i-32V5
Air/water inverter heat pumps with axial fansi
19
5.7
PLUMBING CONNECTIONS
The plumbing connections must be made in accordance with national and/or local regulations; pipes can be made of steel, galvanised steel or
PVC. Pipes must be accurately sized according to the nominal water flow rate of the unit and the pressure drops of the water circuit. All pipes
must be insulated with closed-cell material of adequate thickness. The chiller must be connected to the pipes using new flexible joints, not re-
used ones. The water circuit should include the following components:
•
Well thermometers to monitor the circuit’s temperature.
•
Manual gate valves to isolate the chiller from the water circuit.
•
Metal Y filter and dirt separator (installed on the return pipe) with metal mesh no larger than 1 mm.
•
Loading group and exhaust valve where necessary.
CAUTION: When sizing the pipes,make sure not to exceed the maximm pressure drop on plant side reported in the technical
data table (see useful head).
CAUTION: connect the pipes to their fittings always using the key-to-key method.
CAUTION: create a suitable drain for safety valve.
CAUTION: the installer has to verify if the expansion tank fits with the real capacity of the installation.
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 separa
-
tor 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. Never jumper connections of the flow switch in the terminal block.
The heating system and the safety valves must comply with the requirements of standard EN 12828.
5.7.1 Features of the circuit water
To guaratee 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)
No one
Ammonium ions (NH4)
No one
Silica (SiO2)
< 30 ppm
5.7.2 Typical plumbing diagram
A recommended connection diagram is shown bellow.
