Electrical installer
Installation, use and maintenance manual – Next-G
35
4
to the sewerage system.
Figure 3.9
Detail of the installation of the condensate drain
siphon
A Ø 18 mm condensate discharge connection (to be provided by
the installer)
B
Upper seal
B
A
3.4.3
Flue gas condensate drain manifold
To make the condensate drain manifolds:
▶
Size the ducts for maximum condensation flow rate
(Table 1.2
▶
Use plastic materials resistant to acidity pH 3-5.
▶
Provide for min. 1% slope, i.e. 1 cm for each m of the
length (otherwise a booster pump is required).
▶
Prevent freezing.
3.5
AIR DUCTING
Only models equipped with a centrifugal fan (Next-G C
series) can be combined with air ducting systems, which
can be positioned both on the air intake (with or without
mixing chambers) and on the delivery.
For this purpose, the delivery outlet of the Next-G C gas
unit heaters is provided with fixing flanges for the delivery
air ducting.
Refer to the Paragraph 1.2.2
p. 15 for the dimensions of
the flange connection.
In order to avoid vibrations (possible source of
noise and mechanical failures), it is advisable to
install anti-vibration connections, easily removable
for maintenance operation, at the connection be-
tween the gas unit heater and the air duct.
Set up the air ducting using a traditional sufficiently
smooth sheet metal duct.
The insulation of the duct must be assessed, in order to
avoid heat losses.
For the dimensioning of the air duct, consider the data
of air flow and available head of the fan, summarized in
Table 1.2
Minimum pressure drop on heat flow delivery
The Next-G C gas unit heaters do not require a min-
imum pressure drop on the heat flow delivery.
4
ELECTRICAL INSTALLER
4.1
WARNINGS
General warnings
Read the warnings in Chapter III
p. 4, provid-
ing important information on regulations and on
safety.
Compliance with installation standards
Installation must comply with applicable regula-
tions in force, based on the installation Country
and site, in matters of safety, design, implementa-
tion and maintenance of electrical systems.
Installation must also comply with the manufactur-
er's provisions.
Live components
After placing the appliance in the final position,
and prior to making electrical connections, ensure
not to work on live components.
Earthing
The appliance must be connected to an effective
earthing system, installed in compliance with reg-
ulations in force.
It is forbidden to use gas pipes as earthing.
Cable segregation
Keep power cables physically separate from signal
ones.
Do not use the power supply switch to turn the
appliance on/off
Never use the power supply switch to turn the ap-
pliance on and off, since it may be damaged in the
long run (occasional blackouts are tolerated).
To turn the appliance on and off, exclusively use
the suitably provided control device.
4.2
ELECTRICAL SYSTEMS
Electrical connections provide:
A. Power supply (Paragraph 4.3 p. 36).
B. Control system (Paragraph 4.4 p. 36).
C. Probe inputs (Paragraph 4.5 p. 42).
D. 0-10 V input (optional, Paragraph 4.6 p. 44).
