Service Manual
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9.2 Electrical drain valve
The water pressure operated drain valve is standard and mostly used. This drain valve is using the incoming water
pressure to keep the drain valve closed.
Electric drain valve (below) is an option. This electric drain valve is used on installations/sites where the incoming
water pressure is low or too unstable to keep the drain valve closed. This electric drain valve has a built-in rubber flap
which is NO (Normally Open) by a return spring. The rubber flap is closed by an electric motor. This electric motor is
engaged (powered) when the drain valve is closed. The motor is available in 120 Volt AC or 230 Volt AC. Both var-
iants in 50/60 Hz.
fig.W00892