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Detailed Component
Maintenance Procedures
hCore
®
Heat Transfer
Technology
EC Fan System
DANGER:
Rotating equipment
will cause severe personal injury
or death to persons who come in
contact. Do not perform any service,
maintenance, or inspection on or
near the fan(s), motor(s), or inside
the unit without first ensuring
that the fans and pump motors
are disconnected, locked out, and
tagged out.
EC Fan System
The Electronically Commutated (EC) Fan System includes a direct-drive radial fan and a
variable-speed EC motor.
NOTICE:
If noise or vibration
persists, shut the unit down
and correct the cause before
continuing operation.
Figure 14.
Swing-Out EC Fan System
• Quarterly, check for vibration and tighten external fasteners as necessary.
• For internal access to the EC Fan System, remove bolts as shown highlighted below.
• Correct any excessive noise or vibration, which is an indication of one or more of the
following:
– Misalignment
– Imbalance of the fan
– Operation at resonant frequency
Figure 15.
Swing-Out EC Fan System
WARNING:
If the fan guard is
removed during servicing, it must
be reinstalled before the unit is
energized.
• To drain the hCore
®
Heat Transfer Technology on models without a crossover pipe,
drain the system piping as necessary to remove fluid from the hCore® Heat Transfer
Technology using a centrally located drain valve.