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7.3 HYDRAULIC AND ELECTRICAL CONNECTIONS
7.3.1 HYDRAULIC CONNECTIONS
When preparing the hydraulic connection, it is compulsory to follow the indications below and to follow the National dispositions.
Do not twist the unit connections. With a key, block the connection and, with another key, fix the
connecter.
Fix the pipes with flexible curves in order to avoid the transmission of vibrations and to compensate the thermal dilatations.
It is recommended to install the following components on the pipes:
- zone valve (if not required as options);
- temperature and pressure indicators for the ordinary maintenance and control of the group. The pressure control allow to
evaluate the correct functioning of the expansion vase and to highlight in advance eventual water losses in the plant;
- interception valves to insulate the unit from the hydraulic circuit in case of maintenance;
- metal filter (incoming pipe) crossed with strict meshes (less than 1 mm) to protect the exchanger from the impurities of the pipes.
This phase is necessary overall for the first starting of the unit;
- escape valves, to place in the higher zones of the hydraulic circuit, in order to allow the purging of air. On the internal pipes there
are manual escape valves for the purging on board; this operation should take place when the tension is off;
- discharge tap and, if necessary, drain tank to allow the empty of the plant during maintenace processes;
- in case of process applications, it is recommended to install an decupling exchanger, in order to avoid the possible dirtying of the
exchangers.
It is fundamental that the water income occurs where signalled by the label “water income”. If not,
the counter-current circuit is not respected and the risk of misfunctioning, blockage or broken-up of
the unit is real.
Dimensions and positioning of the hydraulic connections are indicated on the dimensionals drawings.
The hydraulic circuit should be realized in order to grant a constant water flow (+/-15%) in every
functioning conditions.
7.3.2 DRAIN CONDENSATION CONNECTION
Use a flexible rubber with an internal diameter of 16 mm.
The inclination of the drain pipe should permit the water down flow outside. If not, the bulb
collection will fill up and there will be water loss.
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