HWA1-A & HWA1-H
Air/Water chillers and heat pumps with axial fans
12
MODELS
A
B
C
D
HWA1-A / HWA1-H 0140
800
800
200
600
HWA1-A / HWA1-H 0147
800
800
200
600
HWA1-A / HWA1-H 0260
800
800
800
600
HWA1-A / HWA1-H 0272
800
800
800
600
HWA1-A / HWA1-H 0285
800
800
800
600
The recommended minimum distance for installation,
maintenance and operation.
N.B.
Avoid suspended installations. If you cannot, use your
common sense and follow local regulations, and in the case of
doubt, contact your authorized service center.
7.4
HYDRAULIC CONNECTIONS
The hydraulic connections have to be installed in accordance with national and/or local regulations; the pipes can be made up of
steel, galvanized steel or PVC. The pipes have to be accurately sized as a function on the nominal water flow of the unit and on the
hydraulic pressure drops of the hydraulic circuit. All the hydraulic connections must be insulated with closed-cell material with a
proper thickness. The chiller should be connected to piping using flexible joints. It’s recommended to install in the hydraulic circuit
the following components:
Hole thermometers for the hydraulic circuit’s temperature control.
Manual gate valves to intercept the unit from the hydraulic circuit.
Y-shaped metallic filter (mounted on the return pipe from the plant circuit) with a metallic mesh not less than 20 openings.
Expansion vessel with adequate capacity to the total water content of the plant.
Anti-vibration joints of adequate diameter to piping in order to prevent vibration transfer to the plant.
Manometer to read the pressure of water in the outlet and then determining the next water flow.
Loading group and discharge valve, where it’s required.
WARNING: Make sure that, when determining the pipe sizes you should exceed the maximum head loss on the plant
side, please refer to the technical data given in the table of Paragraph 13 (see available head pressure).
WARNING: In the models of HWA1-A/HWA1-H series, the integrated expansion vessel is not included on the plant
side. The real capacity of the plant circuit should be verified by the installer for providing an expansion tank with
adequate volume.
WARNING: The return pipe from the plant circuit should be in correspondence with the label: ”WATER INLET”,
otherwise the evaporator may freeze.
WARNING: It is required to install a metallic filter with mesh not larger than 1mm on the return pipe from the plant
circuit with label “WATER INLET”. The warranty will no longer be valid if the water flow switch is altered or changed
or if the metallic filter is not installed. The filter should be kept clean, so make sure that is clean after the installation
of unit, and then check it periodically.
All the units are standard supplied with water a factory-mounted flow switch. Should the water flow switch be
altered, removed, or should the water filter not be installed on the unit, the warranty will no longer be valid. Please
refer to the wiring diagram for the water flow switch electric connections.
The water on the charging/topping up pipe must be opportunely pre-filtered from any suspended particles and
impurities through the use a cartridge filter (washable, wrapped wire, etc.) of at least 100 microns.
Check the water hardness with which you charge and top up the plant circuit. For particularly hard water, it is
necessary to utilize a water softener. For water treatment of the plant circuit, please refer to UNI 8065.
Front panel
