Panasonic MDF-DU702VH, Service Manual

Page: 74 / 78

PRECAUTIONS
Before installation
●
Liquid CO
2
cylinder should be a siphon type cylinder
●
Only liquid CO
2
can be used for this system. Never use other kinds of gases.
●
Liquid CO
2
loses its cooling capacity when the ambient temperature is above +31
℃
. Do not install the
liquid CO
2
cylinder in a place exposed to direct sunlight or near heat-emitting appliances such as stoves
and heaters. The back-up time per 1 liquid CO
2
cylinder depends on the ambient temperature. Install a
liquid CO
2
cylinder in the cool location.
At installation
After installation
●
Conduct a leakage test of the liquid CO
2
cylinder and connecting area.
●
Check that liquid CO
2
is injected into the freezer chamber. Refer to the “Injection Test” for an explanation of the
testing procedure.
●
The connecting pipe between the liquid CO
2
cylinder and the
backup cooling kit should not be installed in a place where it may
be bumped in a passage.
●
Use the connecting pipe provided with the backup cooling kit.
Run the connecting pipe in a coil or U-bend formation to act as a
cushion (see figure).
●
Do not let foreign particles or water get into the pipe or joints.
●
The length of time in which a 30kg liquid CO
2
cylinder can
maintain a temperature of -70
℃
is shown in the another sheet
“Ambient Temperature vs. -70
℃
Holding Time of Liquid CO
2
cylinder (30kg)”.
Install the required number of cylinders according to the customer’
s desired back-up time.
●
Liquid CO
2
cylinder should be installed in a special cylinder
stand (see figure). Never install the cylinder without the stand. If
you have difficulty in obtaining the stand, contact your dealer.
●
Before installation, tell the customer about cylinder storage and exchange procedures at the time of cylinder
inspection according to high-pressure gas regulations.
ambient temp.(
℃
)
ambient temp.(
℃
)
tim
e(
ho
ur
)
tim
e
(h
o
u
r)
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