Important
Do not use glycol.
The use of glycol in the heating circuit invalidates the warranty.
1. Fill the installation until a pressure of 1.5 to 2 bars is reached. Read
the pressure on the mechanical pressure gauge.
Important
The mechanical pressure gauge, situated under the top panel,
close to the expansion vessel, is only used when filling the indoor
unit with water. After the heat pump is switched on, the pressure
will be shown on the display.
2. Check for any water leaks.
3. Completely vent the indoor module and the installation for optimum
running.
Treatment of the heating water
In many cases, the heat pump and the heating system can be filled with
mains water, without treating the water.
Caution
Do not add any chemical products to the 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 heat pump and damage the heat exchanger.
Important
Flush the installation with at least 3 times the volume of water
contained in the 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.40 Heating water specifications
Specifications
Unit
Total system output
≤ 70 kW
Hydrogen potential (pH)
7.5 - 9
Conductivity at 25°C
μS/cm
10 to 500
Chlorides
mg/litre
≤ 50
Other components
mg/litre
< 1
Total water hardness
°f
7 - 15
°dH
4 - 8.5
mmol/l
0.7 - 1.5
Important
If water treatment proves necessary, Baxi recommends the
following manufacturers:
Cillit
Climalife
Fernox
Permo
Sentinel
Flushing new installations and installations less than 6 months
old
1. Clean the installation with a powerful universal cleaner to eliminate
debris from the system (copper, hemp, flux).
2. Thoroughly flush the installation until the water runs clear and shows
no impurities.
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