Potterton NXR4 Installation, Operation & Maintenance Manual page 24

POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
NXR4
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.
CONNECTIONS
Boiler & Burner Power Supply
The NXR4 is supplied with either single phase or
three phase burners. The electrical supply to the
boiler installation should be connected via a fused
isolator.
Single Phase Installation
Install a 230V 50Hz single-phase electrical supply
(min cable rating – 6.3A) to the boiler instrument
panel. No separate electrical supply for the burner is
required. The burner is powered from the instrument
panel lead provided (FIG 18).
Fig. 18 – Boiler & Burner Power Supply
Single Phase
Supply
Note – the following single phase burners must
have a separate mains supply for the burner
motor as Fig. 18A.
Nu-Way – NGN15 & NGN25 & NOL20
EOGB – BG500, B50 & B55, B45, BG450
Fig. 18A – Boiler & Burner Single phase Supply
Single Phase Supply
Common Fused Isolator
Single Phase Supply
Three Phase Installation
CAUTION: If the burner motor is supplied with three-
phase power, control panel single-phase supply must
be taken from one of the phases supplying the burner
motor.
Install a three-phase supply direct to the burner via a
fused isolator (sized to fit the burner manufacturers
specification), see Fig. 18. Install a separate 220 –
240V 50 Hz single-phase electrical supply derived
from the three-phase supply to the boiler instrument
panel. This is fused 6.3A in the instrument panel.
Three Phase Supply
Common Fused Isolator
Single Phase Supply
Ctrl Panel
Isolator
SECTION 4
PAGE 23
M
M
Burner
M
Motor
Burner Control
Box