SystemAir SyScrew Water EVO CO 1070 /S, Руководство по установке и обслуживанию

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14
4 - Installation (continued)
4.3 Hydraulic connection of the evaporator
The flow switch and the filter water, although not included in the
supply, must always be fitted such as plant components.
Their installation is mandatory for warranty.
WARNING
The external hydraulic circuit must ensure the
water flow to the evaporator under any working
or adjustment conditions.
The circuit shall be composed by the following elements:
Q
A circulation pump which can ensure the necessary capacity
and discharge head.
Q
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 water capacity in the primary piping of the circuit and in the
evaporator is lower than this value, an insulated storage tank
shall be installed.
Q
A membrane expansion vessel provided with safety valve with
vent, that must be visible.
NOTE
The capacity of the expansion vessel must allow
for an expansion of at least 2% of the volume of
the fluid in the circuit (evaporator, piping, user
circuit and standby tank, if any). The expansion
vessel needs not be isolated, because no water
can circulate inside it.
A flow switch will stop the unit when the water is not circulating or a
flow rate problem occurs.
To install the flow switch, follow the manufacturer’s instructions.
As a general rule, the flow switch 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
switch.
Q
The bleed valves must be mounted on the highest point of the
piping.
Q
The stop valves must be mounted on the piping of the water ente-
ring/leaving the evaporator.
Q
The drain points (provided with plugs, cocks etc.) must be arran-
ged in the lowest point of the piping.
WARNING
The flow switch must be connected (terminals
1-2) as shown in the wiring diagram of the
“User’s Terminal Box”.