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CHAPTER 3: INSTALLATION
11
Using the Step-Down Transformer
• Connect the Step-Down Transformer to a UPS for continuous power during a utility
power failure.
• The transformer has an efficiency of 90%. This requires 5500 VA for a 5000 VA load, 5000 VA
for a 4500 VA load, and 3900 VA for a 3500 VA load. Be careful not to overload your branch
circuit or UPS.
• For the AP9621, SYTF2, and SURT005 models to output the full 5000 VA, the input must be
hardwired to a 5500 VA source.
• Operating the Step-Down Transformer below its specified input voltage range may cause it
to overload and shut down to prevent it from over-heating. When connecting directly to a
branch circuit, ensure that the line voltage is within specification. When connecting to a UPS,
ensure that the line voltage into the UPS is within specification before transferring to bypass.
• Operating the Step-Down Transformer above its input voltage range may cause equipment
damage.