30
3.4.4 Hydraulic connections
One or more connections, depending upon the model, are located on the upper part of the main casing : these
are at the entry to the water distribution header inside the tower and to these must be connected the piping of
the hot water supply from the installation to be cooled.
For all the
CEHV
models, the water inlet connection is fitted with a free-moving, adjustable flange, so that the
piping-up to the installation can be readily made by means of flanged terminals normally available on the
market.
Precautions to be taken:
-
place the gasket supplied with the unit between the flanged inlet water connection and the supply
water pipe from the installation.
-
It is good practice to insert an expansion joint or a rubber anti-vibration connector between the inlet
water flange and the supply pipe from the installation to compensate for off-axis movements of the
piping.
-
do not allow the water supply line from the installation (generally, made from steel and full of water)
to impose a load upon the flanged connection of the cooling tower, but rather provide a support
framework for that purpose.
-
do not tighten excessively the bolts that join the inlet water flange to the water supply piping from
the installation: since the former is made of plastic, an over-energetic tightening might be cause of
breakage.
If the tower is complete with basin, it is within this that are located the cold water return connections, which are
usually connected to the pump which sends water to the equipment to be cooled; if the installation is provided
with a remote sump placed at a lower level than that of the tower, the return water connections can also drain
freely by gravity into the sump below, but it may be necessary to replace the original connection with another of
greater diameter (or alternatively, add a second connection).
NOTE:
a) if the basin of the tower simply serves as a drainage area and remains almost always empty, i.e. if
there is a remote sump beneath the tower, the float-valve for the make-up of the evaporated water
should be located in the remote sump itself.
In order to avoid water-leakage from the water outlet connection, it is recommended that the rubber gasket be
located externally to the basin, where the smooth surface can guarantee the water-tightness; if the gasket is
positioned on the inside of the basin it will not ensure water-tightness owing to the rough surface.
P For correct installation, follow the indications presented below, taking account of the fact that the side-panel
of the tower will remain fixed between the butyl gasket (2) and the rubber one (3) [Fig. 11].
[Fig. 11]
1
Flange
2
Butyl gasket
3
Fibreglass side-wall
4
Gasket
5
Fixing ring
The drain connection must thus be tightened using a compass wrench (special type of spanner for this
purpose).
In the basin are also located:
-
the overflow and the bottom drain, which must be connected to the drain piping to the sewer.
-
The connection associated with the float-valve, for the automatic make-up of the evaporated and the bleed-
off water.
All the above connections are gas-type threaded (male thread), unless otherwise requested.
Содержание H51369
Страница 4: ...4 2 DESCRIZIONE DELLA MACCHINA Fig 02...
Страница 23: ...23 2 DESCRIPTION OF THE EQUIPMENT Fig 02...
