean plates
Restrict the secondary circuit
inlet valve
Carefully remove every trace of
dirt and chalk
Replace seal
Lower pressure to specified
values
Close plate package after
specified minimum value
CAUTION: The heat exchanger
must no longer be pressurised
after the closing process.
Close plate package after
specified closing rate
(see chapter 3.2).
CAUTION: The heat exchanger
must no longer be pressurised
after the closing process.
Install the heat exchanger
correctly, making sure that it
remains cold, or at least does
not exceed 48°C if this isn't
necessary; provide suitable
retention valves.
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