Integral XT
92
Starting up
YAWE0028 / 24/06/2016
+
−
Low viscosity heat transfer liquids: e.g. thin-bodied oil, water-glycol.
−
Short hose connections with a large cross-section.
The flow resistance is then low and a large amount of thermostatic medium can
be pumped in a short time. In addition, the circulation time is short.
−
Select a sufficiently high pump level (pump pressure):
LAUDA device
Pump level
XT 150
2 – 6
XT 750
4 – 8
−
Observe the return temperature (an external return temperature sensor can be
connected via the analog interface, accessory): During the heating up phase
(100 % heating power) the difference temperature Outflow - Return temperature
should less than 5 – 7°K.
−
If the flow through the hydraulic circuit is too low,
then on heating up the warning
WXArn 332
or on
cooling the warning
WXArn 007
is triggered.
−
An adjustable bypass can be connected to prevent
these warnings. The bypass ensures that the flow in
the thermostat is maintained such that the controller
can operate properly. More measures (
þ
9.4).
7.15.1 Setting instructions for bypass
When the warnings described in the previous section appear, a bypass can be connected which passes a
partial flow from the thermostat output directly to the input. Set the optimum bypass flow as follows:
−
Depending on the pump level according to the table, reduce the pressure by opening the bypass.
The specified values should also be sufficient if no flow was previously present. If the pressure
with the bypass is too low, close the bypass slightly. If warnings occur, the bypass must be
opened further again.
Pump level
1
2
3
4
5
6
7
8
Pressure reduction 0.25 0.3
0.35 0.4
0.45 0.5
0.5
0.5
−
Keep this setting also with a changed pump level or also with pressure control.
Flow warning
WXArn
°C
Flow warning
007
°C
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