CLIVET WSHN-EE 101, Installation And Use Manual, Page: 17 / 52

pag 17
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
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,
in both heating and cooling modes. 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.
For heat pump units, a
BY
motorized cut-off valve is also
necessary. During heating, this valve bypasses the pressure
switch valve.
VI SHUT-OFF VALVE
TO REMOVE THE POWER SUPPLY TO THE UNIT
to avoid water consumption:
1. put units in OFF
2. wait that the valve is in closed position
3.
remove the power supply
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.
O - 10V
BY
PS
VI