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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
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
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.
CHECKING FOR BLOCKAGE IN AIR-TO-AIR EVAPORATORS OR CONDENSERS
1. Remove panels to gain access to coil return bends or hairpins.
2. Press SET and then press / to select relatively high emissivity for copper tube.
3. Start the refrigeration system.
4. Aim the Thermometer at coil turn bends/hairpins.
5. Start recording temperature.
6. Take temperature of each return bend/hairpin.
- All evaporator return bends/hairpins should be at or slightly above evaporator saturation
temperature from the pressure/temperature chart.
- All condenser return bend/hairpins should be at or slightly less than condenser saturation
temperature.
- If a group of return bends/hairpins do not conform to expected temperatures, that indicates
a blocked or restricted distributor or distributor tube.
CHANGING THE BATTERY
To install or change the 9V battery, open the battery compartment the battery as shown in
Figure 2.
30
/
to select relatively high emissivity.
/
to select relatively high emissivity.
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