Application Note

3. Motors and generators
Overheating and malfunctioning motors and generators
typically indicate mechanical or electrical inefficiencies
that contribute to energy waste and sometimes failure.
What to scan:
• Airflow. In fan-cooled motors, restricted airflow can cause
overheating, which can manifest on the entire housing.
• Electrical unbalance. Look for load imbalance and single
phasing which can contribute to unexpected loss.
• Bearings. Thermal imagers can reveal bearing housings
with abnormally high temperatures.
• Winding Insulation. Look for higher than normal housing
temperatures in areas associated with windings.
• Electrical connections. Look for loose or corroded
connections that increase resistance and contribute to
I2R losses.
4. Steam heating systems
Steam systems are more common in industrial facilities
than commercial settings, but some commercial buildings
still use them for central heating.
What to scan:
• Steam traps. Check traps for proper operation through
complete cycle.
• Radiator coils. Check for obvious steam leaks in radiators
and at all visible pipe and joint connections.
• Steam lines and valves. Look for leaks, blockages and blow-
by at valves that are supposed to be “closed.”
• Condensers. Look for outside air leakage, which reduces the
condenser’s vacuum performance and energy efficiency.
Did you know?
If a medium-sized trap fails open
in a 100-psig steam system, it will
waste about $3,000 per year.
Did you know?
If a medium-sized trap fails open
in a 100-psig steam system, it will
waste about $3,000 per year.