Mixing Valve; Commissioning (Ignition); Commissioning The Internal Unit; Gas System Start-Up - Immergas SUPER TRIO Instruction Booklet

1.27

MIXING VALVE.

The Internal Unit is equipped with a mixing valve that regulates
the storage tank unit / cylinder outlet temperature.
Changing the mixing valve adjustment, changes the operation
mode of the system.
- allows adjusting the outlet temperature of the domestic hot water.
By adjusting the mixing valve to a lower temperature than the one
set on the Internal Unit, the same may ignite even if the temper-
ature of the storage tank unit / cylinder water is sufficiently hot
(recommended setting), thus increasing energy consumption.
To avoid unnecessary Internal Unit ignitions, it is also possible
to adjust the mixing valve to the maximum (4 = 60°C).
Setting of the above-described mixing valve allows to obtain a hot
water temperature value at withdrawal between the maximum set
on the mixer and the minimum set on the remote panel.
Mixing valve adjustment field
(indicative values)
1
2
3
4
f the mixing valve is adjusted to a lower temperature than the
storage tank unit / cylinder, it is possible that the hot water tem-
perature required for withdrawal is not obtained.
1.28

COMMISSIONING (IGNITION).

To commission the pack (the operations listed below must only be
performed by qualified personnel and in the presence of staff only):
- make sure the safety devices are included and are operating
properly, particularly:
- safety valve (8 bar)
- expansion vessel
- thermostatic mixing valve
- check that there are no leaks in the hydraulic circuit;
- check connection to a 230V-50Hz power mains, correct L-N polarity
and the earthing connection;
- switch the system on and ensure correct ignition;
- check the intervention of the main switch located upstream from
the system;
- check that all the requirements relating to the Internal Unit and
the central heating circuit have been complied with, as described
in the relative Internal Unit instruction booklet.
Even if just one single safety check provides a negative result, do
not commission the system.
Hydronic unit safety valve.
There is a safety valve present on the hydronic unit that protects
the system from an excessive increase in pressure. This valve in-
tervenes by discharging the liquid contained in the circuit when
the pressure reaches 8 bar.
If the safety valve intervenes and therefore part of the liquid con-
tained in the circuit is lost, it must be re-integrated.
122
~42 °C
~48 °c
~54 °C (default value )
~60 °C
1.29

COMMISSIONING THE INTERNAL UNIT.

See operation and maintenance manual of the Internal Unit.
1.30

GAS SYSTEM START-UP.

To start up the system, refer to the technical standard in force. This
divides the systems and therefore the start-up operations into three
categories: new systems, modified systems, re-activated systems.
In particular, for new gas systems:
- open windows and doors;
- avoid presence of sparks or naked flames;
- bleed all air from the pipelines;
- check that the internal system is properly sealed according to
the technical regulations in force.
1.31

COMMISSIONING SOLAR HEATING SYSTEM

COUPLING KIT (OPTIONAL).

Preliminary checks on the solar system.
Before filling the hydraulic circuit and starting the system, carry
out the following checks:
- ensure that the declaration of conformity of installation of the
solar system is supplied with the appliance;
- make sure the safety devices are included and are operating
properly, particularly:
- safety valve (6 bar)
- expansion vessel
- thermostatic mixing valve (present in the kit)
- check that there are no leaks in the hydraulic circuit;
- make sure the air vent valve is positioned in the highest point of
the circuit above the manifold and that it is operational.
- check the kit connection to a 230V-50Hz power mains, correct
L-N polarity and the earthing connection;
- check that all the requirements relating to the system and the
central heating circuit have been complied with, as described in
the relative Internal Unit instruction booklet.
Even if just one single safety check provides a negative result, do
not commission the system.
Expansion vessel factory-set pressure of the solar circuit hy-
draulic unit.
To compensate the high temperatures that can be reached by the
liquid in the circuit and therefore cause it to dilate, an expansion
vessel has been set up on the hydronic kit with a suitable capacity
to perform this task.
The expansion vessels are supplied pre-loaded at 2.5 bar. It is
therefore necessary to deflate them and reload them at the pressure
required for the circuit.