English
Page 15
Installation
3) Make sure the machine base is resting on the flat
washer (pos. E) of the jack. To offset any levelling
problems, adjust the top nut (pos.D) using an
adeguate spanner. Lock in position with grower
washer (pos.F) and low nut (pos.C).
At the end of this operation, make sure the machine
is elastic on the axes and compensating antivibra-
tion joints can be fitted in the water connections.
4.3 External hydraulic circuit
The external hydraulic circuit must ensure
the water flow to the evaporator under any
working or adjustment conditions.
The external hydraulic circuit should consist of the fol-
lowing elements:
h
A circulation pump that can ensure the necessary
capacity and discharge head.
h
The capacity of the primary hydraulic circuit
should not be less than 7.5 litres/KW of cooling
capacity, in order to prevent the repeated start-up
of the compressor and any damage to it. If the wa-
ter capacity in the primary piping of the circuit
and in the evaporator is lower than this value, an
insulated storage tank shall be installed.
h
A membrane expansion vessel provided with safe-
ty valve with vent, that must be visible.
The capacity of the expansion vessel must
allow for an expansion of at least 2% of the
volume of the fluid in the circuit (evapora-
tor, piping, user circuit and standby tank, if
any). The expansion vessel needs not be
isolated, because no water can circulate in-
side it.
h
A flow meter, to disable the appliance when the
water is not circulating.
The flow meter must be connected (termi-
nals 1-2) as shown in the wiring diagram of
the “User’s Terminal Box” (Paragraph 4.7).
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.
h
The bleed valves must be mounted on the highest
point of the piping.
h
The stop valves must be mounted on the piping of
the water entering/leaving the condenser.
h
The discharge points (provided with plugs, cocks
etc.) must be arranged in the lowest point of the
piping.
Manuale SLS-SLH1 2.8.2005 12:34 Pagina 15
