16
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1.18
FLUE EXHAUST WITH BOILERS IN
CASCADE.
The boilers installed in cascade composed of
any number between 2 and 5 boilers, can be
manifolded to a unique flue exhaust pipe, which
flows into a flue.
Immergas supplied an appropriate and original
flue exhaust system separately to the boilers.
1.19 SYSTEM FILLING.
When the boiler has been connected, fill the sys-
tem. Filling is performed at low speed to ensure
release of air bubbles in the water via the boiler
and heating system vents.
The boiler incorporates two automatic vent
valves fitted on the circulator pump and on the
condensing module. Check if the cap is loose.
Open the radiator vent valves. Close radiator
vent valves when only water escapes from them.
N.B.:
during these operations start up the cir-
culation pump at intervals, acting on the main
switch positioned on the control panel.
Vent the
circulation pump by loosening the front cap and
keeping the motor running
. Tighten the cap after
the operation.
Attention:
this boiler is
not
equipped with an
expansion vessel on the system. It is mandatory
to install a closed expansion vessel to guarantee
correct boiler operation. The expansion vessel
must comply with the European and Austral-
ian standards in force. The dimensions of the
expansion vessel depend on the data relative
to the central heating system. Install a vessel
whose capacity responds to the requisites of the
Standards in force (''R'' collection).
1.20 CONDENSATE TRAP FILLING.
Pre-fill the condense trap with water before
operating the boiler, to ensure products of com-
bustion do not discharge from the trap itself.
1.21 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 the seal of the internal system by follow-
ing the instructions provided by the technical
regulations in force (refer to the pertaining lo-
cal regulations for the "sealing test" on systems
served by single or cascade generators with a
nominal thermal capacity greater than 35 kW.
1.22 BOILER START UP (IGNITION).
To commission the boiler (the operations listed
below must only be performed by a qualified firm
and without any unauthorised persons):
- check that the internal system is properly sealed
according to the specifications set forth by
regulations in force; Up to operating pressures
of 40 mbar it is also possible to use the testing
method adopted by the technical regulations
in force for systems served by single appliances
(or in cascade set-up), with nominal thermal
capacities greater than 35 kW. For greater pres-
sure levels you will need to refer to legislation
in force and/or other effectively tried and tested
methods;
- make sure that the type of gas used corresponds
to boiler settings;
- check that there are external factors that may
cause the formation of fuel pockets;
- switch the boiler on and check correct ignition;
- make sure the fan rpm matches the value pro-
vided in the book (Par. 3.24);
- ensure that the safety device intervenes in the
event of gas supply failure and check the relative
intervention time;
- check activation of the main switch located
upstream from the boiler and in the boiler;
- check that the intake/exhaust concentric ter-
minal (if fitted) is not blocked.
The boiler must not be started up even if only
one of the checks should be negative.
