· The A/C system must contain at least 0.88 lb. (0.4 kg) of refrigerant. The manifold gage set can
determine if pressure exists in the system.
· Leaks that are in the high side of the A/C system are more easily found if the air conditioner is
operated for 5 to 10 min. The leak test must be performed immediately after the unit is turned off.
The leak test for the high side needs to be performed before the pressure in the A/C system
· Leaks that are in the low side of the A/C system are more easily found if the air conditioner has
been shut off for 5 to 10 min. The leak test for the low side needs to be performed before the
pressure in the A/C system equalize.
Move leak detector sensor tip along possible leak points, at a rate of one inch per second.
Leak detector will notify mechanic if leak is present in A/C system.
If service is required on the air conditioning system, refrigerant must be recovered before A/C system components are
removed. Use the following procedure:
Refrigerant identifier will prevent other refrigerants from contaminating R-134a recovery and
charging tools. Refrigerant identifier will also detect a percentage of air that may be in the A/C system.
Use refrigerant identifier to ensure refrigerant in A/C system is R134a
Make sure that both manifold gauge set (1)
valves (2) and (3) are closed. Turn valves (2)
and (3) clockwise to close.
· Contact with refrigerant can cause
prevent personal injury.
· Protective goggles must always be worn
when refrigerant lines are opened, even if
the gauges indicate the system is empty.
· Do not smoke when servicing air
conditioners or wherever refrigerant gas
may be present. Personal injury or death
can result from inhaling refrigerant
through a lit cigarette.
Install manifold gage set (1) low-side hose (4) to suction (low) side of A/C compressor.
Install manifold gauge set (1) high-side hose (5) to discharge (high) side of A/C compressor.