34 | 3 | 8911 | 2 |
Type | Edition | Page |
| Service |
34. Inlet Valve, Water | Manual |
Repair instruction
Valve operation gradually gets worse
Hot water with high lime content cause scale deposits in the balancing nozzle of the valve. Clean the nozzle as follows:
•Shut off the water.
•Unscrew the nozzle and clean it with a needle or similar. A nozzle marked with one ring around the head of the screw has a bore diameter of 0.5 mm and a nozzle with two rings has a bore diameter of 0.8 mm. The diameter of the needle used to clean the nozzle must not be greater than the bore diameter.
•
•Turn on the water, check operation and check for leaks.
•If this does not help, check that the inlet filter of the pilot channel is not blocked.
Where the water is very hard, i.e. contains a high lime content, it is recommended that the 0.5 mm nozzle should be replaced with a 0.8 mm nozzle.
Valve does not open
•Check for voltage at coil.
•Measure the resistance of the coil to check for short circuit or open circuit.
•Dismantle the valve and check that the armature is not binding. If necessary, clean to remove scale, particularly in the ducts of the valve between the top and bottom of the diaphragm.
•Remove the coil and clean the metal surfaces of the magnet core.
Valve does not close
•Check that there is no voltage across the coil. Normally the valve is closed when the coil is de- energised.
•Dismantle the valve and check the armature return spring and check that the armature is not binding. If necessary, remove limescale deposit, particularly in the ducts of the valve between the top and bottom of the diaphragm.
•Check the balancing nozzle in accordance with the instructions under the heading "Valve function gradually gets worse".
Needle
0369
Balancing nozzle | 1365 |
