Marco Marco 1000680, Service Manual

Page: 21 / 43

21
Service manual April 2017 Uber boiler
3.3 UBER BOILER INTERNAL PLUMBING
Below is a picture of the top of the tank. The first tube on the left is the tank vent which
attaches to the driptray to vent out any steam.
The middle tube is the recirculation tube feeding back into the tank. You can see the position
of the ball valve handle on this tube. This is approximately the position to give a good flow
rate. If dispense flow is low and there does not appear to be a kink in the tubing, you could
try adjusting this ball valve for more or less dispense pressure from the font.
By moving the lever to the left (more inline with the pipe) it will open up the valve more. This
will result in more water returning to the tank and a lower flow rate from the font. It would
also allow foreign objects to pass through if there is debris in the tubes.
By pushing the lever downwards, it will close the valve. It should not be closed completely as
this would stop circulation in the system completely. It would, however, increase the flow rate
from the font.
The last tube on the right is the tube from the pump. The thermistor (thermometer) is in the
metal T-piece. This is the tube which could be pushed up or pulled down slightly to relieve
any kinks at the bottom.