USER and
MAINTENANCE
MANUAL
21
8.8 OPERATION WITH WATER TO THE CONDENSER AT LOW TEMPERATURE
(HEAT PUMP UNIT)
The standard units are not designed to run with the flow of water to the condenser at too low a
temperature (refer to the technical booklet for the limits)� In order to operate over these limits, the unit
could request structural modifications� In the event of these necessities, contact our company�
8.9 DISCHARGE OF THE SAFETY VALVES
The cooling circuit is equipped with safety valves: some standards prescribe that the drain of such valves
is taken outside via a relevant pipe, which must have a diameter at least equal to that of the valve drain
and its weight must not burden the valve�
If environment temperatures are expected to be less than the freezing
point of water, it is important to use anti-freeze mixtures in the above
mentioned percentages.
In the case of units with pump units applied in plants with a per 30%
glycol, it is necessary to request during the order phase a technical
check to assess the compatibility of the pumps and find the best
solution which could require use of a specific hydraulic module or the
application of pumps with seals and special electric motors.
ELECTRIC CONNECTIONS
9.1 OVERVIEW
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The electrical connections must comply with the information shown on the wiring diagram attached
to the unit and the regulations in force in the place of installation�
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The earth connection is mandatory by law� The installer must connect the earth cable using the rele-
vant PE clamp on the earth bar situated in the electric control board�
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Verify that the power supply voltage corresponds to the nominal data of the unit (voltage, number of
phases, frequency) stated on the plate on the machine�
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The power supply voltage must not undergo variations over ±5% and the unbalance between the
phases must always be less than 2%� If this should not occur, contact our technical dept� in order to
select the relevant protections�
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Check that the line is connected with the correct sequence of the phases�
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To feed in the electrical cables, use the hole in the structural steelwork indicated by the relative label�
The power cord is fed in through the bottom part of the electric control board of the unit�
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The control circuit power supply derives from the power line via a transformer situated in the electric
control board� The control circuit is protected by relevant fuses�
9
Warning: always convey the drain to areas where the jet cannot
cause harm anyone. The intervention/drain of safety valve induces
around the outlet point a hazardous area (Zone 1).
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