HWMC
22
All copying, even partial, of this manual is strictly forbidden
RG66008809 - Rev 00
3
WATER AND ELECTRICAL CONNECTIONS
3.1 WATER
CONNECTION
All units belonging to the
HWMC
series are equipped with water differential
pressure switch, safety valve, water differential pressure switch, safety valve,
water pressure gauge, automatic vent valve and drainage valve.
According to the specific configuration they can be equipped with pump,
expansion tank and buffer tank.
3.1.1 WATER
CONNECTIONS
Warning
While connecting the taps, hold the unit's plumbing
connections tightly in place using a hexagonal wrench or make sure
that they do not rotate to prevent the pipes inside the unit from being
damaged (see figure).
3.1.2
RECOMMENDED WATER CIRCUIT
Warning!
when making the plumbing connections, make sure there
are no open flames in proximity to or inside the unit.
When setting up the water circuit, it is advisable to equip it with:
- valves for regulating (
VI
) the unit on the water pipes, immediately upstream
and downstream from the unit itself, to be used in the event maintenance
work is required;
- a mechanical filter supplied as standard (
FM
) (
MANDATORY!
) on the
pipes feeding the unit, in proximity to the latter;
- a mechanical filter supplied as standard (
FM
) (
MANDATORY!
) and a
check valve (
VNR
), on the supply line upstream from the filling tap (
RC
);
- an air vent valve at the highest point of the circuit;
- escape pipe for the safety valve (
VS
), which, in the event the safety valve
opens, diverts the jet of water to an area where it cannot harm persons
or damage property (
Important!
);
- vibration-damping couplings (
GA
) on the pipes to prevent vibrations from
being transmitted toward the system.
Important!
It is advisable to ensure that the pipes connected upstream
and downstream from the unit are not smaller in diameter than the
plumbing connections of the unit itself.
Percentage by weight of
ethylene glycol (%)
Mixture freezing temperature
(°C)
0
0
10
-4
15
-8
20
-14
30
-18
Important!
During wintertime periods of quiescence the water circuit must
be emptied to prevent damages caused by freezing; in alternatively, the
circuit may be filled with a mixture of water and glycol; the percentage
of glycol necessary will depend on the lowest forecast temperature
(see table):
Important!
If different antifreeze product is to be used, please contact
the manufacturer.
Failure to install filters
and vibration dampers may cause problems of clogging,
breakages and noise, for which the manufacturer may not be held liable.
