M03Q40G6-03 30/07/08 pag 16
SYSTEM MEASURES ON SOURCE SIDE
FILTER
It is very important for the water to be free of impurities. If it
is not, the efficiency of thermal exchange is diminished. In
worst cases, the exchanger can be irreparably damaged. If
the filter is not present on the machine, it must be
immediately installed upstream from the unit, in a position
which can be easily reached for cleaning
FLOW SWITCH
The flow switch must be present as a component of the
system, so as to ensure shutdown of the unit if water is not
circulating. It must be installed in a straight tract of the
tubes, not near the elbows, which can generate harmful
turbulence
UNFREEZABLE LIQUIDS
If the unit is used when the water temperature is lower than
+ 4°C, avoid the formation of ice by using unfreezable
liquids (ex. Ethilenic Glycol) in the necessary percentage.
The use must also be determined for room temperatures
near 0°C. Its use is also required when geothermal probes
are used.
WASHING THE SYSTEM
Carefully wash the system by using clean water and
discharge it before connecting the unit.
CONTROL OF FLOW RATE
This makes it possible to limit water consumption, increase
energy efficiency and extend the unit's operating limits.
It can be modified by using
1. Modulating motorized valve
2. Cut-off valve
3. Pressure switch valve
MODULATING VALVE PRESSOSTATIC VALVE + BYPASS VALVE
O - 10V
BY
PS
MODULATING MOTORIZED VALVE
This valve makes it possible to modulate the water flow
rate on the source side according to its temperature, thus
extending the operating limits of the unit.
The modulating valve is controlled by the unit's electronic
control.
PRESSURE SWITCH VALVE PS
Allows modulation of the water flow rate based on its
temperature (in summer operation only). It must be
connected to the outlet pipe of the compressor with a
capillary.
VI SHUT-OFF VALVE
VI
CUT-OFF VALVE VI
This allows cut-off of water on the source side whenever
the compressor is not running.
It is therefore advisable for once-through water systems if
there is no modulating valve.
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