Fresenius Medical Care 2008K Troubleshooting Manual page 143

Figure 59 – Hydraulics Top View / Central Check Valves
CO- 4.6.0 ISOLATE THE CHECK VALVES
Referring to the Figure (right), check valves must be oriented properly If
accidently reversed they block flow. Arrows (
their direction of flow:
Remove the check valve's INPUT tubing and attach a syringe, with tubing attached, to the empty nozzle.
Are you able to push through the check valve(s)?
Yes CAREULLY reinstall the check valve(s) (ASSURE correct ORIENTION) then see procedure
number CO- 4.7.0
perform Heat Disinfect twice to 'break in' their tension springs.
No The check valve(s) are oriented incorrectly or are bad.
CO- 4.7.0 ISOLATE THE CONCENTRATE PUMP(S)
a) Referring to the Figure (right). Three checks:
1. Assure the nozzles are installed correctly per the arrows ( ) on the
mounting plate. Colored nozzle at the 'output' ( ) port; White
nozzles at the 'input' ( ) port.
2. Assure the input (clear tubing) and output (solid tubing) is plumbed
to the appropriate nozzles.
3. Assure the pumps are installed with the output (colored) nozzles
towards the TOP of the machine.
b) Referring to the Figure (right) disassemble the pump (see
page 141. Six checks:
1. Check for broken or bent inlet/outlet springs.
2. Assure the springs and seals are oriented correctly.
3. Check or replace the seals and o-rings.
4. If the machine is OLC equipped assure that a 'strong' spring is not
installed. BOTH springs should be 'weak'.
5. Check for a torn diaphragm.
6. If a problem is not found, three possibilities: 1) Bad 6 psi check valve (if equipped, see
page 141); 2) Bad pump); 3) Bad actuator board.
) on the red body indicate
(page 141). NOTE: If a (white inserted) check valve was recently installed
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
Section 5 – Conductivity/ On Line Clearance Problems
Figure 59,
Figure 59,
Page 141