5
HYDRAULIC INSTALLATION
20
CHEMICAL AND PHYSICAL PARAMETERS OF WATER IN HEATING/COOLING SYSTEMS
PARAMETER
UNIT OF MEASUREMENT
ALLOWABLE RANGE
HARMFUL SUBSTANCES
Free chlorine
mg/l
< 0,2
(3)
Fluorides
mg/l
< 1
Sulphides
ABSENT
1 with aluminium or light alloys radiators, pH must also be lower than 8 (in compliance with applicable rules)
2 value referred to the maximum water temperature of 80 °C
3 in compliance with applicable rules
Water quality can be measured through parameters like acidity, hardness, conductivity, chlorides content, chlorine content, iron
content and the like.
The presence of free chlorine in the water, in particular, can jeopardize parts of the installation and Robur units. Therefore,
please make sure that free chlorine content and total hardness are compliant with the allowable ranges reported in Table
5.1
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19.
The way the installation is operated can be the cause of possible degradation of water quality.
Moreover, abnormally massive water top-up or reintegration can cause a drift of chemical or physical above-mentioned parameters.
Reintegration should not exceed 5% per year of the total amount of water. It is advised to check regularly the water quality, especially
in case of automatic or periodic top-up.
In case water treatment is needed, this operation should be carried out by a professional or competent person, following strictly the
instructions by the manufacturer or supplier of the chemical substances for the treatment, since dangers could arise for health, for
the environment and for Robur appliances.
Several products for water treatment are available on the market.
Robur does not perform detailed market surveys. Therefore Robur suggests to contact Companies which are specialized in water
treatments. They will be able to suggest the best way how to proceed according to the type of installation.
In case washing of the pipes is needed, this operation should be carried out by a professional or competent person, following strictly
the instructions by the manufacturer or supplier of the chemical substances for the washing, avoiding the use of substances aggres-
sive for stainless steel or containing/releasing free chlorine.
Please make sure the pipes are properly rinsed in order to remove any residue of chemical substances from the pipes.
Robur is not liable for ensuring that water quality is always compliant with what reported in Table 5.1
→
19. Non-compliance with
indications above may jeopardize the proper operation, integrity and reliability of Robur appliances, invalidating the warranty.
For any further detail, please contact directly Robur S.p.A. (tel.+39 035.888.111).
The components described below, to be fitted in proximity to the appliance, are illustrated in the typical hydraulic plant schemes in
Figures 5.2
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22 and 5.3
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23.
▶
VIBRATION DAMPING COUPLINGS
▶
PRESSURE GAUGES (range 0-3 bar).
▶
FLOW REGULATION VALVE (shutter or balancing).
▶
WATER FILTER with mesh MIN 0.7 mm and MAX 1 mm.
▶
BALL CHECK VALVE (also to be fitted on the gas supply line).
▶
EXPANSION TANK on system common circuit or each individual appliance:
the appliance is equipped with its own expansion tank on the machine’s internal circuit. the system circuit thus requires a
separate expansion tank, sized in relation to the maximum heat range and the maximum operating pressure of the water in
the plant (see the figures for reference mentioned above).
▶
WATER CIRCULATOR on system common circuit or each individual appliance: chosen to meet the system specifications.
▶
INERTIAL TANK (OPTIONAL) or accumulator tank:
By the nature of its operating characteristics, the appliance does not strictly require the installation of an inertial tank on the
hydraulic plant. The use of an inertial tank is, however, recommended in order to compensate for sudden variations in load,
in particular when the plant has a water content of less than 70 litres per appliance.
▶
ACCCUMULATOR BOILER (OPTIONAL) for hot sanitary water (ACS):
The appliance does not itself produce hot water for sanitary (domestic) applications). If it is to be used for this purpose, a
remote accumulator tank must be provided. In this case, any use of glycol in the heating circuit must be FOODSAFE.
▶
Systems for BLEEDING AIR from the pipes.
▶
DRAIN COCK (usually dia. ½”) for system water.
▶
PLANT FILLING SYSTEM:
if
automatici
filling systems are used, it is advisable to carry out a seasonal check of the percentage of monoethylene glycol
contained in the plant (if present).
Antifreeze
