Cooling
74
HAAKE Phoenix II P1
Version 3.07
20. Cooling
The refrigerated bath is used mainly for enabling lower than
ambient or tap water temperatures in circulators or for cool-
ing a heated bath down to a low temperature level very
quickly.
The working temperature range is shown in the technical
specifications.
Safety measures have been taken in order to avoid
an excessively high temperature in the cooling cir-
cuit which would then result in the excess temper-
ature protection being triggered and the compres-
sor being switched off.
The cooling capacity is controlled according to the heat
removal requirements. At bath temperatures >70
°
C the coo-
ling unit is operated with basic cooling, at temperatures
>100
°
C the unit is switched off (exceptions see 14.6 Working
with or without cooling).
20.1 Deviations in refrigeration output
The refrigeration performance is checked under the ambient
conditions described in Section 4.
If the refrigeration output falls below the level stated in the
unit’s documentation, the cause may be one of the following:
•
Excessively high ambient temperature
⇒
The maximum refrigeration output is calculated
for the ambient conditions described in
Section 4.
Any increase in ambient temperature reduces
the refrigeration output.
•
Reduced heat extraction from the refrigerator
⇒
In the case of air-cooled units, it is possible that
the ventilation grilles are dirty or that the gap
between them is too small.
For ventilation and maintenance see chapter 7.5
or 21.1.
⇒
In the case of water-cooled units, it is possible
that the coolant water is too hot or insufficient in
quantity, or that it is under insufficient pressure
(see chapter 8.6)
•
The bath medium in use, such as ethanol, gradually
absorbs water and forms an insulating layer (ice) on the
condenser. This reduces the refrigeration output.
•
Low mains voltage reduces the output of the
refrigeration unit.
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