72-820 TENMA, 72-820 Datasheet - Page 20

• Manufacturer Part Number: 72-820
• Description: INFRARED THERMOMETER, 18°C TO 550°C
• Manufacturer: TENMA

Specifications of 72-820

• Temperature Measuring Range: 18°C To 550°C
• Temperature Tester Type: Thermometer - Infrared
• Accuracy %: 1.8%
• Wavelength Max: 670mm

Turn on the blower (no heat, no cooling) and retest. If
test results with the blower on are different than results
with the blower off, this may indicate air leaks in
conditioned envelope walls. The air leaks are caused
by duct leaks that create a pressure differential across
the conditioned space envelope.
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To avoid injury when testing bearings:
Do not wear loose clothing, jewelry, or anything
around neck when working around moving parts
such as motors, belts, blower, and fans.
Make sure an electrical disconnect is within
reach and operating correctly and freely.
Do not work alone.
Warning
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Press SET and then press
high emissivity.
Press MODE to select MAX.
Enable motor and allow it to reach steady state
operating temperatures.
Disable the motor if possible.
Measure the two motor bearing temperatures
Compare the two motor bearing temperatures.
Unequal temperatures or a high temperature can
indicate a lubrication or other bearing problem that
is resulting from excess friction.
Repeat the sequence for the blower bearings.
Model 72-820: OPERATING MANUAL
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to select relatively