Bühler technologies BWT Serie Guía Rápida página 5

BWT
The designation of the connections on the plate heat ex-
changer is indicated in the nameplate. Please refer to the
decal for the connection position.
Soldered compact heat exchangers are connected parallel
with counter flow. The circuits to be connected must be
flushed prior to making the connection.
The piping to and from the plate heat exchanger must have
shut-off valves. In addition, venting must be provided at the
highest position in the upper connections, and drains in the
lower connections.
When connection the plate heat exchanger, be sure the seals
in the screw connections are clean.
5 Operation and control
NOTICE
The device must not be operated beyond its specifications.
5.1 During starting
Before operation it must be checked that the operating data
does not exceed the data indicated on the marker's name-
plate. Furthermore all bolted connections must be checked for
tightness.
CAUTION
Hazard due to high pressure of the pump
Do not exceed the nominal pressure.
Install safety valves (pressure relief valves) to pumps that
generate higher pressures.
The pumps feeding the plate heat exchanger must be
equipped with control valves. Pumps which generate pres-
sures higher than those specified for the unit must be
equipped with safety valves. The water pump must not suc-
tion air to preclude operating faults through water hammers.
5.2 Start-up the heat exchanger
NOTICE
Pressure surges should be avoided!
To avoid hydraulic shocks the pumps should be started up
against minimal opened valves. The valves in the supply and
the return lines should be opened slowly, if possible simultan-
eously.
5.3 Venting / Ventilation of the heat exchanger
During the filling process the unit must be vented through
the vent valves installed in the piping. Plate heat exchangers
which are not vented to a sufficient degree do not achieve full
performance because the heating surface is covered by air.
Furthermore the corrosion risk increases when air remains in
the unit.
5.4 Shut-down the heat exchanger
The two sides should be shut-down simultaneously and
slowly. If this not possible the hot side should be shut down
first.
If the cooler is shut down for a long time it should be drained
completely and cleaned. The should be specially when there is
a danger of frost and when aggressive media are involved.
BX340001 ◦ 08/2019
6 Maintenance
Always observe the applicable safety- and operating regula-
tions when performing any type of maintenance. Please refer
to the original operator's manual on the included CD or online
at www.buehler-technologies.com for maintenance informa-
tion.
7 Service and Repair
Please refer to the original operator's manual on the included
CD or online at www.buehler-technologies.com for a detailed
description of the unit including information on
troubleshooting and repair.
Bühler Technologies GmbH 5