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Installation and Operating Instructions
G
as burner WG20.../1-C ZM-LN (W-FM 25)
83055116 • 1/2016-05
8 Maintenance and service
8
.11 Removing and re-installing the gas butterfly valve stepping motor
Observe the notes on maintenance and servicing (see Ch. 8.1).
Removing
u Remove the stepping motor plug 1 from the combustion manager.
u Remove the screws 2.
u Remove the stepping motor.
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 1 at the combustion manager.
u Unplug the bridging plug No. 7 from the combustion manager.
u Switch on the power supply.
aThe combustion manager checks the stepping motor and drives it to the reference
point.
u Disconnect the power supply.
u Install the stepping motor rotated by approx. 15º.
u Install the screws 2 to the stepping motor.
u Plug in the bridging plug No. 7 in the combustion manager.
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