Fuel-Oil Hydraulic Block - elco EKEVO N6.2400 GL-E Original Operating Instructions

Commissioning

Fuel-oil hydraulic block

N6... N9 GL-E
EKEVO6... 9 GL-E
1a Fuel-oil manometer, supply
(optional) (not shown)
1b Fuel-oil manometer, return
(optional) (not shown)
2 Supply safety valve
3 Return safety valve
4 Fuel-oil pressure switch min.
(supply)
5 Fuel-oil pressure switch, max.
(return)
6 Oil flow regulator servo motor
The hydraulic block is an integrated
component which combines many fuel-
oil hydraulic tasks on burners.
It functions as a flow regulator for the oil
flow rate. In addition, the safety
components (safety shut-off valves and
fuel-oil pressure switch) are installed on
the compact hydraulic block. The
solenoid valves in the supply are servo-
assisted, whereas the return valves are
controlled directly. The valve coils are
electrically switched in series.
This prevents a valve from opening on
its own when one of the two coils is
faulty. When replacing the solenoid
valves during servicing, ensure that the
right valve type is fitted the right way
round.
When replacing the solenoid valves
during servicing, ensure that the right
valve type is fitted the right way round.
The solenoid valve in the supply line
(type 321 F 2523) must be fitted so that
the flow direction punched on the valve
flange is the same as the flow direction
of the oil (from the pump to the nozzle
rods). For the solenoid valve in the
return, (type 121 F 2523), the arrow
punched on the solenoid valve points in
the opposite direction to the flow
direction of the oil, which is flowing back
from the nozzle rods to the pump.
The volumetric flow control valve
integrated in the return consists of a
bushing, which is pressed into the fuel-
oil hydraulic block and secured against
twisting, and a control shaft. Thanks to
contours which have been worked into
the bushing and shaft accordingly, the
open passage cross-section for the
returning oil is changed by twisting and
the quantity of oil return is affected. For
adjusting the different fuel-oil nozzle
sizes, there are control shafts with
different control contour parameters,
which makes it possible to achieve
outstanding control characteristics and a
large control range for every application.
The control contour parameter and the
rotation direction (with the letter L) are
marked using an electrical stylus on the
control shaft. If the control shaft is
replaced, before refitting, check the
control contour parameter and the
rotation direction.
The current position of the control shaft
can be read from the position display.
Starting at "min." (lowest burner load),
the control shaft turns clockwise to the
"max." marking (full burner load). If the
control shaft is removed during
servicing, the installation position of the
control contour must be noted when
refitting the shaft. The position is marked
by a punch mark on the front of the shaft.
At the lowest load position ("min."), the
punch always faces upwards (9 o' clock
- see photo).
03/2016 - Art. Nr. 4200 1044 8002A 35