M03I40M7-03 15/11/07 page 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
the worst cases, the exchanger can be irreparably
damaged. The filter, if not present on-board the machine,
must be installed immediately upstream from the unit, in a
position that is easily accessible for cleaning
FLOW SWITCH
Since it is a system component, it must always be included,
in order to ensure unit shutdown in the event of failure of
water circulation. It is to be installed in a straight section of
the pipes, and not near curves which generate harmful
turbulence.
ANTI-FREEZE SOLUTIONS
For use of the unit with ambient temperatures near 0°C,
use antifreeze solutions such as ethylene glycol to prevent
the formation of ice. Its use is also required when
geothermal probes are used.
SYSTEM WASHING
Before connecting the unit, carefully wash the system by
filling it and emptying it several times with clean water.
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
CUT-OFF VALVE
This allows cut-off of water on the source side whenever
the compressor is not running.
It is therefore advisable for systems with disposable water,
if there is no modulating valve
8
BY
PR
C1
8
BY
PR
C2
BT3-BT4 TEMPERATURE PROBES OF WDHH UNIT
These probes, with respective connection, are supplied with
the unit and they must be fitted as specified in the drawing.
CIRC 1 CONDENS.
CIRC 2 CONDENS.
SLEEVE 1/2” (not supplied)
NTC TEMPERATURE PROBE
OF IP67 TIN
PROBE FIXATION NUT
Scrolling CONNECTION 6mm 1/2” in brass
and sealed O-RING
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