Gree GWC09AA, Инструкция по установке и обслуживанию

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GREE Service Manual GWC09AA / K5NNA6A Page 88
Electronic Gas Detectors
Using an electronic gas detector is generally the fastest way to find an unknown
leak or at least if refrigerant is present in the surrounding area. They can be
used to quickly find a leak, or to find the area in which the leak exists in a
system when you don’t even know where to start.
The electronic gas detector is good for most leaks if the device is used and
maintained correctly.
Note: For the use with Hydrocarbon refrigerants (here HC R-290) it is im-
portant to make sure that the detector is safe and sensitive for this
refrigerant. Regularly used electronic gas detectors for CFC, HCFC or HFC
refrigerants are in most cases not designed for the use with HC R-290, so
check with your equipment provider and review the product manual if the
gas detector is safe for your specific use.
An electronic gas detector gets you very close to the leak spot and can indicate
leaks of less than 5 grams per year. After you find the area in which the leak is
detected, you can usually decrease the sensitivity of your detector to indicate
the area of the leak. Cover the leak area with some weak soap water solution to
verify the exact point of the leak.
Hints for the use of electronic leak detectors:
1. Check your device at least once a year to ensure reliability and accuracy.
Your equipment supplier can guide you on how to carry out calibration. In
most cases it is possible to use a “reference leak source” for calibration.
2. Know your gas detector’s capabilities and also what it is not capable of de-
tecting.
3. Carbon monoxide and alcohol can affect the sensitivity of most electronic
gas detectors. Be sure neither is present when checking for leaks.
4. For optimum leak detection, hold the sensor head as close as possible over
the refrigerant transferring pipe. Move the sensor head slowly along the
pipe with a maximum of 1 cm per second of speed.
5. Mechanical connections (screwed unions) or other connections must be
“scanned” slowly, move the sensor head right around the complete
connection point.
6. When the Gas Detector indicates a leak, it is advisable to hold the sensor
head away from the leakage site (spot) identified, for approximately 5 sec-
onds. Then check whether the device indicates a leak at the same spot
again. Repeat this procedure step-by-step three times. This will verify if a
leak really leak exists.
7. During other work activities with HCs (installation, service, maintenance)
place the Gas Detector on the floor of your work area and the device can
act as a HC Gas Warner!
The use of Gas
Detectors de-
signed for HC
Refrigerant is a
SAFETY issue!
Regular Gas De-
tectors may not
be safe for the
use with HCs!
Sensor Head
The HC gas de-
tector is part of
a Personal Pro-
tection Equip-
ment (PPE)
HC refrigerant
has a higher spe-
cific volume than
air, therefore the
refrigerants will
fall when
exposed to at-
mospheric pres-
sure.
This means leak
detecting on the
bottom sides of
the piping or
components
can be effective.
Example of a Gas Detector,
designed and safe for the
use with HC refrigerants