Ecodense WT-S DHW 45 H, Инструкция по установке, эксплуатации и обслуживанию, Страница: 10 / 28

04.12.2020 Rev. 00 9
5. WATER QUALITY
1. Before connection of condensing boilers any dirt and residue in circuit must be cleaned.
2. Water Hardness and pH measurements should be made by the authorized or central service in the
field where the boiler will be commissioned before the commissioning, and it should be decided
whether the water can be used in the boiler water installation.
3. Refined water must be used while adding water to heating circuit due to any loss in closed circuit.
4. Permitted water hardness for the water used in water circuit must comply with French or German
(VDI 2035) hardness degree standards. The lime dissolved in water, settles on hot surfaces and
forms an insulation layer when water temperature rises. This prevents heat transfer and high
temperature might damage the heat exchanger. If boiler water cycles through water circuit, all
circuit water must meet above requirements. If a plate heat exchanger separates boiler water and
heating circuit water, only the water between boiler and heat exchanger must meet these
requirements.
In order to prevent sedimentation, properties of the water to be used or to be reinforced in the water line
should not exceed the following table values according to below mentioned capacities.
Boiler Type Capacity
(Total Hardness)
ppm (°F) French VDI German
Single Boiler 0-50 kW
250 < 25 < 14
Single Boiler 50-200 kW
110 < 11 < 6,16
*Volume to capacity ratio of water in circuit must be higher than 20 I/kW. Total volume of first filled
water and additional water must be less than volume of system.
5. The customer or contract company should analyze the water to be used in the water line by an
accredited organization prior to commissioning and a water quality report should provided
containing Minimum Hardness, pH and conductivity values, total dissolved solid values .
6. pH value of unrefined water must be 7<pH<9. This pH value can be achieved after filling the
circuit with main circuit water with pH value of 7 and air separation. pH value of refined
water must be between 7-8,5 pH.
7. In new building installations, periodic preventive maintenance must be carried out by using
organic solutions with a chemical pH effect [neutral].
8. Prior to commissioning of condensing boilers in old building water installations, a suitable type of
organic solution with a pH value (acidic) between 4 and 6 should be washed.
9. The boiler water pipeline and heat exchanger should be treated with a suitable type of organic
solution over a period of 6 to 12 months to prevent calcification and deposits that may occur over
time in the installation.
10. If the water quality is outside the value ranges given above, it is mandatory to use a water
softening filter or electrolytic limescale reducer in the system for water installations.