Trane Picco R32-140, User& Installer'S Manual

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Picco R32
Inverter air/water heat pumps with axial fan
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The heating system and the safety valves must comply with the requirements of standard EN 12828.
The unit is pre-tensioned on the side cover plate in order to provide a suitable passage for the discharge of the safety valve (the installation of
which is the responsibility of the user).
A
5.8.1 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
5.8.2 Hydraulic diagram inside the unit
The hydraulic connection diagrams to the unit for all the available versions and the legend valid for all the diagrams are shown below. In any case,
each unit always includes a safety valve with an opening pressure of 6 bar, whatever the hydronic kit with which it is equipped.
Legend
EV/CO Plate heat exchanger WF Y-filter*
DV Discharge valve FC Flow switch
RV Safety valve W-IN Water input
BV Shut-off valve W-OUT Water output
HKA1 Heat exchanger resistance * VSI 3-way valve *
HKA2 Pump resistance * CV Non-return valve
HKA3 Tank antifreeze heater * P Pump *
VA Expansion vessel AV Automatic air vent valve
* Optional TK Tank *
_ _ _ Separately supplied accessory to be installed outside the unit