Mitsubishi Electric City Multi PURY-EM200YNW-A1, Service Handbook

Page: 5 / 503

iv
[5] Wiring Work
[6]
Relocation and Repairs
When installing or relocating the unit, do
not allow air or any substance other than
the specified refrigerant to enter the refrig-
erant lines.
 Any substance other than the specified refrigerant may
cause abnormally high pressure in the refrigerant
lines, resulting in bursting of the pipes or an explosion.
After the installation has been completed,
check for refrigerant leaks.
 If the refrigerant leaks, oxygen starvation may result. If
the leaked refrigerant comes in contact with a heat
source, toxic gas will be generated.
Have a fire extinguisher nearby before braz-
ing work.
 If the refrigerant leaks while brazing work is being per-
formed, fire may result.
Provide no-smoking signs at the brazing
workplace.
 If the refrigerant leaks when an ignition source is pres-
ent, fire may result.
Pipes with outer diameter exceeding 33.4
mm are subject to the Pressure Equipment
Directive (PED), and brazing of these pipes
must be done by PED certified personnel.
Wiring Work
Include some slack in the power cables.
 Failure to do so may break or overheat the cables, re-
sulting in smoke or fire.
Connections must be made securely and
without tension on the terminals.
 Improperly connected cables may break, overheat, or
cause smoke or fire.
Tighten all terminal screws to the specified
torque.
 Loose screws and contact failure may result in smoke
or fire.
Electrical work must be performed by quali-
fied personnel in accordance with local reg-
ulations and the instructions provided in
this manual. Only use the specified cables
and dedicated circuits.

Inadequate power source capacity or improper electri-
cal work will result in electric shock, malfunction, or
fire.
Install an earth leakage breaker on the pow-
er supply of each unit.
 Failure to do so may result in electric shock or fire.
Only use properly rated breakers (an earth
leakage breaker, local switch <a
fuse that meets local electrical codes>, or
overcurrent breaker).
 Failure to do so may result in electric shock, malfunc-
tion, smoke, or fire.
Only use standard power cables of suffi-
cient capacity.
 Failure to do so may result in current leakage, over-
heating, smoke, or fire.
Proper grounding must be provided by
qualified personnel.
 Improper grounding may result in electric shock, fire,
explosion, or malfunction due to electrical noise. Do
not connect the ground wire to gas or water pipes,
lightning rods, or telephone ground wires.
After the wiring work has been completed,
measure the insulation resistance, and
make sure that it reads at least 1 M
Ω .
 Failure to do so may result in electric leakage, malfunc-
tion, or fire.
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