38
Mechanical and electrical design
53
1159
Drain valve
Description
The drain valve is operated by using the pressure
in the cold water intake. A tube (1) is connected
between the cold water intake and a solenoid
valve (2). When the solenoid valve is activated, it
opens and allows water to flow into the feeder
tube (3).The water presses up a piston (4), which
uses the pressure lid (5) to close the drain valve
rubber membrane. When the solenoid valve cuts
out, the water presure push the piston back,
allowing the water to pass the solenoid valve and
drain out via the return tube (7).
Trouble shooting
If the drain valve doesn’t close:
• Check that the solenoid valve (2) receives
electricity.
• Check that the solenoid valve and the tubes
are clear by:
- removing the drain hose (3).
- Check that water exits the hose when the
valve is activated.
• Check that the diaphragm (8) is undamaged.
If the drain valve doesn’t open:
• Check that the return tube (7) is open.
• Check that the piston (4) doesn’t seize.
1
2
3
4
5
6
7
8
Fig.
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