Potterton NXR4 Installation, Operation & Maintenance Manual page 12

POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
NXR4
BOILER ERECTION
SECTION ASSEMBLY
The boiler sections are not self-supporting until the
boiler block is fully assembled. The sections are
connected using a nipple system. To ensure a sound
water tight fit nipple sealing paste is provided for
assembling the sections.
IMPORTANT: Ensure the boiler is adequately
supported especially when pulling up sections.
The Manual Handling Regulations should be
followed.
Erect the Boilers as follows: -
1 Open the boiler fittings box.
2 Clean the nipples using a solvent cleaner (not
supplied), ensuring all guidelines are followed.
3 Clean both the top and bottom nipple ports of all
sections with a solvent cleaner and ensure that
they are rust free, dirt-free and burr free, if
necessary clean with emery cloth.
4 Stand the rear section up and ensure that it is
supported securely.
handling techniques are used.
5 On the rear section clean the groove with a metal
brush prior to application of the heat-resisting
compound. Paste the machined edges and
external groove (see Fig. 5)
CAUTION: To ensure leak free assembly never use
old nipples and only use the special compounds
supplied with the boiler.
6 Using a clean brush coat the nipples and nipple
ports with the compound supplied.
7 Insert the nipples into the nipple ports by hand
and using a piece of wood and a hammer/mallet
gently drive the nipples into place. Do not drive
them in too far as tightening should be achieved
when bringing the sections together.
Ensure that the nipples fit square and check depth
of penetration by using the template supplied (see
Fig. 5).
Ensure that the nipples are correctly aligned
as an out of line nipple can cause the section
to crack when it is pulled up.
8 Clean the nipple ports on the rear intermediate
section and apply the sealing compound. Position
the intermediate next to the rear section with the
letters AR facing forwards.
Ensure correct manual
9 Slide the sections
intermediate section nipple ports slightly engage
with the corresponding nipples on the rear
section. Ensure all manual handling techniques
are adhered too.
10 Using a piece of wood and a hammer/mallet hit
the top and bottom
intermediate section alternately so as to achieve
temporary assembly. Ensure that they fit perfectly
and squarely and then proceed with tightening as
described under "Tightening the Sections".
Ensure that the intermediate section is aligned
parallel to the rear section.
11 Apply the heat-resisting compound to the nipple
ports ready to receive the next section.
SECTION 4
PAGE 11
together so that the
nipple ports on the