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Connection to collective fl ues or single fl ues with natural draught
If you are then going to connect the Optimax 25 OV boiler to a collective fl ue or a single fl ue with
natural draught, the fl ue must be expressly designed by professionally qualifi ed technical personnel in
conformity with the standards and rules in force.
In particular, fl ues must have the following characteristics:
• Be sized according to the method of calculation stated in the standard
• Be airtight to the products of combustion, resistant to the fumes and heat and waterproof for the
condensate
• Have a circular or quadrangular cross-section (some hydraulically equivalent sections are permissible),
with a vertical progression and with no constrictions
• Have the fl ue conveying the hot fumes adequately distanced or isolated from combustible mate-
rials
• Be connected to just one unit per fl oor, for at most 6 units in all (8 if there is a compensation duct or
opening)
• Have no mechanical suction devices in the main ducts
• Be at a lower pressure, all along their length, under conditions of stationary operation
• Have at their base a collection chamber for solid materials or condensation of at least 0.5 m, equipped
with a metal door with an airtight closure.
2.7 Condensate outlet connection
The boiler is equipped with an internal air-trap to drain off the condensate. Fit the inspection bowl A
and the hose B, pushing it on for approximately 3 cm and securing it with a hose clamp.
Fill the air-trap with approximately 0.5 ltrs of water and connect the hose to the household waste
system.
22
A
B
Optimax 25 OV
0,5 lt.
fi g. 14
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