King Long XMQ6127J series, Operating Manual

Page: 129 / 140

Common trouble and elimination
C-19
No. Pressure Description Analysis Remedy
4
The high and low
pressure are
much higher than
the normal value
and the needle of
the gauge swing
obviously
The cooling capability
is
Insufficient and the
system has air and the
bubbles seen in the
inspection glass
Air mixed in the
refrigerant The
vacuum is not
good for the first
time filling
refrigerant or
after the
maintenance
Discharge the
refrigerant in
the system
and change
the desiccators
and also make
the vacuum
repeatedly for
filling the
refrigerant
5
The high
pressure is
higher than the
normal value and
the low pressure
is nearly to zero
or negative value
and the gauge
swing seriously
The air sent to the
bus sometime cold
and sometimes
warm and the
inspection glass
looks yellow
Too much water
in the system
desiccators
reaching the
saturation
the frosting
water blocked
the
expanding valve
Change the
desiccators and
make the
vacuum
repeatedly and
then re-fill the
refrigerant
6
The low pressure
is much higher
than the normal
value and the
high pressure is
a little bit higher
than the normal
value
Cold is in sufficient
The condenser
blower doesn’t
work normally
or there is
blockage in the
condenser
radiator
Check the
electric circuit
diagram or
cleaning the
condenser
7
The high are low
and low
pressure are
higher than the
normal values
The cold air is
insufficient
Compressor
interior failure
Repair or change
the compressor
8
The high and low
pressure are
lower than the
normal value
Evaporator wind flow
is insufficient
Evaporator
blower not
running or low
in efficiently or
the radiator of
the evaporator
blocked
Check the
electric circuit
diagram or clean
the evaporator
radiator