General Tips For Checking Leaks/Servicing HLD-100

- Both R-12 and R-134a are heavier than air, so always check 360 degrees around all fittings.

- If the system is very low on refrigerant, charge it to its normal capacity. (Some leaks are impossible to find unless the system is operating at normal pressures.)

- Refrigerant leaks are also oil leaks. The easiest way to spot a leak is to look for joints or components coated with oily dust. Check for damage and corrosion at the same time.

- When checking the service ports for leaks, be sure the cap seals are in place and the caps are tight. The cap is used as the final seal in the system, not just to keep dirt out of the schrader valve.

- Check the whole system in a continuous path; don't stop the first time the detector indicates a leak. Check all fittings, couplings, service ports, pressure switches, welded areas, and areas around attachment points on lines and components.

- When checking the crimped metal ends on a rubber hose, wiggle the hose around.

- Move the probe slowly (one inch per second is the recommended rate), and keep it within 1/4 inch of the components. Moving the probe even slower at closer proximities increase the likelihood of finding the leak.

- Check the low pressure side when the system is not running. Check the high pressure side when the system is running and also right after turning it off. (The air from the cooling fans may give you false alarms.) Since the compressor and the evaporator are in both sides of the system, check these components when the system is running and when it's off.

- Verify apparent leaks by blowing the area with compressed air, then recheck for leaks. In case of a very large leak, blowing out the area may help pinpoint the exact source of the leak.

Here are some servicing tips for the HLD-100. Refer to the Operator's Manual for detailed service procedures.

- Check and replace the probe filter if it is clogged. Be careful not to lose the flow ball when doing this.

- The reference calibration vial can be expected to last approximately 6 months. Replace it when it is empty.

- If the sensitivity adjustment dial does not calibrate the sensor, replace the sensor.