22
Mixing cartridge removal:
•
Pull the plug of the flame detector. Pull the plug of the oil pre heater. Pull the two plugs of the ignition cable from the
ignition transformer. The mixing cartridge is no longer connected to the burner.
•
Loosen the mounting screws of the mixing cartridge. Due to the bayonet-mount it is not needed to remove the
screws completely.
•
Turn the mixing cartridge slightly to the left.
•
Pull the mixing cartridge towards you and out of the burner.
Ignition electrodes
Light tube end piece
(Not applicable for the Micro variant)
Mixing device
Oil preheater
Ignition cable
Electrode gap 5 mm
mixing cartridge control
Note:
Only take the oil nozzle out of the packaging directly before inserting it!
The nozzle could otherwise be damaged.
Locking screw
Oil preheater
Oil nozzle
Item No.
MH 10 / 17
0.30/60° SCD
022380
MH 15 / 23
0.35/60° SCD
022378
MH 30 / 40
0.65/60° SCD
022377
MH 10 micro
0.18/80° SCD
022379
MH 20 micro L
0.30/60° SCD
022380
Oil pump motor
Item No.
MH 10/17
0155517
MH 15/23
0155518
MH 30/40
0155515
MH 10 micro
0155550
MH 20 micro L
0155551
Mixing cartridge control:
1.
Check glass of the
flame detector tube
at the front end. Through this glass the flame detector monitors the con-
dition of the burner flame. Clean the glass surface with burner cleaner and a soft cloth, if needed.
2.
Check the
ignition electrodes
. If these are burned or not anymore properly placed in their holder replaced them
with genuine SCHEER ignition electrodes.
3.
Check for the correct distance of the ignition electrodes. The
distance between the two ignition eletrodes
must be 5 mm
. If the distance is greater or smaller than specified, they have to be replaced with genuine SCHEER
ignition electrodes. (Do not bend the used electrodes they could break! Unused electrodes can slightly be bend to
the correct distance.)
4.
Check the
oil nozzle
. If the nozzle is damaged or deposits are present, it must be replaced. How to replace the
nozzle is described in the next section.
5.
Reinstall of the mixing cartridge in the reverse order of its removal.
Replace the oil nozzle in the following steps:
1.
Loosen the set screw of the mixing device. Pull off the mixing device from the oil pre heater. The oil nozzle is now ex-
posed.
2.
Loosen the old oil nozzle with a 16 mm box-end wrench while holding the oil pre heater with a 16 mm open-end wrench.
Do not use an open ended wrench for the nozzle to avoid damage.
3.
Take the new nozzle out of the package. Hold the nozzle only by the sides of its hexagon and screw it by hand.
4.
Hand tighten the oil nozzle with a 16 mm box-end wrench while holding the oil pre heater with a 16 mm open-end
wrench. Do not use excessive force or an open-end wrench to avoid damage to the nozzles hexagon.
5.
Slide the mixing device back over the oil pre heater. The oil nozzles and the air bushing must be at the same height level. Use
a plane non-metal surface to align the position of the nozzle with the height of the air bushing. Do not use a metal surface
to avoid damage to the nozzle.
If the oil nozzle is not on the same level with the air bushing the burner will not work
correctly.
6.
Make sure that the light detector tube and the flame detector are in line with each other. An axial
rotation will lead to no flame detection and malfunction shut down.
7.
Now hand-tight the set screw of the mixing device. Do not use excessive force! Too much force will
deform the surface of the nozzle holder and an exact positioning of the mixing device is no longer
possible.
8.
Remount the mixing cartridge in the reverse order.
Summary of Contents for 077480
Page 31: ......
