Ferroli ATLAS D 25 K 100 UNIT Instrucciones De Uso, Instalación Y Mantenimiento página 42

Install on the system delivery the non-return valve "A" (see fig. 18) supplied
with the boiler, interposing the gasket "B". Respect the direction of the arrow
on the valve.
A
fig. 18 - Non-return valve installation
High efficiency hot water tank circulating pump
For proper operation of the boiler ATLAS D 25 K 100 UNIT, the speed selector (see
fig. 19) must be set to position III.
High efficiency heating circulating pump
The factory setting is suitable for all installations; however a different operation strategy can be set,
depending on the characteristics of the system.
Setting Dp-v
Proportional head
Min
.
1
I
4
7
III
fig. 20
- Proportional Head Dp-v setting (fig. 20)
The circulating pump head will be automatically reduced with the decrease in flow rate required by
the system. This setting is optimum for systems with radiators (2 pipes or single pipe) and/or ther-
mostatic valves.
The strong points are the reduction in power consumption with the decrease in system demand
and reduction of noise in radiators and/or thermostatic valves. The operating range is from min. (1)
to max. (7).
- Setting Fixed speed (fig. 21)
The circulating pump does not modulate its power. The operating principle is that of conventional
3-speed circulating pumps (with a reduction in power consumption compared to them). The oper-
ating range goes from speed 1 (I) to speed 3 (III).
Water system characteristics
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO3), use suitably treated water in
order to avoid possible scaling in the boiler. Treatment must not reduce the hardness to values
below 15°F (Decree 236/88 for uses of water intended for human consumption). Treatment of the
water used is indispensable in case of very large systems or with frequent introduction of replen-
ishing water in the system.
If water softeners are installed at the boiler cold water inlet, make sure not to reduce the
water hardness too much, as this could cause early deterioration of the magnesium an-
ode in the hot water tank.
Antifreeze system, antifreeze fluids, additives and inhibitors
The boiler is equipped with an antifreeze system that turns on the boiler in heating mode
when the system delivery water temperature falls under 6°C. The device will not come
on if the electricity and/or gas supply to the unit are cut off. If it becomes necessary, it is
permissible to use antifreeze fluid, additives and inhibitors only if the manufacturer of
these fluids or additives guarantees they are suitable for this use and cause no damage
to the heat exchanger or other components and/or materials of the boiler unit and sys-
tem. It is prohibited to use generic antifreeze fluid, additives or inhibitors that are not ex-
pressly suited for use in heating systems and compatible with the materials of the boiler
unit and system.
EN
B
Min
.
1
I
4
II
7
III
fig. 19
Setting
Fixed speed
Min
.
1
4
II
7
fig. 21
ATLAS D 25 K 100 UNIT
3.4 Burner connection
The burner is equipped with flexible pipes and a filter for connection to the oil feed line.
Run the flexible pipes out of the back and install the filter as indicated in fig. 22.
The oil feed circuit must be made according to one of the following diagrams, without ex-
ceeding the pipe lengths (LMAX) given in the table.
I
II
III
cod. 3541I100 - Rev. 03 - 04/2018
fig. 22 - Fuel filter installation
fig. 23 - Gravity feed
fig. 24 - Suction feed
fig. 25 - Siphon feed