SECTION 4
POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
PAGE 20
NXR3
Fig. 16 – Cable & Capillary Tubes Routing
Fig. 17 – Fitting Thermometer into Flue
Burner Cables
The NXR3 is supplied as standard fitted with a 7-pin
and a 4-pin Weiland plug for connection to the
burner.
High/Low Burner
The 7-pin and 4-pin Weiland plugs should be
connected to the respective plugs provided on the
burner.
On/Off Burner
The 7-pin Weiland plug should be connected to the
respective plug provided on the burner. The 4-pin
plug should be disconnected at the terminal
connection in the instrument panel and disgarded
(see wiring diagram).
FITTING THE BURNER
1. Check that the burner which has been supplied is
the correct burner for the boiler, by checking the
specification on the burner card provided.
2. Fit the burner adaptor plates and boiler gasket to
the boiler using the fixing screws provided.
3. Place the burner gasket over the burner fixing
studs.
4. Insert the burner draught tube into the firing door
aperture with the gasket in position on the
mounting flange. Secure in position with the nuts
and washers provided.
5. Connect the fuel supply to the burner. The fuel
supply pipes should be self supporting and not
apply undue pressure on the burner.
6. Connect the burner cable and plug to the
Weiland plugs from the control panel.
7. Check that the weight of the burner has not
affected the sealing of the door to the front
section, especially after the door has been
opened and closed several times.
8. Larger burners, especially dual fuel types, should
be supported independently with a suitable
device whilst still allowing the door to be opened.
Capillaries
Earth Wire
Clamp nut A
Front
cross-
member
Burner Leads
Casing Frame
Cross Member
Ø7.5
Thermometer
Phial
Holding
Clip
Flue
Stack