SOLARFOCUS vampair K 08, Руководство по установке

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6 Hydraulic connection
6.5.3 Heat pump pipe
–
For heating circuit connection from the underside
of the heat pump, we recommend laying the floor in
the ground with the SOLARFOCUS heat pump
pipe
– Art. no. of the heat pump pipe: 141805
The following figure shows the structure of the pipe.
The dimensions are important for placement in the con-
crete foundation
> Fig. 2-48, page 34
6.6 Make-up water requirements
Recommendation: Low salt driving - filling with
demineralised water
, see VDI 2035 sheet 2.
Water-side corrosion
Corrosion is usually triggered by the available oxygen
in the water. This value can be brought into a safe
range with proper planning, design, installation and
maintenance of the heating system. A constant input
of oxygen should be avoided
Important in this regard: Check pressure mainte-
nance at regular intervals (operating pressure of the
heating system, pressure in the expansion tank).
Formation of scaling
Scaling is the formation of firmly adhering deposits on
water-contacting walls of hot water heating systems.
The cause of scaling is the presence of limestone in
the water.
Parameters that play a role in the formation of scaling:
–
System volume (the bigger it is, the less total hard-
ness is permissible, e.g. buffer tank fitted).
–
Total heat output (the bigger it is, the less total hard-
ness is permissible).
To determine the total allowable hardness, the specific
water content must be determined.
Example:
The fill and make-up water should meet the following
guideline values ​​according to VDI 2035 Part 1.
Total heat
output
Specific system volume (VDI 2035)
<20
l/kW
≥20 <50
l/kW
≥50
l/kW
< 50 kW ≤ 16.8°dH ≤ 11.2°dH < 0.1°dH
50 - 200 kW ≤ 11.2°dH ≤ 8.4°dH < 0.1°dH
20 - 600 kW ≤ 8.4°dH < 0.1°dH < 0.1°dH
> 600 kW < 0.1°dH < 0.1°dH < 0.1°dH
In the event of exceeding the above values, ​​the filling
water is to be treated (e.g., ion exchanger resin).
pH value
In the normal case (mixed installation) no measures
are required to influence the pH
(control: value
should be in the range of 8.2 to 9.5).
For the resistance of the materials steel and copper in
heating systems a pH in the alkaline range is favou-
rable.
Exception: If aluminium materials are used in the hea-
ting system, a pH from 8.2 to 8.5 must be maintained
(heavy corrosion of aluminium from pH > 8.5).
If the value is significantly less than < 8.2 after filling,
then perform a check again after 8-12 weeks.
If no increase in pH could be achieved then add 10
g/m³ trisodium phosphate (Na
3
PO
4
) or 5g/m³ sodium
hydroxide (NaOH).
Allow 2 to 4 weeks of operation before further cor-
rections.
20 Installation manual vampair