63EN
cod. 3540000272 - Rev. 01 - 01/2024
Chemical conditioners must ensure complete deoxygenation of the water, contain specific
protective agents for yellow metals (copper and its alloys), anti-scaling agents for lime-
stone, neutral PH stabilizers and, in low-temperature systems, specific 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 flow 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 necessary, to protect the system use a
suitable antifreeze liquid that meets the above requirements and provided for by UNI 8065.
In the presence of adequate chemical/physical system and feed water treatments and re-
lated high cyclicity controls able to ensure the required parameters, 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 specifications.
The presence of deposits on the boiler exchange surfaces due to non-compliance
with the above requirements will involve non-recognition of the warranty.
Frost protection kit for outdoor installation (optional - 013022X0)
In case of installation outdoors in a partially protected place, for temperatures below -5°C and
down to -15°C, the boiler must be fitted with the special frost protection kit. For proper installation,
please refer to the instructions in the kit.
2.4 Gas connection
B
Before making the connection, ensure that the unit is
arranged for operation with the type of fuel available.
The gas connection must be made to the relevant con-
nection (see fig. 37) in compliance with current legis-
lation, using a rigid metal pipe or a continuous wall
flexible hose in stainless steel, placing a gas valve be-
tween the system and boiler. Make sure all the gas
connections are tight. Otherwise there may be a risk
of fire, explosion or suffocation.
2.5 Electrical connections
ATTENTION
B
BEFORE CARRYING OUT ANY OPERATION REQUIR-
ING REMOVAL OF THE CASING, DISCONNECT THE
BOILER FROM THE ELECTRIC MAINS WITH THE
MAIN SWITCH.
NEVER TOUCH THE ELECTRICAL COMPONENTS OR
CONTACTS WITH THE MAIN SWITCH TURNED ON!
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