Fresenius Medical Care 2008K Troubleshooting Manual page 61

F- 20.0.0 PRESSURE TEST HYDRO BLOCK/HYDRO CHAMBER
This procedure pressurizes the Hydro Block/Hydro Chamber:
a) Referring to the Figure (right), at the top of the Hydro Block/Hydro
Chamber, tie wrap the segment of vent tubing that is attached to the
float.
b) Referring to the Figure (below, right), place the 274
two-resistor OLC set, into the float's distribution position labeled
rd
"FLOAT-SW" (3 connector cap from the left). This simulates a
closed float switch and opens incoming water valve #41.
c) If the 274 plug is placed correctly vent tubing overflow occurs
within 30 seconds.
d) Clamp the vent tubing. This pressurizes the Block/Chamber to
approximately 20 psi (per incoming water regulator #61).
e) Check at the bottom and top of the Chamber/Block. Water leak
located?
Yes Proceed to page 214, procedure number
No a) Return the float to distribution board position "FLOAT-SW" and unclamp the vent tubing.
b) If an air lock returns perform Acid Clean two times. If a Flow Error occurs due to bad
loading pressure see part c.
c) Six possibilities: Old Style Hydro Block ONLY: 1) Bad restrictor o-rings or stripped
fitting. Old Style Hydro Block AND New Style Hydro Chamber: 2) Plugged restrictor
#48*; 3) Bad deaeration pump head; 4) Bad deaeration motor; 5) Bad float (see
28, page 59); 6) Bad loading pressure valve #65..
* Recurring debris may indicate: A) Old Style Hydro Block ONLY: 1) 'Rod baffle' degradation in
chamber E (see Figure
debris (if the restrictor o-rings are/were broken). B) New Style Hydro Chamber AND Old Style Hydro
Block: 1) Inadequate acid clean cycles (causing excessive bicarbonate precipitate); 2) Inadequately
filtered incoming water.
Figure 28 – Float Switch #5 and Chamber E Rod (in Old Style Hydro block ONLY)
28, page 59); 2) Excessive o-ring lubrication at the restrictor o-rings; 3) O-ring
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
Section 1 – Flow Errors In Dialysis Program
plug, from the
DAIR- 7.0.0.
Figure
Page 59