18.4 Refrigerant
charge
CAUTION
Do not charge OXYGEN, ACETYLENE, or other
fl
ammable and poisonous gases into the refrigerant
because an explosion can occur. It is recommended
that oxygen free nitrogen be charged for these types
of tests cycle when performing a leakage test or an
airtight test. These types of gases are extremely
dangerous, Insulate the unions and
fl
are-nuts at the
piping connection part completely.
Insulate the liquid piping completely to avoid a
decrease of performance;
if not, it will cause sweating on the surface of the pipe.
Charge refrigerant correctly. Overcharging or
insuf
fi
cient charging could cause a compressor
failure.
Check for refrigerant leakage in detail. If a large
refrigerant leakage occurred, it would cause dif
fi
culty
with breathing or harmful gases would occur if a
fi
re
were being used in the room.
If the
fl
are nut is tigthened too hard, the
fl
are nut may
crack after a long time and cause refrigerant leakage.
18.5 Caution of the pressure by check
joint
When the pressure is measured, use the check joint
of gas stop valve (A), and use the check joint of liquid
piping (B) in the
fi
gure below.
At that time, connect the pressure gauge according to
the following table because of high pressure side and
low pressure side changes by operation mode.
NOTE
Be careful that refrigerant and oil do not splash to the
electrical parts at removing the charge hoses.
C
B
A
The gas stayed at O-ring
s c r e w p a r t i s o p e n e d
a n d m a y m a k e s o u n d
.
p
a
c
e
h
t
g
n
i
v
o
m
e
r
n
e
h
w
H o w e v e r, i t i s n o t g a s
leakage.
18.6
Refrigerant Charging Quantity
Outdoor Units has been charged with refrigerant for
30m of actual piping length. An additional refrigerant
charged
is
required
in
systems
with
actual
piping
length longer than 30m.
1
Determine
an
additional
refrigerant
quantity
according
to
the
following
procedure,
and
charge
it
into the system.
2
Record the additional refrigerant quantity to facilitate
service activities thereafter.
www.canovate.com
l
l
P. +90 216 484 2222
Can BREE
ZE
Operating and Maintenance Cooling Unit Instructions 8-14 kW
l
41
