27
Caution:
Securely attach all tubing to prevent slipping.
Connecting the external system:
•
Remove the cap nuts from the pump connectors
(13, 14) and using tubing connect the external
system (M16x1 / wrench 19 mm).
To prevent the formation of bubbles in the loop
circuit, the pressure line (13) is to be connected
to the lower nozzle of the external system.
Also see the description on page 22
•
Connect a piece of tubing to the overflow
connector (15) and drain into a suitable vessel.
(M16x1 / wrench 19 mm), which always has to
be placed lower than the exit „Overflow“.
•
If required, the connector (16) may be used for
connecting an expansion vessel. (M16x1 /
wrench 19 mm)
The use of an expansion vessel is depending on
the highest temperature and the volume of the
bath liquid in the loop circuit.
(see diagram 1 page 24).
•
Close the expansion vessel with the cover Das
Order No. 8 970 831 Expansion vessel 5 liters
Note:
At the desired highest temperature, drain overflowing bath liquid into a
suitable vessel via the connector (15). If at the desired lowest
temperature, low liquid level alarm is not triggered, there is no need to
use an external expansion vessel.
Important: Leakage on shaft sealing
The shaft sealings of the pump are never absolutely tight. But this does
not have an impact on the proper functioning of the instrument. The
slight leakage that appears ensures good sliding properties of the
sealing. Any excess fluid is drained via the overflow connector (15).
Warning:
An external expansion vessel is heated up by the wam outgoing air, especially in
small rooms or if there is not enough distance between the wall and the unit.
In this case only bath liquids with a fire point of
≥
100 °C are allowed to be used.
Summary of Contents for Presto Plus LH 47
Page 20: ...Operating controls and functional elements 20 Rear...
Page 41: ...41...
