55
Installation and Operating Instructions
Gas burner WG20.../1-C ZM-LN (W-FM 25)
83055116 • 1/2016-05
8 Maintenance and service
8.9 Removing and re-installing the air damper stepping motor
Observe the notes on maintenance and servicing (see Ch. 8.1).
Removing
u
Remove the stepping motor plug
4
from the combustion manager.
u
Remove the screws
3
.
u
Remove the stepping motor and the shaft
2
.
Re-installing
Damage to the stepping motor caused by turning the shaft
The stepping motor could be damaged.
u
Do not turn the shaft manually or with tools.
u
Plug in the stepping motor plug
4
at the combustion manager.
u
Unplug the bridging plug No. 7 from the combustion manager.
u
Switch on the power supply.
a
The combustion manager checks the stepping motor and drives it to the reference
point.
u
Disconnect the power supply.
u
Install shaft
2
to the stepping motor.
u
Set the indicator
1
on angle drive to 0 (air damper CLOSED) and hold.
u
Install the shaft with stepping motor to the angle drive.
u
Install the screws
3
to the stepping motor.
u
Plug in the bridging plug No. 7 in the combustion manager.
CAUTION
2
3
1
4
