Features Of The Circuit Water; Hydraulic Diagram Inside The Unit - Trane Picco R32-140 User& Installer's Manual

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).
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.
Electrical conductivity
Total hardness
Temperature
Oxygen content
Max glycol quantity
Phosphates (PO4)
Manganese (Mn)
Alkalinity (HCO3)
Chloride ions (Cl-)
Sulphate ions (SO4)
Sulphide ions (S)
Ammonium ions (NH4)
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.
EV/CO
DV
RV
BV
HKA1
HKA2
HKA3
VA
*
_ _ _
18
MAXIMUM CHEMICAL-PHYSICAL PROPERTIES ALLOWED FOR THE CIRCUIT WATER
PH
Iron (Fe)
Silica (SiO2)
Plate heat exchanger
Discharge valve
Safety valve
Shut-off valve
Heat exchanger resistance *
Pump resistance *
Tank antifreeze heater *
Expansion vessel
Optional
Separately supplied accessory to be installed outside the unit
Picco R32
A
Legend
WF
FC
W-IN
W-OUT
VSI
CV
P
AV Automatic air vent valve
TK
Inverter air/water heat pumps with axial fan
7,5 - 9
100 - 500 μS/cm
4,5 – 8,5 dH
˂ 65°C
˂ 0,1 ppm
40 %
˂ 2ppm
< 0,05 ppm
< 0,3 ppm
70 – 300 ppm
< 50 ppm
< 50 ppm
None
None
< 30 ppm
Y-filter*
Flow switch
Water input
Water output
3-way valve *
Non-return valve
Pump *
Tank *