5 Before installation
5.1 Installation regulations
Warning
The boiler must be installed by a qualified installer in accordance
with local and national regulations.
5.2
Installation requirements
5.2.1 Water treatment
In many cases, the boiler and the heating system can be filled with mains
water, without treating the water.
Caution
Do not add any chemical products to the central heating water
without first consulting a water treatment specialist. For example:
antifreeze, water softeners, products to increase or reduce the pH
value, chemical additives and/or inhibitors. These may cause
faults in the boiler and damage the heat exchanger.
Important
Flush the installation with at least 3 times the volume of water
contained in the central heating system.
Flush the DHW circuit with at least 20 times its volume of water.
The water in the installation must comply with following characteristics:
Tab.12 Heating water specifications
Specification Unit
Total output of the installation (kW)
≤ 70 70 - 200 200 - 550 > 550
Degree of acidity
(untreated water)
pH 7.5 - 9.5 7.5 - 9.5 7.5 - 9.5 7.5 - 9.5
Degree of acidity
(treated water)
pH 7.5 - 9.5 7.5 - 9.5 7.5 - 9.5 7.5 - 9.5
Conductivity at
25°C
μS/cm ≤ 800 ≤ 800 ≤ 800 ≤ 800
Chlorides mg/litre ≤ 50 ≤ 50 ≤ 50 ≤ 50
Other components mg/litre < 1 < 1 < 1 < 1
Total water hard
ness
(1)
°f 1 - 35 1 - 20 1 - 15 1 - 5
°dH 0.5 - 20.0 0.5 - 11.2 0.5 - 8.4 0.5 - 2.8
mmol/litre 0.1 - 3.5 0.1 - 2.0 0.1 - 1.5 0.1 - 0.5
(1) For installations with constant heating and a maximum total system output of 200 kW, the appropriate maximum total water hardness is
8.4°dH (1.5 mmol/l, 15°f). For installations of more than 200 kW, the appropriate maximum total hardness is 2.8°dH (0.5 mmol/l, 5°f).
Important
If water treatment is necessary, Baxi recommends the following
manufacturers:
Sotin
Fernox
Sentinel
5.2.2 Gas supply
Before mounting, check that the gas meter has sufficient capacity (in
m
3
/h). To do this, you should bear in mind the consumption of all
appliances. If the capacity of the gas meter is too low, inform the gas
supply company.
5 Before installation
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