Airwell SWS 1602 HFС 407C [17/82] Installation
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Airwell SWS 1602 HFС 407C [17/82] Installation

Airwell SWS 3202 HFС 134a [17/82] Installation
Page 16
Installation
Before filling the circuit, it is important to
check that it is free from any foreign matter,
sand, gravels, rust, welding deposits, waste
and other materials that may damage the
evaporator.
When cleaning the lines, it is recommended to cre-
ate a circuit by-pass. It is important to mount a filter-
ing medium (30 mesh) upstream of the chiller.
If necessary, the water required to fill the
circuit must be treated to obtain the request-
ed PH.
4.4 Hydraulic connection
of the condenser
The external hydraulic circuit must ensure
the water flow to the condenser under any
working or adjustment conditions.
The cooling of the units is generally ensured by con-
necting the condenser to a cooling tower, though the
units can be cooled also with well water.
In the presence of a water-cooled condenser, it is
necessary to check the flow rate and/or the tempera-
ture of the cooling fluid that flows through the con-
denser, so as to maintain the refrigerant pressure at
values that can ensure a satisfactory operation.
When a cooling tower is used, the simplest regula-
tion methods consist of checking the operation or the
speed of the fan or the air volume, by means of a
damper, once the pilot thermostat has been installed
in the basin of the tower.
Alternatively, or if no water from a cooling tower is
used, you can adopt a recirculaton system provided
with a 3-way valve.
This circuit shall consist of:
I
A circulation pump that can ensure the necessary
capacity and discharge head.
I
A flow meter to turn off the appliance when no wa-
ter is circulating.
The flow meter must be connected in series,
as shown in the wiring diagram of the con-
trol panel.
To install the flow meter, follow the manufacturer’s
instructions.
As a general rule, the flow meter shall be mounted
on a horizontal pipe, at a distance from the curves
equal to 10 times the diameter of the pipe and far
from valves or other components that are likely to
hinder the water flow upstream of or downstream
from the flow meter.
I
The bleed valves must be mounted on the highest
point of the piping.
I
The stop valves must be mounted on the piping of
the water entering/leaving the condenser.
I
The discharge points (provided with plugs, cocks
etc.) must be arranged in the lowest point of the
piping.
Furthermore:
I
Provide the condenser with a by-pass circuit,
equipped with a shutoff valve
I
Insulate piping, to prevent the risk of heat loss.
I
Install a filter on the suction side of the condenser.
I
A three-way valve should be installed on-site. It
permits to bypass the condenser for correct oper-
ation at low return water temperature. The best po-
sition is close to the condenser.
To install the flow meter, follow the diagram illustrat-
ed in paragraph 4.3.
4.5 Hydraulic connection
The water inlet/outlet fittings shall conform to the in-
structions provided by the plates affixed neat the
connection points.
4.6 Power supply
Before carrying out any operations on the
electrical system, make sure that the unit is
deenergised.
It is important that the appliance is ground-
ed.
The company in charge of the installation
shall conform to the standards applicable to
outdoor electrical connections.
Manuale SWS-SWR EN1.qxp 05/11/06 14:18 Pagina 16

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