9 Repair
NGW 300 / LGW 300 / GBW 300
906
9.2.3 Replacing the SG 1585 control unit
ATTENTION
Replacement of the control unit must be done in an unen-
ergised state.
Ignition must be switched off The sequence of procedures
must be followed absolutely so that no fault entries are
made in the control unit and conditionally upon that, as the
case my be, locking the heater is avoided.
(Fault entries are caused at the control unit by open inlets
and outlets among other things.)
9.2.3.1 Dismantling
1. Ensure that the heating system is switched off.
Where necessary, switch off the heating system by
activating the main switch, the timer or the
airconditioning system and wait until it stops running.
2. Disconnect all electrical lines to the control unit (2, fig.
905).
3. Pull the control unit out of the guide slot of the burner’s
protective hood (1) and remove it.
4. Implement the measures for components when the
system is disassembled (see 9.1.1).
9.2.3.2 Extension
1. Slide the control unit (2, fig. 905) with a plug downwards
into the guiding slot of the burner’s protective cap (1) ntil
it snaps into place in the locking groove.
2. Re-establish all electrical connections to the control
unit (2).
Fig. 905 Replacing the SG 1585 control unit
9.2.4 Replacing the ignition spark generator
PLEASE NOTE
The ignition spark generator must be replaced complete
with electrical connections to the ignition electrodes.
9.2.4.1 Dismantling
1. 1.Dismount the burner head (see 8.5.1.1).
2. Dismount the ignition electrodes (see 9.2.5.1) and
remove the rubber sleeves from the electrical connections
to the ignition spark generator.
3. Pull the electrical connections (3, fig. 906) with the
rubber sleeves out of the casing.
4. Remove the fillister head screws (2).
5. Take the ignition spark generator (1) off the hood.
6. Disconnect the electrical lines (4).
7. Remove the ignition spark generator (1).
8. Implement the measures for components when the
system is disassembled (see 9.1.1).
9.2.4.2 Extension
1. Guide
electrical
connections (3, fig. 906) through the
casing and press the rubber sleeves until they are
flush with the casing.
2. Establish electrical connections (4) to the ignition
spark generator.(1).
3. Bring the ignition spark generator (1) into the assembly
position and attach with fillister head screws (2).
4. Slide the rubber sleeves on the electrical connections
onto the ignition spark generator and install the
ignition electrodes (see 9.2.5.2).
5. Mount the burner head (see 8.5.1.2).
Fig. 906 Replacing the ignition spark generator
1
2
1 Protective burner hood
2 2SG 1585 control unit
2
3
4
1 Ignition spark generator
2 Fillister head screw (4)
3 Electrical connection, ignition electrodes (2)
4 Electrical connection, ignition spark generator (2)
1