Connecting The Gas Supply; Connections - Potterton NXR3 Installation, Operation And Maintenance Manual

POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
NXR3

CONNECTIONS

Boiler & Burner Power Supply
The NXR3 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
normally required. The burner is normally powered
from the instrument panel lead provided.
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. 18 – Boiler & Burner Power Supply
Single Phase
Supply
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 the burner manufacturers
specification), see Fig. 18. Install a separate 220 –
240V 50Hz single-phase electrical supply derived
from the three-phase supply to the boiler instrument
panel. This is fused 6.3A in the instrument panel.
Volt Free Contacts
Volt free remote status contacts should be taken from
the control panel where a 24V signal is provided, see
section 6 for further details.

CONNECTING THE GAS SUPPLY

The connection should be made to the burner
connection (see burner card enclosed with this
manual for size required). A union and isolating valve
M
should be fitted close to the burner to allow
disconnection of the burner for maintenance and
repair.
The gas supply should be made through a suitable
meter and the local gas undertaking should be
consulted to determine the suitability of the meter
and gas supply to meet existing and additional
demands for gas.
Three Phase Supply
Common Fused Isolator
Single Phase Supply
Ctrl Panel
Isolator
SECTION 4
PAGE 21
M
Burner
M
Motor
Burner Control
Box