Johnson Controls TopClean AS - Manual (Page 12)

10
IM-AS/02.00 GB (0412)
11.0 Disassembly and Assembly AS-series
11.1 General instructions
Assembly and disassembly may be preformed by qualified personnel only. Always wear
appropriate safety clothing. Make sure that personnel are instructed and educated.
Insufficient or wrong assembly and disassembly can lead to the pump malfunction.
Johnson Pump is not liable for accidents and/or damage caused by non-compliance with
the guidelines.
Always work in a clean surrounding. Keep all highly sensitive parts such as seals, O-
rings, bearings, etc. in their original packing as long as possible.
Use a clean work surface.
Check that the parts to be used have not been damaged during transport.
Never work on the pump in operation. In case of a disassembled pump, avoid any
contact with the impeller when turning the shaft manually.
Do not forget that the pump can be started even when the pump casing has been remo-
ved for e.g. cleaning. Never run the pump without the pump casing. Follow the
instructions for shutdown before performing any maintenance or service.
After disassembly carefully clean the parts and check them for damage, especially the
mounting surfaces, and replace all damaged parts.
All parts fitted together at the disassembly must stay together when reinstalled,
especially the impeller, shaft, shim and back plate.
11.2 O-rings and lip seals
When working with lip seals or O-rings, take care not to damage them as they pass over
sharp edges of splines, threads, etc. Be sure that the O-rings are not twisted in the groove
when installing.
All O-rings and sealing lips should be lubricated with a suitable lubricant before fitting,
e.g. soap and water or silicone spray.
For O-rings made of PTFE, it is advised to heat them up in hot water before placement.
A warmed up O-ring becomes softer, thus easier to install. Be aware of that PTFE has
no thermal memory.
11.3 Shutdown
Before starting the maintenance or inspection, follow the next steps to shut down the pump.
1. Stop the pump. To prevent the motor from starting while you are working on the
pump follow the procedure below:
• Turn off the pump at the electrical cabinet.
• Set the pump circuit breaker to off.
• Switch off and lock the operating switch.
• Remove the fuse.
• Sign the electrical cabinet “danger”.
2. Remove, if necessary, the protection around the shaft coupling when the pump
has stopped completely.
3. Let the pump cool down to ambient temperature.