FL D CONDENS LN F24
35
EN
cod. 3541P661 - Rev. 00 - 06/2019
System draining
The drain faucet ring nut is located under the safety valve inside the boiler.
To drain the system, turn the ring (ref. 1 - fig. 9) counter-clockwise to open the faucet. Do
not use any tools; use hands only.
To drain only the water in the boiler, first close the shut-off valves between the system
and boiler before turning the ring.
fig. 9- Safety valve with drain faucet
3. INSTALLATION
3.1 General Instructions
BOILER INSTALLATION MUST ONLY BE PERFORMED BY QUALIFIED PERSON-
NEL, IN ACCORDANCE WITH ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL
MANUAL, THE PROVISIONS OF CURRENT LAW, THE PRESCRIPTIONS OF NA-
TIONAL AND LOCAL STANDARDS AND THE RULES OF PROPER WORKMANSHIP.
3.2 Place of installation
B
The combustion circuit is sealed with respect to the place of installation
and therefore the unit can be installed in any room except in a garage. The
place of installation must be sufficiently ventilated to prevent the creation
of dangerous conditions in case of even small gas leaks. Otherwise there
may be a risk of suffocation and intoxication or explosion and fire. This
safety precaution is required by EEC Directive No. 2009/142 for all gas
units, including so-called sealed chamber units.
The unit is designed to operate in a partially protected place, with a minimum tempera-
ture of -5°C. If provided with the special antifreeze kit, it can be used with a minimum tem-
perature down to -15°C. The boiler must be installed in a sheltered place, for instance
under the slope of a roof, inside a balcony or in a protected recess.
The place of installation must be free of flammable materials, objects and dusts or cor-
rosive gases.
The boiler is arranged for wall mounting and comes as standard with a hooking bracket.
Wall fixing must ensure stable and effective support for the generator.
A
If the unit is enclosed in a cabinet or mounted alongside, there must be sufficient
space for removing the casing and for normal maintenance activities
3.3 Plumbing connections
Important
B
The safety valve outlet must be connected to a funnel or collection pipe to pre-
vent water spurting onto the floor in case of overpressure in the heating circuit.
Otherwise, if the discharge valve cuts in and floods the room, the boiler manu-
facturer cannot be held liable.
B
Before making the connection, check that the unit is arranged for operation with
the type of fuel available and carefully clean all the system pipes.
Carry out the relevant connections according to the diagram in fig. 24 and the symbols
on the unit.
Note:
The unit is equipped with an internal bypass in the heating circuit.
System water characteristics
B
FL D CONDENS LN F24
boilers are suitable for installation in heating systems
with non-significant entry of oxygen (ref. systems "case I" EN14868). A physical
separator (e.g. plate heat exchanger) must be provided in systems with contin-
uous entry of oxygen (e.g. underfloor systems without antidiffusion pipes or
open vessel), or intermittent (less than 20% of system water content).
The water within a heating system must have the characteristics required by
UNI 8065, and comply with laws and regulations in force and the provisions of
EN14868 (protection of metallic materials against corrosion).
The filling water (first filling and subsequent replenishment) must be clear, with
the hardness indicated in the table below and treated with chemical condition-
ers that prevent encrustations, corrosive or aggressive phenomena on metals
and plastics, the formation of gas, and the proliferation of bacterial or microbial
masses in low temperature systems.
The water contained in the system must be checked periodically (at least twice
a year during the seasons of use, as required by UNI8065) and possibly have
a clear appearance and must comply with the limits given in the following table.
It must contain chemical conditioners in a concentration sufficient to protect the
system for at least one year. Bacterial or microbial loads must not be present
in low temperature systems.
Only use conditioners, additives, inhibitors and antifreeze liquids declared by
the producer suitable for use in heating systems and that do not cause damage
to the heat exchanger or other components and/or materials of the boiler and
system.
Chemical conditioners must ensure complete deoxygenation of the water, con-
tain specific protection for yellow metals (copper and its alloys), anti-fouling
agents for scale, neutral pH stabilizers and, in low-temperature systems, spe-
cific biocides for use in heating systems.
Recommended chemical conditioners:
SENTINEL X100 and SENTINEL X200
FERNOX F1 and FERNOX F3
The unit is equipped with a frost protection system that activates the boiler in
heating mode when the system delivery water temperature falls below 6°C. The
device is not active if the power and/or gas supply to the unit is turned off. If nec-
essary, for system protection use a suitable antifreeze liquid that meets the
same requirements as set out above and provided for by UNI 8065.
In the presence of adequate chemical/physical system and feed water treat-
ments and related high cyclicity controls able to ensure the required parame-
ters, for industrial process applications the product can be installed in open-
vessel systems with vessel hydrostatic height able to ensure compliance with
the minimum operating pressure indicated in the product technical specifica-
tions.
The presence of deposits on the boiler exchange surfaces due to non-
compliance with the above requirements will involve non-recognition of
the warranty.
Antifreeze system, antifreeze fluids, additives and inhibitors
When necessary, antifreeze fluids, additives and inhibitors can be used only if the man-
ufacturer of such fluids or additives guarantees that they are suitable and do not cause
damage to the exchanger or other components and/or materials of the boiler and system.
Do not use generic antifreeze fluids, additives or inhibitors that are not specific for use in
heating systems and compatible with the materials of the boiler and system.
1
EXISTING SYSTEM
NEW SYSTEM
WATER PARAMETER
P < 150 kW
P > 150 kW
P < 150 kW
P > 150 kW
Total filling water hardness (°F)
<10
<5
<10
<5
Total system water hardness (°F)
<15
<10
<10
<5
PH
7 < Ph < 8.5
7 < Ph < 8.5
Copper Cu (mg/l)
Cu < 0.5 mg/l
Cu < 0.5 mg/l
Iron Fe (mg/l)
Fe < 0.5 mg/l
Fe < 0.5 mg/l
Chlorides (mg/l)
Cl < 30 mg/l
Cl < 30 mg/l
Conductivity (µS/cm)
< 200 µS/cm
< 200 µS/cm
