Datasheet Content
deltapumps.com
A
AD
Oil burners fuel unit
DE116-0111
deltapumps.com
DELTA – TECHNICAL MANUAL
Oil burners fuel unit
Type A, AD
On initial commissioning, it is possible to bleed the air
more quickly, through the pressure gauge port.
Because a vacuum now exists oil, due to atmospheric
pressure, enters the suction chamber through the filter.
1- Applications From the suction side, the gears pass the oil to the
pressure chamber, where it comes up against the head
The DELTA aluminium fuel unit type A is an efficient and of the piston. Due to the build up of pressure, the piston
modern oil burner pump, provided with bilateral delivery is forced back against the pressure regulating spring.
ports. Hub and shaft sizes are manufactured to In the A type the flow of pressurized oil is interrupted by
international standards (EN 225-1), so it can be fitted to an incorporated solenoid valve (10), and can, therefore,
every oil burner. be opened following the start of the motor (pre-purge), or
The pump type A is designed for pumping oil in high interrupted before stopping the motor itself (instant shut-
pressure oil burners and transfer pump applications. Its off of the flame preventing the nozzle dripping). The
features allow an easy pump replacement with every excessive oil discharges to the return side (or by-passes
other type of oil pump: the same unit is provided with in the one pipe version). It will be realized of course that
nozzle port in both the left and right sides. the spring tension, which is varied by the regulating
screw (1), regulates the pressure of oil required.
WARNING
For the use with low viscosity fuel (lower than The AD type does not have an integrated cut-off system.
2.5cSt, i.e. Kerosene) standard pump can be used When the burner motor starts, the oil will be discharged
without exceeding 12 bar. from delivery ports straight away.
To pump biodiesel or fuel containing it in any WARNING
percentage, it is necessary the “B” version with
If the AD pump is used to provide oil to the nozzle, a
special seals. On request the pump can be provided shut-off valve must be fitted in the nozzle line.
free of nonferrous metals.
This unit must not be used to pump water or acid. The pump can be converted from the two pipe version to
the single pipe version, removing the bypass plug (4)
from the vacuum port.
2- Operation When the unit is converted to the single pipe version, on
The type A fuel unit consists of a pump, solenoid valve initial commissioning the air must be bled through the
(A type only), filter and pressure regulator. The pumping pressure gauge port (in this case lift installation are not
action is obtained from two spur gears (2), one of which recommended).
is connected to the drive shaft (3). The aluminium pump The cartridge filter (11) located in the front side, allows
casting provides the various oil ways, for the suction (6), an easy cleaning without to dismount any part of the
return (5) and nozzle ports (9). Pressure (8) and vacuum unit.
(7) gauge ports are also provided.
On start up, the rotating gears purge the air from the
suction chamber, through a vent groove in the piston to
the return line in two pipe version, and through the
nozzle line (after the solenoid valve opening) in one pipe
version.
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DELTA – TECHNICAL MANUAL
3- Pump identification A 1 R 2 F A
Pump type
A = with built-in solenoid valve
AD = without solenoid valve
B prefix = biodiesel version
(explicit request for nonferrous metals absence)
Nozzle capacity
(see graph)
Rotation (seen from shaft end)
R = clockwise
L = counter clockwise
Pipes system
1 = one pipe
2 = two pipes
Coil type
F = NF84 (coil with connector plug)
Coil power supply
A = 230 VAC 50/60Hz
B = 110 VAC 50/60Hz
C = 24 VAC 50/60Hz
4- Technical specifications
Oil viscosity …………………………………. 1,2 ÷ 12 cSt
Oil temperature ……………………………... 60°C max.
Power consumption ………………………... See graphs
Nozzle capacity ……………………………... See graphs
Fine adjustable pressure …….................... 6 ÷ 20 bar
Minimum pressure …………………………. 2,5 bar (for oil transfer applications)
Suction line vacuum ……………………….. 0,5 bar max.
Suction line pressure ……………….……... 2 bar max.
Return line pressure ……………………….. 2 bar max.
Starting torque ……………………………… 0,1 Nm max.
Rotation speed ……………..………….……. 3500 rpm max.
