Data Sheet

Technical System Catalogue/Climate control
Chillers – General instructions
3 - 52
Assembly and commissioning
When siting the chillers, the following points should be
observed:
 Connection of an inlet and outlet duct requires the manu-
facturer’s prior consent.
− Performance loss (air-cooled chillers)
 Never site the chiller in the vicinity of a heater.
− Performance loss.
 The chiller may only be sited on flat, solid surfaces. The
maximum permissible deviation from the vertical is 2°.
 Connect the equipment to the chiller using insulated pipe
or hose connections.
 If the equipment is positioned higher than the chiller,
install a non-return valve in the upstream inlet and a mag-
netic valve in the return to prevent the tank from overflow-
ing.
 With chillers that are intended for covered outdoor siting,
the minimum external temperature should be taken from
the technical specifications.
 In the case of chillers (for water) at temperatures below
0 °C, a water/glycol mixture should be added in the pre-
scribed ratio.
 If it is possible to shut off the equipment cycle, a bypass
must be provided in order to protect the pump.
 Under no circumstances must the circulation pump be
allowed to run dry.
− Damage to the pump.
Distance from equipment
Site the chiller close to the equipment it is supplying in order
to avoid long pipe runs which may lead to a reduction in
cooling output due to unsuitable ambient conditions. When
selecting the installation site, care should be taken to ensure
easy access at all times; this will make maintenance of the
system easier.
You should also ensure adequate ventilation of the room
where the chiller is sited. If there is inadequate ventilation,
the temperature of the room will increase as a result of waste
heat, leading to impaired performance of the chillers.
Cooling media
Chillers are suitable for cooling water or a water/glycol mix-
ture. When filling the systems for the first time, water from
the existing supply line is generally suitable, although care
should be taken to ensure a consistent water quality.
However, as satisfactory results are only rarely achieved
without water treatment, additives should always be added
to the cooling water, irrespective of the installation site. As
well as protecting against frost, these also serve to impair
bacterial growth and achieve optimum corrosion protection.
Pre-mixed additive is available from Rittal in the mix ratios
 1:2 for outdoor siting
 1:4 for indoor siting, both types are available in 10 l, 25 l
and 200 l containers