Plumbing And Electrical Connections; Plumbing Connection; Hydraulic Connection; Recommended Water Circuit - Galletti MPE series Installation, Use And Maintenance Manual

MPE
3

PLUMBING AND ELECTRICAL CONNECTIONS

3.1

PLUMBING CONNECTION

All the units belonging to the MPE series are equipped with water differential pressure switch, safety valve, water pressure gauge and automatic filling device
and emptying tap.
Furthermore, depending on the version, MPE units can be supplied complete with pump, expansion vessel and buffer tank:
3.1.1

HYDRAULIC CONNECTION

Warning While connecting the taps, hold the unit's plumbing connections tightly in place using a hexagonal wrench 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;
- standard mechanical filter (FM) (OBLIGATORY!) on the pipe feeding the unit, in proximity to the latter;
- standard mechanical filter (FM) (OBLIGATORY!) and 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.
Important! During wintertime the water circuit (or the water chiller only) must be emptied to prevent damage caused by freezing; 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.
24
Percentage by weight
of ethylene glycol (%)
0
10
15
20
30
All copying, even partial, of this manual is strictly forbidden
Mixture freezing
temperature (°C)
0
-4
-8
-14
-18
RG66007169 - Rev 00