Hussmann Proto-Aire, Installation Manual

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Protocol™ Installation and
Service Manual
7. 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 field side of the convenience switch. For
individual compressor, change the Legs on the load side of the compressor
contactor.
8. Remove Forced Conditions
Final Checks
Return Gas Superheat
Return gas superheat should be 10 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 Protocol™ 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
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.
Caution
Never run the compressors in a vacuum as
this may quickly damage the compressors.
Control Settings
High Pressure Safety – 395 psig
Vacuum Pressure Safety – 0 psig
Discharge Temperature Sensor – 240 °F
It is mandatory that the mechanical low-pressure controls be set in the field
Electronic Oil Level Control
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