Giona 120 Serie Installation, Gebrauch Und Wartung Seite 8

UK
It is advisable to place the appliance near the main hot water drawing point in order to avoid heat
loss along the piping, and possibly near a drain to facilitate emptying operations.
Description of diagram 2:

(A) Safety valve (not supplied)

(B) Emptying cock (not supplied)

(C) Drain pipe (not supplied)

(D) Expansion vessel (not supplied)

(E) Pressure reducer (not supplied)

(F) Non return valve (not supplied)

(G) Stop cock (not supplied)

(H) Pump (not supplied)

( I ) Boiler (not supplied)
It is compulsory to install a safety valve upstream of the boiler.
The pipe connection between the boiler and the safety valve must not be interrupted, in order to
prevent damage to the boiler due to overpressure.
While installing the safety valve, (fig. 2 pos. A) pay attention not to tamper with the valve or to
press it at end stroke. The valve has a nominal set value of 8 bar.
A dripping from the safety valve is normal during the heating phase; for this reason it is advisable
to connect it to a siphon drain.
If the mains pressure is near the valve set pressure, it is necessary to install an adequate pressure
reducer (Fig. 2 pos. E) as far from the appliance as possible.
In case a pressure reducer or a check valve is installed, an expansion tank with capacity no less
than 5% of the nominal capacity of each heating unit (Fig. 2 pos. D) must be installed.
Do not install any check valve between the safety valve and the expansion vessel.
It is nevertheless always recommended to install an expansion vessel with the above mentioned
characteristics in order to protect the appliance and the piping network.
Inflate the membrane chamber of the expansion vessel according to the manufacturer instructions.
Before connecting the unit it is necessary to fill it completely in the following way:

open the inlet cock

open a hot water tap (e.g. bath, sink, etc.) to allow the discharge of air inside; the
appliance is full when water flows freely from the hot water taps;

check for any leaks in the various plumbing connections;
In the presence of water with a hardness value >20°TH (where 1°TH=degree French=10mg
CaCo3/l) a water softener must be installed to prevent an excess of lime scale.
7