Unical HP OWER ONE 70, User'S And Installer'S Manual

Page: 9 / 44

9
V4 14 e 14T HP_OWER
ONE 140
1500 500 400 400 500
V4 16 e 16T HP_OWER
ONE 160
1500 500 400 400 500
CAUTION: It is obligatory to install the unit on a firm and appropriate basement to support its weight. Considering
the weight of the unit, possible vibrations and resultant noise, we do not recommend suspension installion of the
unit; in this case, the firm is not responsible for any damage or inconvenience that may result.
5.4 HYDRAULIC CONNECTIONS
The hydraulic connections have to be installed in accordance with national and local regulations; pipes can be made up of steel,
galvanized steel or PVC. Pipes have to be designed depending on the nominal water flow and on the hydraulic pressure drops of
the system. All pipes have to be insulated with closed-cell material of adequate thickness. Chillers have to be connected to piping
by means of flexible joints. Piping should include:
• Hole thermometers to monitor the system’s temperature.
• Manual gate valves to separate the chiller from the hydraulic circuit.
• Y-shaped metallic filter and a dirt separator (to be mounted on the inlet pipe) with a mesh not larger than 1mm.
• Charging group and discharge valve, where necessary.
WARNING: Make sure that, when designing the pipe length and diameter, do not exceed the maximum head loss
on the plant side, please see the technical data given in the table of Paragraph 12 (available pressure head).
WARNING: Connect the pipes to the attacks by using always key against key system.
WARNING: The expansion vessel have a limited volume. The installator have to provide a further expansion vessel
if it is necessary.
WARNING: Unit water inlet pipe have to be in correspondence with the connection labelled: ”WATER INLET”,
otherwise the evaporator may freeze.
WARNING: It is compulsory to install on the WATER INLET connection a metallic filter (with a mesh not larger than
1mm) and a dirt separator. the warranty will no longer be valid If the water flow switch was manipulated or
altered or if the metallic filter and/or dirt separator were not installed. The filter and the dirt separator have to be
kept clean, therefore make sure that are clean after the unit installing the unit, and then check them periodically.
All units are standard supplied with the water flow switch (factory installed). The warranty will be invalidated if the
water flow switch was altered, removed, or if the water filter and the dirt separator were not installed on the unit.
Please refer to the wiring diagram for the water flow switch electric connections.
Make sur that the heating system and the safety valves must comply with the requirements of EN 12828.
5.4.1 Characteristics of Water of the plant circuit
To ensure the correct operation of the unit, the water should be adequately filtred (see what is reported at the beginning of this
paragraph) and that the amounts of dissolved substances should minimal. The maximum permitted values are given here below.
MAXIMUM PHYSICAL AND CHEMICAL CHARACTERISTICS ALLOWED BY THE WATER OF THE PLANT CIRCUIT
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
Maximum glycol content 50 %
Phosphates (PO4) ˂ 2ppm
Manganese (Mn) < 0,05 ppm