Navien LCB700-21RS Installation & Operation Manual Download

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20 Installing the System Piping

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:

Prior to connecting plumbing to the boiler, flush the entire
system to ensure it is free of sediment, flux, solder, scale,
debris or other impurities that may be harmful to the system
and boiler. During the assembly of the heating system, it is
important to keep the inside of the piping free of any debris
including construction dust, copper burr, sand and dirt.

For retrofits, all system piping including radiators, must be
cleaned of all build-up including sludge and scale. All systems,
old and new, must be cleaned to remove flux, grease and
carbon residue. Navien recommends cleaning the boiler
system with cleaning products specially formulated for boiler
systems. For retrofit applications with heavy lime scale and
sludge deposits, a heavier duty cleaner may be required.
For information on performing the cleaning, follow the
instructions included with the boiler system cleaner products.

If the boiler is installed in an existing system, any unsuitable
additives must be removed by thoroughly cleaning the
system. Cleaning of all the systems must be done in
compliance with the requirements in standard BS 7593. In
areas with hard water, treatment may be necessary in order to
prevent scale from forming in the boiler. Make sure to use the
water treatment product in the right concentration, according
to the producer’s instructions.

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 LCB700 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.

4. Installing the System Piping

WARNING

Failure to rid the heating system of the contaminants
listed above will void the warranty and may result in
premature heat exchanger failure and property damage.

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.