Safety Precautions - Mitsubishi Electric FRESH MASTER GUF-50RDH3 Handbook

Safety precautions

Please be sure to read the following safety precautions thoroughly before commencing with the maintenance
work, and conduct the inspection and repair of the product in a safe manner.
The types and levels of danger that may arise if the product is handled incorrectly are described by using the
warning symbols shown below.
Warning
♦ ♦
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 elec-
tric shock.)
♦ ♦
Modification is prohibited
Do not modify the unit.
(Failure to heed this warning may result in elec-
tric shock, fire and/or bodily injury.)
♦ ♦
Do not mix anything other than (Use 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 bodily injury or other
damage.)
♦ ♦
Toxic gas generation
•Be careful that the coolant (R407C,R410A,R22) does
not leak in a flammable environment.
•Conduct welding operation in an open room.
•If the coolant gas leaks, open the windows while in
operation.
•Be sure to completely repair the leak. Close the ser-
vice valve if the repair work is temporarily suspended.
(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 result in serious injury
or death.
♦ ♦
Turn off the power supply
Be sure to shut off the breaker before dis-
assembling the unit for repair.
(Failure to heed this warning may result in elec-
Caution for
tric shock.)
electric shock
♦ ♦
Use proper parts and tools
For repair, be sure to use the parts listed in the service
parts list of the applicable unit model and
use the proper tools.
Prohibited
(Failure to heed this warning may result in elec-
tric shock, fire and/or bodily 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 Work
Prohibited
Guide.
(Incomplete 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 wire
in the event that they are damaged and/or
degraded.
(Failure to heed this warning may result in elec-
tric shock and/or fire.)
♦ ♦
Check insulation
Be sure to measure the insulation resistance once the
Be sure to follow
repair work is complete, and turn on the power supply
this instruction.
after verifying that an insulation resistance
of at least 1MΩ is obtained.
(If an insulation problem exists, it may result in
electric shock.)
— 3 —
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.