VACUUBRAND MZ 2C NT +AK+M+D - Manual (Page 52)

page 52 of 74
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Please read section ”Replacing diaphragms and valves” com-
pletely before starting maintenance.
The pictures may show other versions of pumps. This does not change
the method of replacing diaphragms and valves.
➨
Never operate the pump if covers or other parts of
the pump are disassembled.
➨
Before starting maintenance, disconnect the electri-
cal power cord. Wait five seconds after isolating the
equipment from AC power to allow the capacitors to
discharge.
➨
Ensure that the pump cannot be operated accidentally.
➨
Note: The pump might be contaminated with the pro-
cess chemicals that have been pumped during opera-
tion. Ensure that the pump is decontaminated before
maintenance.
➨
Avoid the release of pollutants.
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Never operate a defective or damaged pump.
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Take adequate precautions to protect people from the
effects of dangerous substances that may have con-
taminated the pump and may be released upon dis-
assembly. Ensure that the maintenance technician is
familiar with the safety procedures which relate to the
products processed by the pumping system.
Use appropriate protective clothing, safety goggles
and protective gloves.
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Check every motor capacitor regularly by measuring
its capacity and estimating its service life. Replace old
capacitors early enough to prevent a failure. The ca-
pacitors must be replaced by a trained electrician.
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Allow sufficient cooling of the pump before starting
maintenance. Drain condensate, if applicable.
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Vent the pump and isolate it from the vacuum sys-
tem before you start maintenance.
Replacing diaphragms and valves