Maintenance - Baxi Solarflo Commissioning, Maintenance & Servicing Manual

Solar fluid concentrations
% volume
25
30
35
40
45
50
24 Solarflo - Solar Thermal Domestic Hot Water System
Density at 20°C g/cu.cm
1.023
1.029
1.033
1.037
1.042
1.045
4.0

Maintenance

4.1 Check heat transfer fluid
The heat transfer fluid must be checked every two years
with regard to its antifreeze and pH value.
- Check antifreeze using antifreeze tester.Target value is
approximately -21 deg C (40% concentration).
Do not allow to fall below 30% concentration.
If necessary replace or replenish the solar heat
transfer fluid.
- Check pH value with a pH indicator rod (target value
approx. pH 7.5). If the limit pH value is less than pH 7,
replace the heat transfer fluid.
4.2 Maintenance of the collector
The collector or the collector array must be inspected
visually, once a year, for any damage, leaks and
contamination.
4.3 Cylinder
Refer to manufacturers documentation.
Refractive Index nD20
1.3627
1.3690
1.3747
1.3801
1.3855
1.3910
Frost protection °C
-10
-14
-17
-21
-26
-32