Unical HP_OWER ONE 120R, User'S And Installer'S Manual

Page: 13 / 64

12
CAUTION: when sizing the pipes, make sure not to exceed the maximum pressure drop on plant side reported in the
technical data table in Paragraph 0 (see useful head).
CAUTION: connect the pipes to their fittings always using the key to key method.
CAUTION: The return pipe from the system must be installed near the label “WATER INLET” otherwise the
evaporator could freeze.
CAUTION: It is mandatory to install a metal filter (with mesh no larger than 1 mm) and a dirt separator on the
return pipe from the system labelled “WATER INLET”. If the flow switch is manipulated or altered, or if the metal
filter and dirt separator are missing, the warranty will terminate immediately. The filter and dirt separator must be
kept clean. Therefore after installing the unit, you must make sure that they are still clean and check them
regularly.
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.
6.4.1 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 (PO
4
) ˂ 2ppm
Manganese (Mn) < 0.05 ppm
Iron (Fe) < 0.3 ppm
Alkalinity (HCO
3
) 70 – 300 ppm
Chloride ions (Cl-) < 50 ppm
Sulphate ions (SO
4
) < 50 ppm
Sulphide ions (S) None
Ammonium ions (NH
4
) None
Silica (SiO
2
) < 30 ppm
6.4.2 Condensation discharge system
All HP_OWER ONE units are built in such a way that the base of the unit acts as a condensate drip tray. A plastic fitting is standard
supplied to be connected below the base in the specific slot in order to connect a pipe which channels the condensate.