Suzuki RA410 Manual page 60

1B-8 AIR CONDITIONING (OPTIONAL)
MANIFOLD kg/cm
GAUGE psi
Lo Hi
0.15 – 0.25 1.37 – 1.57
1.5 – 2.5 14 – 16
21.3 – 35.5 200 – 227
0.5 – 0.6
Negative
5 – 6
pressure
71.2 – 85.3
Normal: Normal:
0.15 – 0.25 1.37 – 1.57
1.5 – 2.5 14 – 16
21.4 – 35.5 200 – 227
Abnormal: Abnormal:
Negative 0.69 – 0.98
pressure 7 – 10
100 – 142
0.05 – 0.1
0.5 – 1.0
4.2 – 14.2
0.69 – 0.98
7 – 10
100 – 142
0.4 – 0.6
4 – 6
56.9 – 85.3
0.25 – 0.3
2.5 – 3.0 2 5 3 0
35.6 – 42.6
1.96 – 2.45
20 – 25
285 – 355
0.3 – 0.4
3.0 – 4.0
42.7 – 56.8
MPa
2
CONDITION
Normal condition.
The low pressure side
reads a negative pressure,
and the high pressure side
reads an extremely low
pressure.
Presence of frost around
tubing to and from receiver/
dryer and expansion valve.
During A/C operation, the
low pressure side some-
times indicates negative
pressure, and sometimes
normal pressure. Also high
pressure side reading fluc-
tuates between the abnor-
mal and normal pressure.
Both low and high pres-
sure sides indicate low
readings.
Continuous air bubbles
are visible through sight
glass.
Output air is slightly cold.
Pressure on low pressure
side is high.
Pressure on high pressure
side is low.
Both pressure becoming
equal right after A/C is
turned OFF.
High pressure reading on
both low and high pres-
sure sides.
Air bubbles are not visible
even when engine rpm is
lowered.
High pressure reading on
both low and high pres-
sure sides.
Low pressure side tubing
is not cold when touched.
Air bubbles are visible
through sight glass.
High pressure reading on
both low and high pres-
sure sides.
Large amount of frost or
dew on the low pressure
side tubing.
CAUSE
Dust particles or water
droplets are either
stuck or frozen inside
expansion valve, pre-
venting the refrigerant
from flowing.
Gas leak from heat-
sensitising tube is pre-
venting refrigerant flow.
Expansion valve is fro-
zen due to moisture in
the system, and tempo-
rarily shuts off the re-
frigeration cycle.
Insufficient refrigerant
in system.
(Refrigerant leaking)
Internal leak in com-
pressor.
Overcharged A/C sys-
tem.
Faulty condenser cool-
ing operation.
Faulty condenser fan
operation.
Presence of air in A/C
system.
(Improperly evacuated)
Faulty expansion valve
or improper attachment
of heat-sensitizing tube.
Refrigerant flow is not
regulated properly.
CORRECTION
Clean expansion valve.
Replace it if it cannot be
cleaned.
Replace receiver/dryer.
Evacuate the A/C system
and recharge with fresh
refrigerant.
If heat-sensitizing tube is
defective, replace expan-
sion valve.
Replace expansion valve.
Replace receiver/dryer.
Evacuate A/C system and
recharge with fresh refrig-
erant.
Using a gas leak detector,
check for leaks and repair
as necessary.
Recharge refrigerant to a
specified amount.
If the pressure reading is
almost 0 when the
manifold gauges are at-
tached, check for any
leaks, repair them, and
evacuate the system.
Inspect compressor and
repair or replace as nec-
essary.
Adjust refrigerant to speci-
fied amount.
Clean condernser.
Inspect and repair con-
dernser fan.
Replace receiver/dryer.
Inspect quantity of com-
pressor oil and presence
of contaminants in oil.
Evacuate system and re-
charge with fresh refriger-
ant.
Inspect if heat-sensitizing
tube is properly attached.
Replace expansion valve.