171 505 46 09-01
Two pipe installation
One pipe installation
Oil under
pressure
Oil under
suction
By-passed
oil returned
to tank,or
to suction
INSTRUCTIONS PUMP TYPE SUNTEC A2L 65C - 75C
Pump operating principle for
A2L 65C - 75C
The
SUNTEC A2L
oil pump has two
nozzle outlets. It incorporates two
blocking solenoid valves with in-line-
cut-off function, one for each nozzle
outlet.
The gear set draws oil from the tank
through the built-in filter and transfers
it to the nozzle line via the cut-off so-
lenoid valves. A pressure regulating
valve is used to dump all oil which is
not required at the nozzle.
In one-pipe operation, the oil which
does not go through the nozzle lines is
returned directly to the gear inlet and
the suction line flow is equal to the
sum of the 2 nozzle flows. In two-pipe
operation, the by-pass plug must be
fitted in the return port, which ensures
that the oil dumped by the regulating
valve is returned to the tank and the
suction line flow is equal to the gear
set capacity.
Bleed
Bleeding in two-pipe operation is au-
tomatic: it is assured by a bleed flat
on the piston. In one-pipe operation,
a high pressure connection must be
loosened until the air is evacuated
from the system.
Cut-Off
The solenoid valves of the A2L pump
are of the "normally closed" type and
are situated in the nozzle lines. This
design ensures extremely fast res-
ponse and the switching can be sel-
ected according to the burner opera-
ting sequence and is independant of
motor speed.
When the solenoids are non-activated,
the valves are closed and all oil
pressurised by the gear set passes
through the regulator to suction or to
the return line, depending upon pipe
arrangement.
As soon as the solenoids are activat-
ed, oil passes to the nozzle lines at
the pressure set by the pressure
regulating valve.
A2L
C
XX
Shaft rotation and nozzle
location seen from shaft end
Gear set capacity
A2L: 2 nozzle outlets
Exchange of filter
Mounting/dismounting return plug
One pipe system
Two pipe system
Solenoid valve 2 (NC) closed
Solenoid valve 2
(NC) open
Solenoid valve 1
(NC) open
To nozzle 2
To nozzle 1
Pressure
gauge port
Pressure
gauge port
Shaft seal
By-pass
plug
Return
Suction
By-pass plug
removed
Solenoid valve 1 (NC) closed
Gear set
Vacuum gauge port
Pressure adjustment
Return
plugged
Back to suction
