3.2 Mounting the Boiler to the Wall
Navien NCB LHWE boilers come with an upper mounting
bracket that is pre-drilled at 400 mm on center for easy
installation on standard wall studs. If the strength of the wall
is insufficient or if the framing is non-standard or uneven,
reinforce the area before installing the boiler. Avoid installation
on common walls as the unit will make some operational noises
while it is running.
To mount the boiler to the wall:
1. Affix the bracket securely to the wall and ensure that it is
level and that it can support the weight of the boiler.
2. Align the grooves on the back of the boiler with the tongues
on the mounting bracket and hang the boiler on the
bracket.
When mounted with the mounting bracket, the boiler will
have a 16 mm clearance from the back of the wall.
WARNING
The boiler is heavy. Always lift the unit with assistance. Be
careful not to drop the boiler while lifting or handling it
to avoid bodily injury or damage to the unit.
Do not rest the boiler on the bottom end after removing
it from the shipping carton. Doing so may result in
excessive pressure on protruding pipes and result in
product damage. If you must put the boiler down, lay it
on its back or put it inside the protective shipping base.
DANGER
The boiler must be mounted on a suitable wall that can
support its weight and prevent explosion or fire.
Do not install the boiler near paper or other flammable
objects.
Do not install the boiler near domestic waste.
The installation must be made by sufficiently qualified
technicians, authorised to do so. For correct installation, all
the requirements and recommendations described in the
Regulation for Heating Installations in Buildings (RITE) must
be complied with, together with all other national and/or local
regulations applicable at the time of installation. However, the
following recommendations must be complied with:
Before connecting the boiler hydraulically, the inside of the
pipes must be thoroughly cleaned, removing all sediment of
any type which could cause oxidation or damage to the heat
exchanger.
It is recommended to fit shut-off valves to the heating
installation output and return pipes, to avoid having to drain
the installation when maintenance work is carried out on the
boiler.
Bleed the air from the boiler and heating installation. Ensure
there is no air in the heating circuit.
The NCB LHWE boiler is a condensing boiler, and it is
therefore essential for the condensate outlet to lead to a
drain, in compliance with all applicable national and/or local
regulations to this respect.
The boiler drain must not be located above a window, entry
door or other public point of access. Bear in mind that boiling
water or steam could come out when draining.
Draining must be done in a downward direction and towards
the walls.
WARNING
Tighten the boiler water connections, taking care not
to damage them. Do not force the tube connections
excessively, as this could damage the connections and
cause leaks.
Any dirt in the tubes could reduce boiler efficiency and
cause it to malfunction.
Any pipes exposed to the elements or which could freeze
in winter must be insulated with suitable insulating
material.
CAUTION
Failure to follow the instructions provided in this section will
void the warranty and may result in property damage, fire
or serious injury.
4. Installing the System Piping
4.1 Installing a Space Heating System
The primary and secondary heat exchangers of the Navien
NCB LHWE boiler are designed to attain the highest level of
heat transfer in a compact design. To accomplish this, the
heating water flows through a series of tubes (secondary
heat exchanger) and finned tubes (primary heat exchanger),
designed to maximise the heat transfer area. To maintain the
efficient and reliable operation of the heat exchangers, and to
avoid heat exchanger failure, it is critical to ensure the rules and
guidelines in this section are followed.
CAUTION
The installation must be made by sufficiently qualified
technicians, authorised to do so.
For correct installation, all the requirements and
recommendations described in the Regulation for
Heating Installations in Buildings (RITE) must be
complied with, together with all other national and/or
local regulations applicable at the time of installation.
Refer to the following illustration for a typical heating piping
example for the boiler.
Union
CH Flow
CH Return
Bottom View
Floor Heating Circuit or
Heating Circuit (Radiator)
Heating Supply
Adapter
Heating Return
Adapter
When connecting the space heating system, follow these
guidelines:
Tighten the connection valves with care to avoid damage.
Test the boiler for proper space heating flow and inspect for
leaks.
20 Installing the Boiler
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