Use this structured HIU service check sheet to commission and verify Heat Interface Units in apartments and mixed-use buildings. Capture serial numbers, valve status, expansion vessel charge, thermostat settings, heat meter readings, primary and secondary flow and return temperatures, flow rates, pump model and speed, and zone valve operation. Record tap water temperatures including TMV limits, system pressures, and visual leak checks. This checklist helps engineers document equipment performance, ensure safe operation, and meet compliance and warranty requirements.
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