Immergas 3.025499, Instruction And Recomendation Booklet

Page: 18 / 68

18
INS
TALLER
US
ER
MAINTEN
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CE TECHNI
CI
AN
1.21 FLUES, CHIMNEYS, CHIMNEY POTS
AND TERMINALS.
The flues, chimneys and chimney pots for the
evacuation of combustion products must be in
compliance with applicable standards. Chimneys
and roof-installed exhaust terminals must com-
ply with the outlet height and with the distance
from technical volumes set forth by the technical
standards in force.
Positioning the wall flue exhaust terminals.
The
wall flue exhaust terminals must:
- be installed on external perimeter walls of the
building;
- be positioned according to the minimum dis-
tances specified in current technical standards.
Combustion products exhaust of natural
draught or fan assisted appliances in open-top
closed environments. In spaces closed on all
sides with open tops (ventilation pits, court-
yards etc.), direct combustion product exhaust
is allowed for natural draught or fan assisted gas
appliances with a heat input range from 4 to 35
kW, provided the conditions as per the current
technical standards are respected.
1.22 CENTRAL HEATING / COOLING
CIRCUIT FILLING.
Once the boiler and the heat pump have been
connected, fill the system via the filling valve (Fig.
2-19). Filling is performed at low speed to ensure
release of air bubbles in the water via the boiler,
heat pump and heating system vents.
The pump may be noisy on start-up due to the
presence of air. This noise should stop after a
few minutes of functioning and however after
having correctly bled the air contained in the
hydraulic circuit.
The boiler features various integrated vent
valves, an automatic one on the circulator, one
on the hydraulic manifold, a manual one on the
condensation module and one on the boiler.
Make sure that the hoods are loosened. Open the
radiator vent valves.
Close radiator vent valves when only water
escapes from them.
Close the filling cock when the boiler pressure
gauge indicates approx. 1.2 bar.
N.B.:
during these operations activate the au-
tomatic vent functions featured on the boiler
(active upon initial ignition) and on the heat
pump (see relative instructions booklet). Vent
the circulation pump by loosening the front cap
and keeping the motor running and assuring that
the liquid that is released cannot cause injury/
damage to persons/objects.
Tighten the cap after
the operation.
1.23 CONDENSATE TRAP FILLING.
On first lighting of the boiler, flue gas may come
out the condensate drain; after a few minutes’
operation check that this no longer occurs. This
means that the drain trap is filled with conden-
sate to the correct level preventing the passage
of flue gas.
1.24 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 open flames;
- bleed all air from the pipelines;
- check that the internal system is properly sealed
according to the specifications set forth by
technical regulations in force.
1.25 SOLAR CIRCUIT START-UP.
Preliminary checks. 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;
- check the functionality of the safety devices,
particularly:
- safety valve (6 bar)
- expansion vessel
- thermostatic mixing valve
- make sure there are no leaks in the hydraulic
circuit;
- make sure there is an air vent valve positioned
in the highest point of the circuit above the
manifold and that it is operational.
If even only a single safety check offers a negative
result, do not commission the system.
Expansion vessel factory-set pressure of the
solar circuit hydraulic unit.
To compensate the high temperatures that
can be reached by the liquid in the circuit and
therefore its dilation, an expansion vessel has
been envisioned that has sufficient 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.
The expansion vessel must be charged to:
1.5 bar + 0.1 bar for every metre of the water
column.
“ metre of the water column” means the vertical
distance that is present between the expansion
vessel and the solar manifold.
Example:
The circulation unit is found on the ground floor
and the solar manifold is found on the roof at a
hypothetical height of 6 m, the distance to be
calculated is:
6 m x 0.1 bar = 0.6 bar
therefore the expansion vessel must be charged
to:
1.5 + 0.6 =
2.1 bar
Hydraulic unit safety valve.
There is a safety valve present on the hydraulic
unit that protects the system from an excessive
increase in pressure. This valve intervenes by
discharging the liquid contained in the circuit
when the pressure reaches 6 bar.
If the safety valve intervenes and therefore part of
the liquid contained in the circuit is lost, it must
be re-integrated.
1.26 SOLAR CIRCUIT FILLING.
N.B.:
If errors occur during installation, opera-
tion and maintenance, due to non compliance
with the technical laws in force, standards or in-
structions contained in this manual (or however
supplied by the manufacturer), the manufacturer
accepts no contractual and extra-contractual
liability for any damages and the appliance war-
ranty is invalidated.
The system can only be filled when:
- any operational residues have been eliminated
that may cause obstructions and deteriorate the
features of the glycol over time;
- any presence of water in the system has been
eliminated, which could otherwise cause dam-
age to the system in winter;
- the absence of leaks has been verified by checks
using air;
- the storage tank unit has been filled;
- the expansion vessel has been charged accord-
ing to system requirements.
The system must be filled only using the glycol
supplied by Immergas via an automatic pump.
The system must be filled with vent valve closed.
Proceed as follows to fill the system:
1 Connect the flow pipe of the automatic pump
to the fitting of the filling valve (9 Fig. 1-28)
located under the pump and open the valve.
2 Connect the return pipe of the automatic pump
to the fitting of the drain valve (8 Fig. 1-28) and
open the drain valve.
3 The flow-rate regulator screw (11 Fig. 1-28)
must be orientated horizontally to ensure the
closure of the integrated ball valve. Open the
ball valve with thermometer (2 Fig. 1-28) above
the pump.
4 Fill the filling pump tank with the amount of
glycol necessary plus a minimum amount to
be left on the bottom of the tank in order to
prevent air circulating inside the circuit.
5 The filling stage must have a minimum dura-
tion of 20 ÷ 25 minutes. This time is required
to completely remove all air from the circuit.
Every now and again open the flow rate regula-
tor adjustment screw in order to eliminate air
from inside (vertical position).
6 Eliminate any air in the solar circuit preferably
using the so-called "pressure shot" method,
which consists in raising the filling pressure of
the circuit followed by a quick opening of the
return valve (8 Fig. 1-28). This method allows
air to be expelled from the circuit.
7 Close the filling cock and switch the filling
pump off, open the regulator screw of the flow
rate regulator (notch in vertical position).
8 Leave the circuit pressurised. Any pressure
drop indicates a leak in the system.
9 Set the functioning pressure in the circuit
at 1.5 bar + 0.1 bar for every metre in the
distance between the solar manifold and the
expansion vessel (practically, set the same
pressure between expansion vessel and system).
N.B.: Do not exceed 2.5 bar.
10 Switch the solar pump on at a maximum
speed and make it run for at least 15 minutes.
11 Disconnect the filling pump and close the
fittings using the relevant screw caps.
12 Open the ball valve above the pump com-
pletely.
Do not fill the system in conditions with strong
insolation and with the manifolds at high
temperatures.
Make sure that all air bubbles have been com-
pletely eliminated.
Solar circuit vent.
Any air present in the system must be bled:
- on start-up (after filling);
- if necessary, e.g. in the case of breakdown.