Viessmann AWO-M-AC 101.A06, Assembly And Servicing Instructions

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19
6020930
DHW
probe
secondary
pump
of fancoil
from
fancoil
to radiant panel
from water supply
to DHW fixtures
All of the units leave the company supplied with flow switch (installed in factory). If the flow
switch is altered or removed or if the water filter and dirt separator are missing from the unit,
the guarantee will be void. Refer to the wiring diagram attached to the unit to connect the flow
switch.
The heating system and the safety valves must comply with the requirements of standard EN
12828.
5.6.1 Features of the circuit water
To guarantee correct operation of the unit, the water must be appropriately filtered (see the instructions at
the start of this paragraph) and there must be only a minimum amount of dissolved substances. The
maximum allowed values are shown below
MAXIMUM CHEMICAL-PHYSICAL PROPERTIES ALLOWED FOR THE CIRCUIT
WATER
PH 7.5 - 9
Electrical conductivity 100 - 500 μS/cm
Total hardness 4.5 – 8.5 dH
Temperature ˂ 65°C
Oxygen content < 0.1 ppm
Max glycol quantity 40 %
Phosphates (PO4) ˂ 2ppm
Manganese (Mn) < 0.05 ppm
Iron (Fe) < 0.3 ppm
Alkalinity (HCO3) 70 – 300 ppm
Chloride ions (Cl-) < 50 ppm
Sulphate ions (SO4) < 50 ppm
Sulphide ions (S) None
Ammonium ions (NH4) None
Silica (SiO2) < 30 ppm
5.6.2 Typical plumbing diagram
A recommended connection diagram is shown below.