Watson-Marlow 521CC - Manual (Page 23)

13 520RC, 520R2C and 520REC installation
13.1 Opening the pumphead guard

Isolate the pump from the mains power supply.
 Unlock the pumphead guard by turning the guard fastener ¼ turn anticlockwise with a
flat-head screwdriver.

Open the guard to its full extent to create maximum clearance for the tube ports.

Ensure that the rollers rotate freely and that the tube clamps are clean.
13.2 520RC and 520R2C tube loading
520RC continuous tubing pumpheads are factory-set to accept Watson-Marlow 1.6mm-wall
tubing. 520R2C continuous tubing pumpheads for close-coupled drives are factory set to
accept Watson-Marlow 2.4mm-wall tubing. Pumping performance may be adversely
affected if Watson-Marlow tubing is not used.

Mark a 225mm length onto the section of the tubing which is to be located into the
pumphead.
 Open the lower spring-loaded tube clamp and locate tubing, with the first 225mm length
mark aligned to the inside face of the spring-loaded part of the tube clamp. Release the
clamp.

Disengage the rotor clutch by fully depressing the yellow clutch button on the side of the
rotor hub and turning the hub a few degrees while the clutch button is still depressed.
The rotor can now rotate independently of the gearbox and motor for one full revolution.
If the clutch re-engages before tube fitting is complete, depress the clutch button again
and turn the rotor a few degrees.
Page 23 of 47 Watson-Marlow Bredel E-Manuals
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