CPS TEMP-SEEKER TM360C 소유자 매뉴얼 - 페이지 10
{카테고리_이름} CPS TEMP-SEEKER TM360C에 대한 소유자 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. CPS TEMP-SEEKER TM360C 20 페이지. Precision thermo-psychrometer multi-channel air conditioning humidity and temperature drop tester
AUTOMOTIVE AIR CONDITIONING
TEMPERATURE DIAGNOSTICS
When using the diagnostic flow charts (DFC) follow these procedures:
•
Ensure the vehicle is properly secured in "Park" and the "Parking Brake" is
properly applied.
•
If possible, have the vehicle exposed to sun-load.
•
Open all vehicle doors.
•
Ensure the engine is at operating temperature.
•
The engine should be operated at idle speed.
•
Set the blower speed to high.
•
Operate the AC system for at least five minutes in the MAX AC mode before taking
any measurements. (MAX Mode is typically: compressor on, air directed to the
face vents, fresh/recirc door in the recirculating mode, not the fresh air mode, and
blower on high. Some systems have a MAX mode, others don't any must be set
this way manually.)
•
Obtain the OEM's (Original Equipment Manufacturer's) spec charts for both
temps and pressures, for the vehicle you are servicing! These charts will show
both specific duct temperatures and system pressures, based upon ambient
temperature, and relative humidity levels. You will notice that today's vehicles, will
NEVER obtain duct temperatures possible on older vehicles of just a few decades
past.
For example, an OEM spec chart for a current R-134a system, with ambient temps
between 96-105+°F and a humidity level above 40%, shows duct temperature in
a properly functioning system will be no lower than 72°F. Placing a temperature
probe in a vent and condemning a system that is not reaching 38°F is NOT the
proper way to test a system. Referring to the vehicle's dedicated specification
charts is a must, for proper AC system service.
•
Measure air temperature from the duct closest to the evaporator and compare
your reading to the OEM temperature performance chart, noting ambient air temp
and humidity level.
•
Measure the temperature drop across the condenser from the condenser inlet
pipe to the condenser outlet pipe, as close to the condenser as possible. Refer
to the Condenser DFC-A (Diagnostic Flow Chart A) in the appendix and follow its
recommendations.
•
Measure the temperature drop between ambient air and the discharge duct closest
to the evaporator and follow the recommendations of DFC-B, in the appendix.
•
Measure the temperature drop between the evaporator inlet (downstream or after
the refrigerant metering device) and outlet pipes and follow the recommendations
of DFC-C, in the appendix.
10