9
4 - WATER CONNECTIONS
4.1 PRELIMINARY INFORMATION
CUT-OFF VALVES :
• installed at inlet and outlet allow maintenance
operations without having to empty the system .
THERMOMETERS AND MANOMETERS :
• installed at entry and exit of the main elements
facilitate inspection and maintenance.
AN AIR BLEED VALVE :
• installed in all of the highest points of the system
allowing the venting of the circuits air.
DRAINAGE TAPS :
• installed in the lowest points of the system to allow
bleeding.
EXPANSION TANK :
• It keeps a correct system pressure when the water
temperature changes. It must be dimensioned as a
function of water content. Could be necessary install
in addition on the unit one or more of it
.
WATER FILTER :
• must be installed immediately in the water input of
the unit, in a position that is easily accessible for
cleaning.
• The filter should never be re-moved, this operation
invalidates the guaranty .
• filter features:
4.3 OPERATION SEQUENCE
Before connecting the unit, carefully wash the system by
filling it and emptying it several times with clean water.
In the units equipped with hydraulic pipeworks use the
bypass.
Ignoring this operation will lead to several filter cleaning
interventions and at worst cases can cause damages to
the exchangers and the other parts.
Execute leakage test before isolate the pipes.
To avoid heat dispersions and formation of condensate
isolate all the pipes.
Leave various point of service free (wells, vent-holes
etc )
4.4 WATER QUALITY
4.5 RISK OF FREEZE
4.6 ANTI-FREEZE SOLUTION
Consider that the use of anti-freeze solution determi-
nes an increase in a pressure drop.
Make sure that the glycol type utilized is inhibited (not
corrosive) and compatible with the hydraulic circuit
components (pump etc).
Selection and installation of system components must
be carry out by installer.
Following you will find some indications to integrate
with what is provided by the local regulations in force
and by the good technical laws.
4.2 COMPONENTS
The water quality is determined by the following
factors, avoid therefore:
• Inorganic salts
• pH
• Biological load (seaweeds etc)
• Suspended solids
• Dissolved oxygen
Water with inadequate characteristics can cause:
• pressure drop increase
• energy efficiency decrease
• corrosive symptom increase
If the unit or the relative water connections can be
subject to temperatures close to 0°C adopt measures
for prevent risk of freeze.
For example:
• Mix water with ethylene glycol
• Safeguard the pipes with heating cables placed
under the insulation
• Empty the system in cases of long non-use and
check that:
• there are no closed taps present that could trap
water even after emptying
• there are no low points in which water can
stagnate even after emptying; carry out any
blowing required .
SUPPORTS :
• The hydraulic pipes weight mustn’t burden on the
unit connections ..
FLOW SWITCH
• The flow switch must be present as a component of
the system
Size
31-81 82-102 122-222
Ø 1”
1"
¼
1" ½
filtration mesh (micron)
500μm 600μm 600μm
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