Standard strainer …..….….………………... Stainless steel mesh 130µ, 11cm²
Dimensions (EN 225-1) .……………………. Hub Ø32, shaft Ø8
Connections (ISO 228-1) …………………... Inlet – Return : G1/4
Nozzle port : G1/8
Pressure – vacuum gauge : G1/8
Weight ……………………………………….. A = 720 g AD = 600 g
Standard factory settings ………………… Pressure setting: 10 ±0,3 bar
Standard coil: 230 VAC 50/60Hz
Standard cable set: 3 cores, 700 mm
5- Solenoid valve specifications (A type only)
Power absorbed .……………………………. 9 W
Voltage tolerance …………………………… -15% / +10%
Ambient temperature .……………………... 0°C / 60°C
Operating pressure ……………………….... 25 bar max.
Flow factor (VDI/VDE 2173) ……………….. 0,059 m3/h
Cut-off pressure …………………………….. 6 bar
Approval (EN ISO 23553-1) ……………….. DIN CERTCO Reg.-Nr. 5S102/09
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DELTA – TECHNICAL MANUAL
6- Diagrams
Nozzle capacity Power consumption
7- Overall dimensions
1 Pressure regulation 8 Pressure gauge
3 Shaft sealing 9 Nozzle port
4 By pass 10 Solenoid valve
5 Return 11 Cartridge filter
6 Suction
7 Vacuum gauge
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DELTA – TECHNICAL MANUAL
8- Bypass installation
To convert the A/AD fuel unit from the single pipe
version to the two pipe version, do the following:
1. Using a 6 mm Allen wrench, remove the 1/4" plug from
return port (Fig. 1).
2. Remove the 1/8" plug from vacuum port .
3. Using a 2.5 mm Allen wrench, insert and screw the
bypass plug in the vacuum gauge port (Fig. 2).
4. Screw back the 1/8" plug into vacuum port.
To convert the A/AD fuel unit from the two pipe version
to the single pipe version, do the following:
1. Remove the 1/8" plug from vacuum port .
2. Using a 2.5 mm Allen wrench, unscrew the bypass plug
from the vacuum gauge port (Fig. 2).
3. Screw back the 1/8" plug in the vacuum port
4. Insert and screw a 1/4" plug into the return port (Fig. 1).
WARNING
In the single pipe version, the air is bled through the
nozzle line, after the solenoid valve opening.
In the two pipe version the air is bled through the return
port. After conversion, the air must be bled manually,
through the pressure gauge.
Make sure that the bypass plug is not used in a single
pipe installation, because the fuel unit will not function
properly and damage to the pump and burner motor
could result.
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DELTA – TECHNICAL MANUAL
9- Installation and Maintenance 11- Nozzle Cut-Off Test (A type only)
1. Make sure that the bypass plug is not used in a single pipe Fuel oil is not compressible but air is. Air trapped in the nozzle
installation. line, anywhere between the fuel units nozzle port and the
2. Do not use fuel with additives to avoid the possible formation nozzle itself, will compress during burner operation. Following
over time of compounds which may deposit between the gear burner shutdown, any trapped compressed air will expand
teeth, thus obstructing them. displacing the oil in the nozzle line, forcing continued oil flow
3. After filling the tank, wait before starting the burner. This will through the nozzle that will, in effect, falsely appear to be poor
give any suspended impurities time to deposit on the bottom of fuel unit Cut-Off. This occurrence is particularly common with
the tank, thus avoiding the possibility that they might be sucked low flow rate nozzles used in conjunction with long air tubes.
into the pump. To verify positive nozzle Cut-Off after burner shutdown, do the
4. On initial commissioning a dry operation is foreseen for a following:
considerable length of time (for example, when there is a long
1. Remove the nozzle line and fitting from the nozzle port of the
suction line to bleed). To avoid damages inject some lubrication fuel unit and connect a 1/8" pressure gauge to the nozzle port
oil into the vacuum inlet.
(a gauge of 20 Bar or greater be used). It may be more
5. Care must be token when installing the pump not to force the convenient to use a gauge fitted out with an extension nipple or
pump shaft along its axis or laterally to avoid excessive wear on with a line and flare nut to connect directly to the fitting installed
the joint, noise and overloading the gears.
into the nozzle port. If any type of extension is used between
6. In the A type pump do not force the valve stem and do not the nozzle port and the gauge, it should be kept as short as
use it as lever. If…
