12.6 Caution to be taken at the time daily inspection
Instruct users to comply with the following items.
– 36 –
No. Item Contents Care to be taken at the time of operation Anticipated defect Disposition (remarks)
1
2
3
4
5
6
Check for gas
leakage
Washing of
condenser coil
Painting of the
body
Caution to be
taken when not
using for long
Caution to be
taken when the
refrigeration
unit is not
used.
Caution to be
taken when a
refrigerator
truck is used
instead of a
refrigerator.
• Perform this as a daily
inspection as the amount
of refrigerant and water
in the refrigeration can
be checked by sight
glass.
• Prevention of dropping of
heat exchange due to
stain of coil
• Disposition for peeling of
paint on the metal section
of the units which have
been used for long and
for occurrence of rust.
• When not using for long,
decrease the refrigerant
staying in the compressor
and prevent the shaft seal
from running out of oil.
• Do not remove the
compressor belt.
• Preparatory refrigeration,
keeping load in
refrigeration, in case of
using an power-driven
equipment sold at a
market for long instead
of a refrigeration in order
to refrigerate and excess
load at night, prevention
of defroster from troubles
1. Amount of refrigerant
When the amount of refrigerant is short
due to gas leakage, there are lots of
bubbles, and when extremely short, it
looks white (flashing condition)
2. Existence of water
It is normal when the check color is
green, and abnormal when the color is
yellow with more than 140ppm
(refrigerant temperature 38°C) water.
1. The fin will be crushed if it is washed
directly by high pressure water current.
So wash it with brush by water current
from a hose.
1. The rust generated on the painted
surface due to a frying stone or scratch,
will develop without being aware of it.
Rust in early stage can be well prevented
from developing by touch up.
1. When the unit is not used for long,
operate it about 15 minutes once in
every three or four days.
In case of type 2
(Run the engine and motor about 15
minutes once in every three or four days.
1. Do not remove the compressor belt even
if a vehicle is used and the refrigeration
is not used for long.
• In case of using a refrigerator truck for
long instead of a refrigerator, make a
storeroom temperature up to plus degree
once a week and melt the ice frosted.
1. Insufficient amount of
refrigerant
• Defective refrigeration
or no refrigeration
• Rizing of delivery gas
temperature
2. Inflow of water
• Clogging of expansion
valve
• Clogging of receiver
dryer or dryer
1. Stain of condenser coil.
Insufficient operation of
DPS and capacity of
refrigeration
1. Hole and crank in panel.
2. Falling off of panel
1. When the compressor is
not used for long, it will
hold refrigerant liquid in
it, which, when started,
will cause lack of
lubrication and burning
of the compressor. And
also running out of oil in
shaft seal section may
cause leakage of
refrigerant gas.
1. Though shaft bearings
are in the condition of
being fixed by tension of
belt, fretting corrosion
may be generated on
affected place due to
vibration if a vehicle is
run with belt removed.
1. Clogging of drain pipe
due to freezing of
defrosted water or
developing of ice due to
failure of draining may
crush defrost pipe and
cooling coil.
1. Check for leakage and
repair if any, and then
supply refrigerant.
2-1. After recovering
refrigerant and
replacing dryer,
vacuumize it and then
charge a fixed amount
of refrigerant.
2-2. Check and supply
amount of the
compressor in the
same way.
1. Remove and wash stain
of coil as often as
possible.
1. When occurrence of rust
is confirmed, clean the
affected place by sand
paper in early stage and
repair by touch up.
2. Replace the part which
has developed to opening
of hole or crack.
To a servicing shop.
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