13
Checking for Blockage in Air-To-Air Evaporator 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.
OPERATING IR-750 / IR-750-EUR SOFTWARE
System Prerequisites
Recommended configuration
Processor
Pentium® 4 or higher with support of all customary operating systems
Operating system
Microsoft Windows® 2000 / XP / Vista / Win7
Memory
512 MB RAM or higher
Monitor
VGA (1024 x 768)
Drive
CD-ROM
Input device
Mouse or compatible
Interface
USB for data transmission
Install IR-750 / IR-750-EUR Software
• Insert the provided CD disk into CD-ROM drive.
• Double-click “IR-750_VX.XX.exe” (X can be 0 to 9 or blank,
indicating the software version)
• The pop-up windows will guide you through the program setup process.
Connecting USB cable to IR-750 / IR-750-EUR Thermometer
