page no. 23 of 44
NVx Range Users, Installation & Servicing Instructions issue 6.4 Aug 2017.
1. Locate the position of the flue terminal, allowing for
a slight gradient running down from the heater to the
terminal of 2° - 3° and cut a hole to suit.
2. Fit the flue terminal, securing via the wall plate and
weather with silicon sealant or similar.
3. Fit the twin to concentric adaptor to the terminal section
and extend the flue and combustion air ducts to the heater
using straight lengths.
Fit an adjustable length prior to the unit, to facilitate flue
disconnection for servicing. Extend the adjustable lengths
to make the final connection to the appropriate heater
inlet/outlet spigots.
4. Ensure that internal silicon sealing rings are in place and
that all tubes are pushed fully home. Secure concentric
lengths with the locking bands provided.
Fig 1a Individual system - horizontal
Type C12 installation
Terminal
Lengths
Adjustable
length
Single to twin
adaptor
Flue s ocket
Combustion
air duct
Maximum 6m, Minimum 980mm
Combustion
air socket
Note: A terminal guard may be required.
2.2.3.2. Vertical System - Top Outlet
1. Locate the position of the flue terminal cut a hole in the
roof to suit.
2. Fit the flashing and the flue terminal so that the lower
edge of the outer case is over the top of the flashing.
Weather with silicon sealant or similar.
Fit a condensate drain length into the flue socket on
the heater and an equivalent straight length onto the
combustion air socket.
3. Fit the twin to concentric adaptor to the terminal section
and then extend down to the heater using straight lengths.
Fit adjustable lengths as the final connection pieces, to
facilitate flue disconnection for servicing. Extend the
adjustable lengths to make the final connection but do not
exceed the maximum extended length so as to maintain
joint integrity.
Extend the drainage off take of the condensate drainage
length to a suitable gully or drain.
4. Ensure that internal silicon sealing rings are in place and
that all tubes are pushed fully home. Secure concentric
lengths with the locking bands provided.
Fig 1b Individual system - vertical
Type C32 installation
Maximum 6m
Minimum
80Ø - 1480mm
100Ø - 1560mm
130Ø - 1860mm
Terminal
Lengths
Adjustable
lengths
Single to twin
adaptor
Flashing
Flue s ocket
Combustion air
socket
Condensate drain
length
2.2.3.3. Internal Combustion Air System
1. Complete the run of flue sections from the terminal
spigot to the flue outlet socket of the heater generally as
described in 2.2.3.1. and 2.2.3.2., ensuring that the internal
silicon sealing rings are in place.
2. It is recommended that both air inlets are utilized and
that both are fitted with the mesh inlet plates supplied. In
addition a 90° bend should be fitted to the rear inlet, the
inlet opening of the bend facing to the side of the heater
i.e. away from the main air fan.
Fig 2a Exhaust only system - horizontal
Type B22 installation
Terminal
Lengths
Adjustable
length
Flue
outlet
OPTION 2
Combustion air entry
(fitted with inlet grille and
inlet bend (not shown))
12m maximum, Minimum 980mm
OPTION 1
Combustion air entry
(fitte d with i nlet g rille)
Note: A terminal guard may be required.
