Chillers – General instructions Assembly and commissioning When siting the chillers, the following points should be observed: Connection of an inlet and outlet duct requires the manu- With chillers that are intended for covered outdoor siting, facturer’s prior consent. the minimum external temperature should be taken from − Performance loss (air-cooled chillers) the technical specifications. Never site the chiller in the vicinity of a heater. In the case of chillers (for water) at temperatures below − Performance loss. 0 °C, a water/glycol mixture should be added in the pre- The chiller may only be sited on flat, solid surfaces. The scribed ratio. maximum permissible deviation from the vertical is 2°. If it is possible to shut off the equipment cycle, a bypass Connect the equipment to the chiller using insulated pipe must be provided in order to protect the pump. or hose connections. Under no circumstances must the circulation pump be If the equipment is positioned higher than the chiller, allowed to run dry. install a non-return valve in the upstream inlet and a mag- − Damage to the pump. netic valve in the return to prevent the tank from overflow- ing. 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 Technical System Catalogue/Climate control 3 - 52
Technical System Catalogue Climate Control
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