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3.2.3 Installation requirements
Prior to starting the chiller’s electrical installation, certain requirements should be checked. Input power wire sizes,
branch circuit protection, and control wiring are all areas that need to be evaluated.
Conduit Entry Size — It is important to determine the size of the conduit openings in the enclosure power entry
plate so that the wire planned for a specific entry point will fit through the opening. Do NOT punch holes or drill into
the top surface of any panels. Knockouts are provided on the enclosure. The VFD entry plate is designed to be
removed before any holes are made to prevent particulate from entering the cabinet.
Recommended Control and Signal Wire Sizes — The recommended minimum size wire to connect I/0 signals to
the control terminal blocks is 0.75 mm2.
Recommended Airflow Clearances — Be sure there is adequate clearance for air circulation around the enclosure.
152.4 mm minimum clearance is required wherever vents are located in an enclosure.
Service Clearances — Verify that there are adequate service clearances as identified in Fig. 15.
Match Power Module Input and Supply Power Ratings — It is important to verify that building power will meet the
input power requirements of the Machine Electrical Data nameplate input power rating. Be sure the input power to
the chiller corresponds to the chiller’s nameplate voltage, current, and frequency and to the design data sheet
provided by the equipment salesman. Verify all electrical inputs against design data sheets.
Fig 15 – 19DV overhead service clearance
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