Installation Of Manifold Gauge Set; Leak Test - Mazda MX-5 1990 Workshop Manual

u
D
U-28
AIR CONDITIONER
05UOUX-091
05UOUX-046
05UOUX-092
05UOUX-094
..
Installation of manifold gauge set
Note
• Fittings for attaching the manifold gauge set are on
the high- and low-pressure pipes.
1 . Close both hand valves of the manifold gauge set.
2.
Connect the low-pressure hose to the low-pressure gauge
fitting and high-pressure hose to the high-pressure gauge
fitting.
3. Tighten the hose nuts by hand only.
Leak test
After evacuating the system (refer to page U-29), check for
leaks.
1. Connect a full refrigerant container to the service valve.
2. Open the high-pressure manual valve to charge the sys-
tem with refrigerant gas.
3. When the low-pressure gauge reads 98 kPa (1 kg/cm
2
,
14 psi), close the high-pressure manual valve.
4. Use a gas leak detector to check the system for leaks. If
a leak is found, repair the faulty component or connection;
then evacuate the system again.
Discharging
1. Connect the manifold gauge set to the refrigeration system.
2. Place the free end of the center hose on a shop towel.
3. Slowly open the high-pressure manual valve to allow the
refrigerant to escape.
Caution
• Open the valve only slightly.
If refrigerant is allowed to escape too fast, the com-
pressor oil will be drawn out of the system.
4. Check the shop towel to make sure no oil is being dis-
charged. If oil is present, partially close the manual valve.
5. After the manifold gauge reading drops below 343 kPa (3.5
kg/cm
2
,
50 psi), slowly open the low-pressure manual
valve.
6. As the system pressure drops, gradually open both the high-
and low-pressure manual valves until both gauges show
o
kPa (0 kg/cm
2
,
0 psi).
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