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l If outer circumference of sheave is at higher
temperature than sheave at motor shaft, then belt
is probably slipping and sheaves may be misaligned.
Checking Hydronic Radiant Heat Applications
Radiant heat tubes in the floor will normally run parallel
to the outside walls. Starting at the floor wall juncture,
scan parallel to the wall while moving into the room
away from the wall. Parallel to the outside wall you
should find parallel isothermal rows indicating the
location of heat tubes below the surface. Perpendicular
to the outside wall, you should find rising and falling
temperatures at equal distances. High temperatures
indicate you are scanning a heat tube beneath the floor
surface, low falling temperatures indicate a space
between the heat tubes.
1. Press SET and then press / to select relatively
high emissivity.
2. Press YELLOW button to select MAX.
3. To locate radiant heat tubes in floor, temporarily
elevate the loop temperature to create hotter spots
for identifying tubing runs.
4. Before releasing trigger, press YELLOW button to
toggle between MIN, MAX, DIF floor temperatures
and record the temperature for future comparison
and trending under similar conditions.
Measuring Grille, Register, or Diffuser Discharge
Temperature
1. Press SET and then press
/ to select relatively
high emissivity.
2. Aim the Thermometer at the discharge air grille,
register, or diffuser.
3. Measure discharge temperature.
4. Release trigger to freeze the temperature reading
for 8 seconds and record this temperature.
5. Grille, register, or diffuser temperature should be
equivalent to discharge temperature at the air handler.
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