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oce.9803100601
Figure 1: Hydraulic diagrams for multi-zones heating circuit
MULTI-ZONES INSTALLATION WITH PUMPS
MULTI-ZONES INSTALLATION WITH VALVES
RETURN MANIFOLD/COLLECTOR
BOILER RETURN
BOILER RETURN
RETURN MANIFOLD/COLLECTOR
NO-RETURN VALVES
ZONE VALVES
ZONE PUMPS
FLOW MANIFOLD/COLLECTOR
BOILER FLOW
BOILER FLOW
ADJUSTABLE BY-PASS
FLOW MANIFOLD/COLLECTOR
3. Instruction prior the
installation
This boiler is designed to heat water at lower than boiling temperature at
atmospheric pressure. The boiler must be connected to a central heating
system in compliances and heat output.
Ensure the following operations are carried out:
• Careful washing of all the pipes of the system to remove possible
threat or welding residual and solvents.
• Careful checking that the boiler is fit for operation with the type of
gas available. For more details see the label on the packaging and the
serial number label on the appliance.
• Careful checking that, in case the flue has been connected to pre-exi-
sting flue ducts, thorough cleaning has been carried out in that residual
combustion products may come off during operation of the boiler and
obstruct the flue duct thus engendering dangerous situations.
4. Installation
After determining the exact location of the boiler, installation should be
performed taking account in particular of easy maintenance (the front
door must open).
To evaluate the weight the boiler exerts on the floor it is necessary to take
account of the weight of the water too (see table I or II).
The floor must not be made of flammable materials. If necessary, insert
a panel made of non-flammable, insulating material under the bottom
of the boiler.
4.1. Connecting to the Heating System
Install the heating system starting from the position of the connections
(dimensions and connections are given in table I or II). It is advisable to
install two shut-off cocks on the heating circuit delivery and return lines
so it is possible, in the event of major work, to work without having to
drain the entire heating system.
In addition, it is necessary to install an automatic loading unit and three-
piece joints, on both the water and gas connections.
The FiN models have no expansion tank and safety valve; these de-
vices must be present in the system and suitably sized for the heating
capacity and the capacity of the system itself.
Zone systems equipped with motorized valves must have a bypass con-
nection between the boiler delivery and return with an adjustable overflow
valve in between (the bypass is not necessary in systems equipped with
zone pumps).
The boiler is drained by using the drain cock on the right of the cast-iron
shell (remove the panel of sealed room).
