'操作说明 Hotflow THREE_26_zh.pdf - 第471页

1. FOR YOUR SAFETY ENGLISH T ranslation of the original 14 451820.66.03_EN 2020-05-05 1.10.3 Guideline values for water glycol mixtures Only the monoethylene glycol approved by the manufacturer must be used. Pre-mixed wa…

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Translation of the original ENGLISH 1. FOR YOUR SAFETY
451820.66.03_EN
2020-05-05
13
1.10 General requirements for the coolant
1.10.1 General
To minimise the probability of corrosion damage, algae and sludge formation in the coolant circuit,
the physical and chemical properties of the coolant must be considered during planning,
commissioning and operation. We recommend that the quality of the coolant be checked in
accordance with the specifications of chapter 12 "Maintenance" as a minimum.
The cycles should be determined by the operator based on the environmental and operating
conditions. The existing guideline values are based on empirical values and notes for assessing the
probability of corrosion as set out in EN 12502. Due to the complex interactions between the
materials used and the medium, as well as the different physical and chemical boundary conditions,
universally valid standards cannot be drawn up.
Evaporation on the system water surface can result in thickening of the system water. Raw water
values that are still below guide levels can exceed these levels as a result of this thickening. We
therefore recommend that the water quality be checked on a regular basis and that the water be
replaced if necessary to eliminate the thickening and realign the water values with the basic
conditions.
1.10.2 Guideline values for water quality
Generally speaking, the guideline values for drinking water quality in the EU are met. If necessary,
the water quality should be measured according to EN 50930-6.
The coolant should not contain any organic, settleable or abrasive materials. The use of surface
water or saline water is not permissible.
Corrosion resistance depends primarily on the formation of a protective, stable and adhesive
surface layer. The relevant parameters for developing and maintaining the protective layer are the
pH value and the hydrogen carbonate and sulphate content ratio.
A detailed overview of the water quality requirements can be requested from Glen Dimplex
Deutschland GmbH.
1. FOR YOUR SAFETY ENGLISH Translation of the original
14
451820.66.03_EN
2020-05-05
1.10.3 Guideline values for water glycol mixtures
Only the monoethylene glycol approved by the manufacturer must be used. Pre-mixed water-glycol
mixtures can be ordered from the manufacturer.
To avoid corrosion in the coolant circuit, a concentration of 20 vol % Glykosol N and Antifrogen N
must be maintained.
The quality of the water-glycol mixture must be checked at least once per year. In addition, each
time the medium is supplemented, the composition must be checked using a suitable measuring
device.
Applications with other glycoles and mixture ratios as coolant must be agreed with the manufacturer
before use or at the development stage of the refrigerating system.
1.10.4 Guideline values for demineralised water
The properties of demineralised water, also referred to as desalinated water or deionised water, are
described in DIN 43530.
Demineralised water can lead to copper corrosion in the coolant circuit. This affects components
and pipework made of copper or with a copper content.
To avoid corrosion, no components which release sulphur compounds or zinc must be used
in the external coolant circuit.
Differing coolant regulations and requirements on the part of the application must be taken
into account.
A detailed overview of the water quality requirements can be requested from Glen Dimplex
Deutschland GmbH.
Translation of the original ENGLISH 1. FOR YOUR SAFETY
451820.66.03_EN
2020-05-05
15
1.11 Residual energy and residual risks
1.11.1 Residual energy
Even if all safety notes are observed, the following residual energy can still present a hazard:
• Rotational energy of the fan
• Hot surfaces on machine parts
• Electrical voltage in the control cabinet despite a deactivated main switch
• Refrigerant circuit under pressure
1.11.2 Residual risks
Electrical/mechanical
No risk exists if all safety regulations are observed.
1.12 Notes on minimizing noise and vibrations
Noise
Noise pollution due to airborne noise emissions can be minimised as follows:
• Select an installation location that is not in the vicinity of workplaces and do not direct
the air intake/outlet side towards a workplace.
Vibration
The vibrations caused by the compressor are largely decoupled by the frame.
To further reduce the effect of vibrations, optional vibration-damping levelling feet can be fitted to the
cooling unit.
(See chapter 15.8 "Accessories")