Specifications

4
ViSSion® 20/20 Retrofi t Instructions • 35391SCRF
2.0 Vission 20/20 Retrofi t Instructions
This procedure defi nes the steps required to replace a Vilter Keypad Microcontroller with the Vission
20/20 Microcontroller.
2.1 Removal
Step 1. Safely shutdown and de-energize the compressor unit (1) and keypad microcontroller (2) adhering to
safe practices including lock-out/tag-out procedures.
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Figure 1. VSS Compressor Unit with Keypad Microprocessor
Step 2. Disconnect wiring from transducers.
WARNING
When handling microcontroller, use additional
personnel or lifting device as required. Failure to
comply may result in serious injury and/or damage to
equipment.
Step 3. With additional personnel or lifting device, remove hardware securing keypad microcontroller (2) to
rails (4). Remove keypad mirocontroller.
NOTE
Some compressor units are equipped with transducers and RTDs, if equipped,
continue to step 3. If not, continue to installation.
Step 4. Disconnect all associated pressure and temperature sensors from compressor unit (1) and existing
block and bleed assembly (3), if present.
Step 5. Remove the existing block and bleed assembly (3), if present.