V/D
S
ERIES
M
ECHANICAL ASSEMBLIES
Revision: 2.1 3-75
3.11.2 Maintenance tasks
Checking the flow monitor
Check the flow monitor as detailed in chapter “3.8.3 Flow monitor”.
Checking water usage
Water volume:
− Speck pumps: 0.6 – 0.8 litres/min. at a pressure < 50 kPa
− Other pump manufacturers, e.g. Nash Elmo, Gardener Denver:
0.8 – 1.2 litres/min. at a pressure < 50 kPa
Current consumption:
− Devices ≥ 65 l: Approx. 1.8 – 2.9 A (depending on manufacturer)
− Devices up to 55 l: Approx. 1 A
The water volume is checked as follows:
• In the Service -> Manual output set menu, activate the
vacuum pump and leave the vacuum valve closed.
• Measure the water volume.
Checking the cavitation protection
The cavitation protection ensures that the water is not heated to boiling
point if the pressure of the cooling water falls.
Listen for noises – a loud screeching noise is emitted in the
event of a malfunction. Brief cavitation at the start of the drying
phase is normal.
Possible causes of errors:
− Faulty no-return valve
− Faulty needle valve
− Pump is scaled up
Descaling the pump
Necessary tools 5 mm Allen key
8 mm spanner
Have available Scale remover (e.g. Systec autoclave cleaner)
Dirt trap (sieve or filter)
Proceed as follows to identify scaling of the pump:
• Remove the pump cover – remove the four screws and remove the
cover from the pump housing.
• Open the pump head and check if any scale deposits are visible.
To Next Page
Loading...
