Safety Precautions; Electric Shock; Modification Is Prohibited; Turn Off The Power Supply - Mitsubishi Electric GUG-01SL-E 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.)
Use only the specified refrigerant (R410A) to
charge the refrigerant lines.
• Do not mix it with any other refrigerant and do not
allow air to remain in the lines.
(If air is mixed with the refrigerant, then it can cause
abnormal high pressure in the refrigerant line, and
may result in an explosion and other hazards.)
(The use of any refrigerant other than that specified
for the system will cause mechanical failure or
system malfunction or unit breakdown. In the worst
case, this could seriously damage product safety.)
• Tighten all flare nuts as specified using
a torque wrench.
(If tightened too much, the flare nut can
break after an extended period.)
Toxic gas generation
• Be careful that the refrigerant (R410A) does not
leak in a flammable environment.
• Conduct welding operation in an open room.
• If the refrigerant 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 refrigerant gas comes into contact
with flames such as open fire, sparks
and a heater, it may generate toxic gas.)
Warning
Caution against
electric shock
Prohibited
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Incorrect handling of the product may
result in serious injury or death.

Turn off the power supply

Be sure to shut off the power supply isolator before
disassembling 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 catalog 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 your
local "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 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.