evoheat Evo Control 8, Installation & Operation Manual, Page: 11 / 20

5-Hydraulic connections
9
5.2 CONNECTION OF THE CHILLED WATER LOOP
Check, before connecting the unit, that the installation is leak free and clean.
Install, manually controlled isolating valves (not provided) with a diameter
corresponding to the diameter of the main pipework on the Water Inlet and Outlet
connection of the unit without needing to the drain installation.
It is also recommended to install valves of the water supply lines and on the return
of
each terminal treatment unit so to allow work on each appliance without affecting
other parts of the installation. These valves allow also to adjust the flow arriving at
each terminal units.
It is important to verify that the pressure in the water supply network is adequate to
fill the installation.
5.3 DRAINING
Units are equipped with couplings to fill and drain the hydraulic circuit according to
standards in force.
The water should come from a distribution network, either to the unit directly, or to
any other point on the circuit linking the terminal units together.
5.4 TERMINAL INSULATION
In order to proper keep power consumption lox and to comply with standards in
force, all chilled water pipes must be insulated.
For appropriate insulation with a conductivity of 0,04 W/m
°
K a radial thickness of
25 to 30 mm is required.
5.5 STARTING OPERATION
The installation being finished, the water circuit should be filled, until the service
pressure is reached which should not exceed 2,5 bar .
Check that the air purge valves are open .
Air in the circuit should be completely expelled for proper operation.
Once the hydraulic circuit is correctly filled, the filling valve should be closed.
5-Hydraulic connections
10
WARNING !
It is not the manufacturer
'
s policy to issue recommendations relating to water
treatment. The user or the owner is responsible for contacting a specialised
water treatment enterprise. However, water treatment is a very critical subject and
special consideration should be given to it to ensure that water treatment is properly
carried out to avoid problems linking to fluid circulation. A clogged hydraulic circuit
will systematically lead to premature wear in the machine
’
s components.
WARNING !
Take care not to damage the hydraulic connections by over-tightening. A second
wrench is required to compensate for tightening torque.
The use of a counter wrench is necessary for tightening the valves.
5.6 SAFETY DIFFERENTIAL PRESSOSTAT
A safety differential pressostat is fitted as standard on the water inlet pipe into the
evaporator in order to ensure adequate water flow to the evaporator before starting
the unit.
It acts both in the event of partial blockage (starting to take in ice) and in the event of
a drop in water flow due to pump failure. This is the machine's main protection
device.
5.7 HYDRAULIC MODULE
The hydraulic module requires no special maintenance. Fitting a mesh filter
(accessory) on the unit inlet is strongly advised (refer to 5.1)
Comment: Ensure that all of the various components are protected against freezing
caused by the outside temperature. In the event of any accidental power
failure,ensure that account is taken of ice protection requirements.
WARNING !
In all air conditioning installations with chilled water distribution, the entire network
must be dimensioned to provide a volume of 15 litres per kW of installed capacity.