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Watson-Marlow 620DuN and 620Du User Manual 88
29.5 620RE, 620RE4 and 620R
general operation
Opening the pumphead guard
Unlock the guard with the 5mm Allen key provided (or a screwdriver).
Open the guard to its full extent. This creates the maximum clearance between
the tube ports and guard to remove the tubing.
Engaging/disengaging the rollers
The extent of travel of the roller release levers is clear from pictures 2 and 3
above. Do not try and force the levers beyond their normal extent of travel as
this will damage the rotor.
To engage the rollers snap the roller release levers counter-clockwise making
sure that the rollers lock out against the tubing. To disengage the rollers, snap
the release levers clockwise to their disengaged position. For high pressure tub-
ing elements or four roller pumpheads, a 5mm Allen key can be used to aid
leverage when engaging/disengaging the rollers with the release levers.
Pre-load checks
Before loading tubing, ensure that all rollers rotate freely, that the tube ports
and location grooves are clean and that if in use, the controlled waste pipe
work is free of any obstructions.
Closing the pumphead guard and start-up
Ensure that the guard seal is clean, replacing it if necessary.
Ensure that the rollers are engaged and locked out against the tubing
Close the guard and push it against the track until the latch engages.
Connect suitable pipe work to the pumphead using the appropriate connectors
for the tube element. See below.
Make sure that fingers are clear of the rollers
and the front face of the rotor hub when using
the roller release levers.
Always isolate the pump from the mains power
supply before opening the guard or performing
any positioning, removal or maintenance.