Potterton NXR4 Installation, Operation & Maintenance Manual page 16

POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
NXR4
Top Flange
Fit the four M16 x 66 studs on the upper part of the
front section. Fit the top flange inserting its gasket and
using four nuts and six washers.
Sensor Pocket
Screw the two sensor pockets into both of the
threaded holes in the top flange.
Sludge Flushing Bottom Flange
Fit four M16 x 66 studs on the lower part of the front
section. A 2" threaded hole is provided on this flange
to enable a flushing valve to be fitted. This is not a
United Kingdom requirement so the 2" blanking plug
provided should be fitted.
Outlet Manifold
Fit the outlet manifold onto the four upper studs on the
rear section with the ½" orifice on the top not
forgetting to insert the gasket (see Fig. 10). Fit the ½"
sensor pocket into this orifice.
Inlet Manifold
Fit the inlet manifold onto the four lower studs on the
rear section with the ½" tapping on the top not
forgetting to insert the gasket. Fit the ½" sensor
pocket into this tapping. Fit the 1" – ¾" reducing bush
into the side tapping and fit the ¾" drain cock into the
bush.
Fig. 9 – Burner Door
Slip on the Welded Flange
Connect the PN16 – DN 125 flanges onto the
pipework then fasten them to the manifolds inserting
the seals (eight HM16 x 75 bolts, eight nuts, and eight
washers for each flange).
Hydraulic Test
After checking the connections proceed slowly with
filling the system ensuring that all air is purged. After
filling carry out the hydraulic test (1.5 x working
pressure).
Flue Hood (see Fig. 10)
Screw the shortest thread section of the four M8 x 40
studs into the upper part of the rear section. Fit and
bond the ceramic cord. Fit the fluehood onto the studs
and fasten with four HM nuts and four washers.
Tighten the nuts.
Flue Connection
Connect by the most direct route possible without
reducing the flue size into the stack. Check for correct
connection.
Flue Access Doors
Screw the eighteen M8 x 45 studs into their positions
in the front section (see Fig. 10). Position the pre-
assembled flue access covers (see Fig. 10). Fasten
into position with the wing nuts provided. On the door
hinge side the access door wing nuts must be
replaced with a standard HM8 nut in order to allow the
door to open.
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SECTION 4
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