Boiler Start Up (Ignition) - Immergas HERCULES Solar 26 1 A Instruction Booklet And Warning

Expansion vessel pre-charged 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-charged
at 1 bar. It is therefore necessary to charge them
to the pressure necessary for the circuit.
The expansion vessel must be charged to:
2 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 collector.
Example:
The circulation unit is found on the ground floor
and the solar collector 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:
2 + 0,6 = 2.6 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, this
must be re-integrated.
1.16 SOLAR CIRCUIT FILLING.
N.B.: if errors occur during installation, running
and maintenance, due to the non-compliance of
technical laws in force, standards or instructions
contained in this book (or however supplied by
the manufacturer), the manufacturer is excluded
from any contractual and extra-contractual
liability for any damages and the appliance war-
ranty is invalidated.
The system can only be filled when:
- any working residues have been eliminated that
cause obstructions and through time deterio-
rate the features of the glycol;
- all presence of water in the system has been
eliminated, which could cause damage to the
Total head available to the system.
C
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 accor-
ding 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 automatic pump flow pipe to the
filling valve fitting (9 Fig. 1-22) positioned
below the pump and open the valve itself.
2 connect the automatic pump return pipe to the
draining valve fitting (8 Fig. 1-22) and open the
draining valve.
3 The flow rate regulator adjustment screw (11
Fig. 1-22) must be horizontal in order to gua-
rantee closure of the integrated ball valve. Open
the ball valve with thermometer (12 Fig. 1-22)
positioned over the pump.
4 fill the filling pump tank with the amount of
glycol necessary plus a minimum stock to
be left on the bottom of the tank in order to
prevent air circulating inside the circuit.
5 The filling phase must have minimum duration
of 20 ÷ 25 minutes. This is the time needed to
completely remove all air from the circuit. Eve-
ry now and again open the flow rate regulator
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. 1-22). This method allows
to expel the air from the circuit.
7 Close the filling valve and switch the filling
pump off, open the adjustment screw of the
flow rate regulator (notch in vertical posi-
tion).
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 collector and the expansion
vessel (practically, set the same pressure betwe-
en expansion vessel and system).
A
B
Flow rate (l/h)
N.B.: Do not exceed 2.5 bar.
10 Switch the solar pump on at a maximum
speed and make it function for at least 15
minutes.
11 Disconnect the filling pump and close the
fittings using the relevant screwing plugs.
12 Open the ball valve above the pump comple-
tely.
Do not fill the system in conditions with strong
insolation and with the collectors 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.
Important: danger of burns from the liquid
contained in the collectors.

1.17 BOILER START UP (IGNITION).

For issue of the envisioned Declaration of Con-
formity, the following must be performed for
boiler start-up:
- check that the internal system is properly sealed
according to specifications;
- make sure that the type of gas used corresponds
to boiler settings;
- switch the boiler on and ensure correct igni-
tion;
- make sure that the gas flow rate and relevant
pressure values comply with those given in the
manual ( Par. 3.17);
- ensure that the safety device is engaged in the
event of gas supply failure and check activation
time;
- check activation of the main switch located
upstream from the boiler and in the boiler;
- check that the concentric intake-exhaust ter-
minal (if fitted) is not blocked.
The boiler must not be started up even if only
one of the checks should be negative.
N.B.: the boiler preliminary check must be carried
out by a qualified technician. The conventional
boiler warranty is valid as of the date of testing.
The test certificate and warranty is issued to the
user.
A = Head available to the system with
zone pump at maximum speed
B = Total head available to the system
with zone pump at speed 4,5
C = Total head available to the system
with zone pump at speed 3
PL
CZ
HU
RO
IE
SK
131
Fig. 1-20