COMBUSTION AIR ADJUSTMENT
(EM 40/2-E, EM 40/M-E)
The air shutter is operated by a gearmotor. To adjust
the closed/open and first stage/max. aperture positions
act on the cams by turning them anticlockwise to incre-
ase the air shutter opening and clockwise to decrease
the air shutter opening.
Blue cam
Total closing position
Orange cam
First stage start adjustment
Red cam
Second stage start adjustment
Black cam
Second stage VE2 opening go-ahead
MULTIBLOC MB-ZRDLE ..../B01 VALVE
ADJUSTMENT
1 1st/2nd stage delivery adjustment lock screw
2 Stabilizer adjustment
3 Protective cover for initial fast-start adjustment device
4 2nd stage delivery adjustment
5 1st stage delivery adjustment
To adjust the 1
/2
stage delivery loosen screw 1.
st
nd
Turning 4 and 5 anticlockwise increases the delivery.
Turning clockwise reduces the delivery. Once you have
carried out the necessary adjustments re-tighten screw
1. To adjust the initial fast-start mechanism remove the cover 3 and, using the rear of the
cover as a tool, rotate the pin.
GAS VALVE ADJUSTMENT
The maximum delivery and the start up delivery must
be set.
MAXIMUM DELIVERY ADJUSTMENT
- Assemble a gauge to measure the gas pressure at
the burner head.
- Open the gas valve to the maximum.
- While the burner is working, act on the stabilizer until
the required delivery is reached (read the meter):
read the pressure value on the gauge.
- Act on the valve adjustment by turning the valve
towards off until the pressure on the gauge just hints
at decreasing. At this point the maximum delivery re-
quired is set and controlled by both the stabilizer and
the gas valve.
Red
Blue
Orange
Black
Servo control
41
Gauge
UK