Safety Precautions - Mitsubishi Fresh Master GUF-50RD4 Handbook

1. Safety precautions

Read the following precautions thoroughly before the maintenance, and then inspect and repair the product in a
safe manner.
The types and levels of danger that may arise if the product is handled incorrectly are described with the warning
symbols shown below.
Electric shock
If you must inspect the circuitry while the power is
on, do not touch the live parts.
(Failure to heed this warning may result
in electric shock.)
Modification is prohibited
Do not modify the unit.
(Failure to heed this warning may result
in electric shock, fire and/or injury.)
Do not mix anything other than the specified
coolant of the same type used in the outdoor
unit.
Do not charge any coolant different from the coolant
used in the outdoor unit.
(Failure to heed this warning may cause
the pressure inside the freezing cycle
to become abnormally high, leading to
injury or other damage.)
Toxic gas generation
• Be careful that the coolant (R407C, R410A) does
not leak in a flammable environment.
• Conduct welding operation in an open room.
• If the coolant gas leaks, open the windows while
servicing.
• Be sure to completely repair the leak. Close the
service valve if the repair work is temporarily sus-
pended.
( If the coolant gas comes into contact
with flames such as open fire, sparks
and a heater, it may generate toxic gas.)
Incorrect handling of the product may
Warning
result in serious injury or death.
Caution against
electric shock
Prohibited
Prohibited
Be sure to follow
this instruction.
Turn off the power supply
Be sure to shut off the power supply isolator before dis-
assembling the unit for repair.
(Failure to heed this warning may result
in electric shock.)
Use proper parts and tools
For repair, be sure to use the parts listed in the
service parts list of the applicable model and use the
proper tools.
(Failure to heed this warning may result in
electric shock, fire and/or injury.)
Proper electric work
Use the electric wires designated for electric work, and
conduct electric work in accordance with the "Electric
Installation Engineering Standard", the "Indoor Wiring
Regulations", and the Installation Instructions.
(Improper connection or wiring installation
may result in electric shock and/or fire.)
Replace damaged and/or degraded parts
Be sure to replace the power-supply cord and lead
wires if they are damaged and/or degraded.
(Failure to heed this warning may result in
electric shock and/or fire.)
Check insulation
Upon completing repair work, always measure the
insulation resistance. Verify that it is at least 10 MΩ
(with a 500 V DC insulation resistance tester), and
then turn on the power.
(Inadequate insulation may result in
electric shock.)
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Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.