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26-5
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SERVICE- HVAC SYSTEM
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1.2 A/C SYSTEM SERVICING:
1.2.1 Service Safety
Ÿ
Servicing of an air conditioning system should be conducted by a qualified A/C technician.
Ÿ
In servicing HVAC systems you will be exposed to high pressures, temperatures and several
chemical hazards. Moving belts and pulleys are normal shop hazards.
Ÿ
Always wear safety goggles or a face shield when you are using refrigerant or a leak detector,
adjusting service valves or the manifold gauge set connectors
Ÿ
Refrigerant inside a container and in parts of the A/C system is a liquid under pressures. When
refrigerant escapes or is released to the air, its temperature drops instantly (R-134a is -16°F). If it
spills on your skin or in your eyes, flood the area with cool water and seek medical attention.
Ÿ
The compressor creates pressure when it runs. If pressures get too high in the system, the weakest
point may separate or blow out. A system restriction, too much refrigerant, or improper charging
procedures are all potentially dangerous.
Ÿ
Do not grab hold of a clutching fan to stop it when it is disengaged but turning at low RPM, serious
injury may occur.
Ÿ
Never use compressed air to leak test or pressure test an R134a system. Under certain conditions,
pressurized mixtures of R134a and air can be combustible. In addition, shop air injects moisture into
the system.
Ÿ
Be sure the area you are working in has plenty of ventilation and that no other gasses or fumes are
present.
Fire or explosion hazards exist under certain conditions with R134a. A
combustible mixture can form when air pressures are above atmospheric
pressure, and a mixture of air and R134a exist. For this reason do not
pressure test air conditioning systems with compressed air.
UNLESS OTHERWISE NOTED, ALWAYS USE
R134a REFRIGERANT IN BARKO A/C SYSTEMS
WARNING
!
NOTICE
1.2.2 Recommended Tools
Ÿ
Safety glasses and work gloves.
Ÿ
Thermometer
Ÿ
R134a Refrigerant
Ÿ
Compressor oil (if needed) of proper type
Ÿ
Mineral oil to lubricate o-rings
Ÿ
Manifold Gauge Set
Ÿ
Vacuum Pump
Ÿ
Charging Scale
Ÿ
Alternately a Recovery/Charging Station may
be used.
Ÿ
Thermistor Vacuum Gauge Sensor
Ÿ
Alternate charging technique- infrared
temperature sensor or thermocouple
Ÿ
Oil added for new system: 1oz new oil for
every 10 ft suction hose. [ Use proper oil ]
Ÿ
If using Recovery/Charging Machine follow
machines instructions for leak check
evacuation and charging.
05/31/2019
Updated
SERVICE
Содержание 830B
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