Nu-Way MOL 3400-410, Installation & Maintenance Manual

Combustion Chamber Conditions

The combustion chamber conditions should not exceed those shown on page 32 of this manual.   
Burners working with zero rated combustion chamber conditions can be subjected to a maximum negative 
condition of 0.05 kPa (0.5 mbar) 

Oil System

Refer to the drawings on page 10 & 19 for details of the burner oil system. 

Oil Supply to the Burner

The oil supply from the storage tank to the burner may be provided by: 
a.

Single pipe gravity feed system 

b.

Pumped ring main system 

Single Pipe System

The height of the main storage tank above the burner and the sizing of the pipe to the burner must be 
designed so that the oil pressure at the burner oil pump inlet is not less than 35 kPa (0.34 bar).  The 
maximum oil pressure at the burner pump inlet must not exceed 500 kPa (5.0 bar) under any operating 
conditions. 
The pipe must be sized to the full swept volume of the burner oil pump and not the capacity of the burner 
nozzles. 

Pumped Ring Main System

The pumped ring main is the preferred system of oil supply and is essential for multiple burner installations. 
The ring main pumps and supply pipework must be designed to cater for 1.25 times the total swept 
volume of the burner oil pumps connected to the supply system. 
All oil supply pipes must be constructed and installed to comply with local conditions and appropriate 
codes of practice and standards.  All pipework must be firmly supported and a Pressure Reducing Valve 
(PRV) should be fitted to control the supply pressure. 

Burner Pump Capacities

The oil pumps used on Nu-way modulating oil burners are listed in the table on page 26.   It is essential 
that the full swept volume of the pump be considered when oil supply lines or ring main systems are 
calculated. 

Filtration

When using fuel oils filtration of the oil is essential.  The filtration system should be chosen according to the 
individual features of the installation.  The ring main system diagram on page 10 gives guidelines.  When 
the ring main pressure is checked then this should be measured at the burner pump vacuum gauge port to 
allow for any pressure drop across the filters. 
Failure to provide a good clean oil supply will almost certainly lead to premature wear and rapid failure of 
the oil pump unit. 

Electrical Power Supply

A three phase 50Hz supply is required (60 Hz Burners are available on request).  Power requirements are 
tabulated in the 

Appendix 

of this handbook.  The power supply provided must comply with all relevant 

Codes and Standards. 
 
 

MOL 3400-4100  Issue 2   10/08 

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