Potterton NXR4 Installation, Operation & Maintenance Manual page 15

SECTION 4
PAGE 14
PULLING UP THE SECTIONS
In order to erect the boiler it is necessary to use a set
of assembly tools, please find options available:
1 Use our Potterton
Department to erect the boiler.
2 Purchase of assembly tools from ourselves.
3 Supply your own assembly tools.
Note: Sections should be pulled together one at a
time.
In each case the following method of assembly is
recommended.
1 Assemble the top and bottom pulling up bars
through the top and bottom nipple ports and pull
up the sections until metal to metal contact is
made. This will cause the compound between the
sections to squeeze out.
The sections should be pulled up evenly applying
equal pressure to top and bottom pulling up bars.
Section alignment should be checked throughout
the process.
To ease assembly tap around the periphery of the
sections with a mallet.
NEVER HIT THE MACHINED SURFACES.
2 Proceed for the other sections one by one as
before.
CAUTION: It is imperative that the intermediate
section assembly order is adhered to (see Fig. 6).
The markings AR, M and AV (see Fig. 5) must
always be pointing towards the front and all
arrows must face the same way.
After having assembled three or four sections fit the
rear Stainless Steel Furnace Protective Plate in
position against the rear section (see Fig. 10).
Complete the assembly with the front section
proceeding as before.
3 Keep the assembly tight and seal the joints
externally as follows:-
i) Clean the "V" groove between each pair of
sections and allow to dry.
ii) Apply the silicone seal with the gun provided
(see Fig. 7).
iii) Smooth the bead with a damp tool (eg. A
spatula).
POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
Commercial Service
Fig. 7 – Sealing
Silicone Seal
4 Fit the tie rods and tighten as follows:-
Fit the special spring washers (see Fig. 8) at the
rear ends of the rods. Tighten the nuts leaving a
1mm gap between each turn of the spring washer.
This operation should be carried out one rod at a
time.
Fig. 8 – Tie Rod Fixing
5 Loosen the assembly bars and remove
6 Continue with assembly of the boiler.
EXCHANGER ASSEMBLY
Open the "Accessories for Exchanger" package.
Flow Distributor
Insert eight M16 x 65 studs around the rear section
flow and return orifices. If necessary on sizes 412 to
417 insert the flow distributor with its gasket (see Fig.
10) into the return orifice.
Boiler Set Up
Set the exchanger in its final position and ensure it is
level. Ensure that each section is in contact with the
base, if not use metal shims.
NXR4
Assembly Tools
1mm