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Drawing or process description
A boundary drawing covering compressor, oil system, controls, heat rejection, evaporators and interconnecting refrigerant piping. Assign responsibility for each instrument and control signal at those boundaries so PLC interface points are not assumed.
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Operating conditions
Refrigerant, evaporating and condensing conditions, cooling or heating duty in kW, duty cycle, three-phase supply, cooling water or condenser air, footprint and work envelope. State whether the published number is capacity or swept volume in m³/h.
If evaporation or condensation conditions are missing, we still circulate the inquiry, but we mark capacity as unmatched until each factory restates the same point. Continue with the temperature-duty article.