Operating instructions

Note the following:
 Temperature control tubes: Always use the largest possible
diameters and shortest possible tube lengths in the external
circuit.
If the temperature control tube diameter is too small, a tem-
perature drop between device and external consumer occurs
due to flow rate too low. In this case, increase or lower the tem-
perature accordingly.
 Secure the temperature control tubes with hose clamps.
 If the external consumer is at a higher level than the device,
emptying of the external volume can occur if the pump is
stopped and there is ingress of air in the external liquid circuit
even for closed circuits. In this case, there is the risk of the
device overflowing.
 In the event of tube rupture, hot liquid can escape and become
a danger for persons and material.
4.4 Cooling water
4.4.1 Cooling water requirements
There are specific requirements for the cooling water concerning
its purity. In accordance with the cooling water requirements, a
suitable process for treatment and maintenance of the water must
be used. The condenser and the complete cooling water circuit can
be clogged, damaged and leak due to unsuitable cooling water.
Extensive consequential damage to the complete refrigerant circuit
can occur. The cooling water quality is dependent on the local con-
ditions.
 Free chlorine, e.g. from disinfectants and water containing
chloride results in pitting corrosion in the cooling water circuit.
 Distilled, deionised or demineralised water is not suitable due
to its corrosive properties and results in corrosion in the cooling
water circuit.
 Seawater is not suitable due to its corrosive properties and
results in corrosion in the cooling water circuit.
 Water containing iron and iron particles in the water result in
rust formation in the cooling water circuit.
 Hard water is not suitable for cooling due to the high lime con-
tent and results in calcification in the cooling water circuit.
 Cooling water with suspended matter is not suitable.
 Untreated, not purified water, e.g. river or cooling tower water
is not suitable due to its microbiological content (bacteria)
which can settle in the cooling water circuit.
Data Value Unit
pH value 7.5 – 9.0
Sulphates [SO
4
2-
]
< 70 mg/L
General requirements
Suitable cooling water quality
Before commissioning
Variocool 27