Suzuki RA410, Manual

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1B-8 AIR CONDITIONING (OPTIONAL)
MPa
MANIFOLD kg/cm
2
GAUGE psi
CONDITION CAUSE CORRECTION
Lo Hi
0.15 – 0.25
1.5 – 2.5
21.3 – 35.5
1.37 – 1.57
14 – 16
200 – 227
Normal condition.
Negative
pressure
0.5 – 0.6
5 – 6
71.2 – 85.3
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.
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.
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.
Normal:
0.15 – 0.25
1.5 – 2.5
21.4 – 35.5
Abnormal:
Negative
pressure
Normal:
1.37 – 1.57
14 – 16
200 – 227
Abnormal:
0.69 – 0.98
7 – 10
100 – 142
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. Expansion valve is fro-
zen due to moisture in
the system, and tempo-
rarily shuts off the re-
frigeration cycle. Replace expansion valve.
Replace receiver/dryer.
Evacuate A/C system and
recharge with fresh refrig-
erant.
0.05 – 0.1
0.5 – 1.0
4.2 – 14.2
0.69 – 0.98
7 – 10
100 – 142
Both low and high pres-
sure sides indicate low
readings.
Continuous air bubbles
are visible through sight
glass.
Output air is slightly cold.
Insufficient refrigerant
in system.
(Refrigerant leaking)
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.
0.4 – 0.6
4 – 6
56.9 – 85.3
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.
Internal leak in com-
pressor. Inspect compressor and
repair or replace as nec-
essary.
0.25 – 0.3
2 5 3 0
High pressure reading on
both low and high pres-
sure sides.
Air bubbles are not visible
even when engine rpm is
lowered.
Overcharged A/C sys-
tem.
Faulty condenser cool-
ing operation.
Faulty condenser fan
operation.
Adjust refrigerant to speci-
fied amount.
Clean condernser.
Inspect and repair con-
dernser fan.
2.5 – 3.0
35.6 – 42.6
1.96 – 2.45
20 – 25
285 – 355
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.
Presence of air in A/C
system.
(Improperly evacuated)
Replace receiver/dryer.
Inspect quantity of com-
pressor oil and presence
of contaminants in oil.
Evacuate system and re-
charge with fresh refriger-
ant.
0.3 – 0.4
3.0 – 4.0
42.7 – 56.8
High pressure reading on
both low and high pres-
sure sides.
Large amount of frost or
dew on the low pressure
side tubing.
Faulty expansion valve
or improper attachment
of heat-sensitizing tube.
Refrigerant flow is not
regulated properly.
Inspect if heat-sensitizing
tube is properly attached.
Replace expansion valve.