475 / 948
HVAC
40
Based on the values the following conclusions can be inferred and further troubleshooting can be done.
Low Pressure side
in kg/cm
2
( M Pa)
High Pressure side
in kg/cm
2
( M Pa)
Remarks
Symptoms
Possible reasons
1.5-2.5
(0.15-0.25)
14-16
(1.37-1.57)
System pressure
is normal
Normal cooling
AC system working
normal
0.5-1.0
(0.05-0.1)
7-10
(0.69-0.98)
Pressure low
Insufficient cooling
1. Refrigerant quanti-
ty too small.
2.Gas leakage.
Vacuum
5-6
(0.5-0.6)
Refrigerant fails to
circulate
No cooling expe-
rienced
Clogging of AC cy-
cle.
Initially 1.5-2.5
(0.15 -0.25) and
later vacuum
Initially 14-16 (
1.37-
1.57)and later
7-10
(0.69-0.98)
Moisture present
in system.
Initially
works
normally but later
no cooing experi-
enced
Freezing of expan-
sion valve due to
presence of mois-
ture.
4-6
(0.4-0.6)
7-10
(0.69-0.98)
Pressure on low
pressure side is
high and pressure
on high pressure
side is low.
No cooling.
Compressor Defec-
tive.
2.5- 3.5
( 0.25 –
0.35)
20-25
( 1.95-2.45)
System pressure
is high.
Only Insufficient
cooling.
Excessive refriger-
ant in the system
causing insufficient
condenser cooling.
Insufficient cooling
with low pressure
piping will be hot.
Air has entered the
system.
In sufficient cool-
ing with frost or
large amount of
dew on low pres-
sure piping
TXV valve faulty.