Final Checks; Control Settings - Hussmann Proto-Aire EZ Manual Del Usuario

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8. Momentarily turn ON compressor breaker #1 and verify correct pumping direction.
Check all compressors before switching any wires. If all compressors are rotating
backwards, change two legs at the unit field power connection terminals. For an
individual compressor, change the Legs on the load side of the compressor contactor.
9. Remove forced conditions.

Final Checks

Return Gas Superheat
Return gas superheat should be 20 to 30 °F on all units
Once system is up and running, it is the responsibility of the installer to see that all the final
adjustments are made so the Proto-Aire EZ delivers maximum temperature performance and
efficiency for the customer. These include:
• Thermostatic Expansion Valve superheat adjustment
• Electronic Pressure Regulator settings
• Defrost scheduling and timing
• Condenser flow balance
• High and low pressure controls
• Thermostat settings
• Adjustments to electronic controls
• Electronic oil level controls
• Change all suction and liquid filter / driers after 72 hours of run time.
• Thoroughly inspect all field piping while the equipment is running and add supports
where line vibration occurs.
• Be sure additional supports do not conflict with pipe expansion and contraction.
When merchandisers are completely stocked, check the operation of the system again.
At 90 days recheck the entire system, including all field wiring.

Control Settings

It is mandatory that the mechanical low-pressure controls be set in the field.
3090249_D
P/N
Caution
Never run the compressors in a vacuum as
this may quickly damage the compressors.
Proto-Aire EZ I/O Manual