Plumbing Connections; Characteristics Of The Circuit Water; Typical Plumbing Diagram - MAXA i-290 0106 Installer Manual

Failure to comply with the rules set out in this manual may result in:
• malfunctions and loss of machine performance;
• leakage of refrigerant gas, with possible formation of an explosion hazard zone;
• damage to components or piping (e.g. freezing).
ATTENTION: All loading/unloading operations of the machine must be carried out by QUALIFIED PERSONNEL (IEC 60335-2-40
Annex HH).
ATTENTION: During loading/unloading operations, there is always a risk of refrigerant gas leakage and thus the formation
of flammable atmospheres. Take the utmost care to ensure that no refrigerant gas is present in the environment before and
during each operation.
5.10 PLUMBING CONNECTIONS
The plumbing connections must be made in accordance with national and/or local regulations; pipes can be made of steel, galvanised steel, mul-
tilayer steel or PVC. Pipes must be accurately sized according to the maximum 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 reused 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 or a dirt separator (installed on the return pipe) with metal mesh no larger than 1 mm.
• Loading group and exhaust valve where necessary.
When sizing the pipes,make sure not to exceed the maximum pressure drop on system side reported in the technical data
table in Chapter 12 (see useful head).
Connect the pipes to their fittings always using the key-to-key method.
Create a suitable drain for the safety valve.
CAUTION: The responsibility to verify that the expansion tank is suitable for the real capacity of the installation lies with the
installer.
CAUTION: Place the return pipe from the system at the 'WATER INPUT' label, otherwise the evaporator may freeze.
CAUTION: It is mandatory to install a metal filter (with mesh no larger than 1 mm) on the return pipe from the system
labelled "WATER INLET". Alternatively, it is possible to install a dirt separator that guarantees a filtration degree of no more
than 1 mm; in this case is not necessary to install the Y-filter.
If the flowmeter is tampered with or altered, or if the metal filter or the dirt separator are not present on the system, the
warranty shall expire. The filter (or the dirt separator) must be kept clean, therefore, after installing the unit, you must make
sure that they are still clean and check them regularly.
CAUTION: All the units leave the company supplied with flowmeter (installed in factory). If the flowmeter 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 meter. Never jumper connections of the flowmeter in the terminal block.
The heating system and the safety valves must comply with the requirements of standard EN 12828.
5.10.1 Characteristics 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:
Electrical conductivity
Total hardness
Temperature
Oxygen content
Max glycol quantity
Phosphates (PO
Manganese (Mn)
Alkalinity (HCO
Chloride ions (Cl
Sulphate ions (SO
Sulphide ions (S)
Ammonium ions (NH
Silica (SiO
It is preferable to use pure water. Do not add more antifreeze than the maximum quantity specified in this manual.
(*)
5.10.2 Typical plumbing diagram
Refer to the "Handbook" for further information regarding possible unit installation configurations.
28
MAXIMUM CHEMICAL-PHYSICAL PROPERTIES ALLOWED FOR THE CIRCUIT WATER
PH
(*)
)
4
Iron (Fe)
)
3
)
-
)
4
)
4
)
2
i-290
Inverter air/water heat pumps with axial fans
7,5 - 9
100 - 500 μS/cm
4,5 – 8,5 dH
˂ 65°C
˂ 0,1 ppm
10 %
˂ 2 ppm
< 0,05 ppm
< 0,3 ppm
70 – 300 ppm
< 50 ppm
< 50 ppm
No one
No one
< 30 ppm