VACUUBRAND MZ 2C NT VARIO without controller (o.C.) - Manual (Page 67)

page 67 of 76
➨
Loosely screw in the Allen head screws (R)
of the housing cover in a start pattern with a
5 mm wide Allen key, then tighten.
+
Recommended torque: 8.9 ft . lb
f
(12 Nm).
Check the performance by measuring the vacuum at the inlet port of the
individual pump head:
Use a suitable vacuum gauge (e.g., DVR 2, cat. no.: 682902), being sure
that it is correctly calibrated. Measure the vacuum at the inlet port (marked
”IN”). A vacuum of less than 120 mbar should be achieved.
+
If the reading is higher, recheck the pump chamber and make sure
that the valves and the diaphragms are correctly seated (diaphragms
concentric with bore).
Individual performance check of a pump head:
Replace diaphragms and valves of all eight pump heads
in the same way.
R
Replacing the valve at the distributor (outlet side)
➨
Unscrew the two countersunk head screws
(M) at the manifold cover with an Phillips
screw driver. Remove cover plate and man-
ifold cover.
➨
Loosen the union nut of the hose running directly to the manifold cover
(L) of the distributor (P) with an open-ended wrench (w/f) 17. Loosen
only the union nut at the pump head, not the one at the distributor.
➨
Turn the fitting (Q) with an open-ended wrench (w/f 14) to detach the
hose from the pump head (1/4 of a turn at maximum).
+
Do not remove the elbow fitting from the pump head; during reassem-
bly a leak may result.
M