115 V
230 V
!
!
!
Operation / Maintenance
13
8. Operation
8.1 Connecting to the mains
Only attach this unit to mains sockets with a grounded earth.
Compare the local mains voltage with the specifications
given on the name plate. Voltage deviations of +/- 10% are
permissible. The socket must be rated as suitable for the to-
tal power consumption of the unit.
8.2 Flow-through cooler DK15
WARNING:
The flow-through cooler must only be used with heat transfer
liquids with a freezing point below –30°C. If the heat transfer
liquid were to freeze in the heat exchanger of the DK15, the
resulting volume expansion could cause the heat exchanger
to burst. Heat transfer liquid would then seep into the coolant
circuit and this would irreparably damage the compressor.
The danger of freezing of an unsuitable heat transfer liquid
is also present at temperatures well above 0°C in the circuit
between the circulator and the cooler: Any interruption of the
flow (hose kink, pump failure etc.) results in the cooling of the
liquid within the heat exchanger to below –20°C and the sort
of damage mentioned above.
The flow-through cooler must also be switched off
if the circulator is shut down!
8.3 Immersion coolers EK20 and EK30
If pure water or water plus a small amount of antifreeze is
used as the heat transfer liquid, a thick coating of ice can
form on the coil.
This clearly reduces the cooling capacity of the immersion
cooler.
Remove ice by heating up if necessary. Do not re-
move the ice mechanically!
9. Maintenance
Regular cleaning ( 2 to 4 times a year according to degree
of dust) is required to ensure a constantly high cooling ca-
pacity.
The liquefier fins should by cleaned using compressed air.
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