APPENDIX - COMPONENTS CHARACTERISTICS
27
SUNTEC PUMPS AS 47 - 57 - 67
Operating principle
The gear set draws oil from the tank through the built-in filter and transfers it to the valve that regulates the oil pressure to the nozzle line. All oil
that does not go through the nozzle line will be dumped through the valve back to the return line in two pipe installation or, if it is a one-pipe
installation, back to suction port in the gear set . In that case, the by-pass plug must be removed from the return port, and the return port sealed
by steel plug and washer. The solenoid valve of the AS pump is of the "normally opened" type. When the solenoid valve is non-activated, the by-
pass channel between the pressure and return sides of the valve is open. No pressure will then be built up to open the valve; it does not matter
which speed the gear set has. When the solenoid is activated, this by-pass channel is closed and because of the full speed of the gear set, the
pressure necessary to open the valve will be built up very rapidly, which gives a very sharp cut-on function.
Cut-off
When the burner stops, the solenoid opens the by-pass at the same moment, which drains all the oil down to the return, and the nozzle valve
closes immediately. This gives a very sharp cut-off function. The cut-on and cut-off can be actuated regardless of motor speed and have an
extremely fast response. When the solenoid is not activated, the torque requirement is low up to full motor speed.
Bleed
Bleeding in two pipe operation is automatic, but it may be accelerated by opening a pressure port. In one pipe operation, a pressure port must
be opened to bleed the system.
Technical data
Mounting: flange or hub mounting according to EN 225.
Connection: threads cylindrical according to ISO 228/1.
Inlet and return
G 1/4 (with facilities for conical sealing
on revision 5 models)
Nozzle outlet
G 1/8
Pressure gauge ports
G 1/8
Vacuum gauge port
G 1/8
Valve function
Pressure regulation and cut-off*.
* cut-off function only assured for model pressure range.
Strainer open area
14 cm
2
- opening size: 150 µm.
Shaft: Ø 8 mm according to European standard EN 225.
By-pass pluginserted in return port for two-pipe system; to be removed
with a 4 mm Allen key for one pipe system.
Weight
1,1- 1,5 kg (depending on the model).
Hydraulic Data
Gear size: Nozzle pressure range * Factory setting
47/57 7- 14 bar 9 bar; 67 10 - 15 bars 10 bar
* other ranges available on request, refer to the specified range of the
particular fuel unit.
Operating viscosity
2 - 12 mm²/s (cSt)
Oil temperature
0 - 60°C in the pump.
Inlet pressure
2 bar max.
Return pressure
2 bar max.
Suction height: 0,45 bar max. vacuum to prevent air separation from oil.
Rated speed: 3600 rpm max. (AS 47, AS 57*) - 2850 rpm max (AS 67)
* except for AS 57 with code date before 000101 (pumps manufactured
before Jan. 1st , 2000) = 2850 rpm max.
Torque (@ 45 rpm)
0,10 N.m (AS 47/57) - 0,12 N.m (AS67)
Solenoid valve characteristics
Voltage
220-240 or 110-120 or 24 V; 50/60 Hz.
Consumption
9 V.A (@ voltage = 220 or 110 or 24 V).
Ambient temperature
0 - 60°C
Maximum pressure
15 bar
Certified TÜV Nr.
stamped on pump body.
Protection class
IP 41 according to IEC 529, when used
with SUNTEC connector cable.
Twin pipe installation
Single pipe installation
A
Closed solenoid valve
B
Open solenoid valve (NO)
C
Closed return
1
Solenoid valve
2
Pressure regulating valve
3
Pressure adjustment
4
To nozzle
5
Pressure gauge port
6
Escape valve
7
Shaft seal
8
Vacuum gauge port
9
By-pass plug "P"
10
Gear set
11
Inlet
12
Return
13
Back to suction
14
From gear set
15
To shaft seal and return
X
Oil under suction
Y
Oil under pressure
Z
By-passed oil returned to tank or to suction
