VACUUBRAND PC 3001 VARIOpro emission condenser Peltronic - Manual (Page 105)

page 105 of 120
Replacing the diaphragm
➨
Remove the head cover (C) carefully from
the housing cover (A). Note position and
alignment of valves (B). Remove the valves.
+
Replace valves if necessary.
+
Use petroleum ether or other industrial sol-
vent to remove deposits. Do not inhale va-
pors.
+
Check diaphragms (E) for damage and re-
place if necessary.
➨
Lift diaphragm carefully sidewise.
+
Never use a pointed or sharp-edged tool to
lift the diaphragm. If necessary, press down
the diaphragm clamping disc of the adja-
cent pump head to raise the diaphragm into
its uppermost turning point position.
➨
Use the diaphragm key to grip the diaphragm
support disc (F) below the diaphragm.
➨
Press down the diaphragm clamping disc to bring the diaphragm into
its lower turning point position. Unscrew diaphragm support disc (F)
with diaphragm (E) and diaphragm clamping disc (D).
➨
Check for washers (G) between the diaphragm support disc (F) and
the connecting rod (H). Do not mix the washers from the different pump
heads, since these are set at the factory to ensure proper pump per-
formance. Make sure that the original number is reassembled at the
individual pump head.
+
Too few washers: The pump will not attain vacuum specification. Too
many washers: Diaphragm clamping disc will hit head cover, causing
noisy operation and possibly causing the pump to seize up.