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Mitsubishi Electric PURY-HP72 Service Handbook page 5

R410a
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To reduce the risk of drain water overflow,
install the unit horizontally, using a level.
[4] Piping Work
Piping Work
To reduce the risk of injury, including frost
bites, that may result from being blasted
with refrigerant, use caution when operat-
ing the refrigerant service valve. If refriger-
ant leaks out and comes in contact with an
open flame, toxic gases may be generated.
To reduce the risk of refrigerant catching
fire and causing burns, remove the refriger-
ant gas and the residual refrigerant oil in the
pipes before heating them.
To reduce the risk of pipe damage, refriger-
ant leakage, and oxygen deprivation, use
pipes that meet the pipe thickness specifi-
cations, which vary by the type of refriger-
ant used, pipe diameter, and pipe material.
To reduce the risk of pipe burst or explo-
sion, evacuate the refrigerant circuit using a
vacuum pump, and do not purge the system
with refrigerant.
To reduce the risk of explosion and deterio-
ration of refrigerant oil caused by chloride,
do not use oxygen, flammable gas, or refrig-
erant that contains chloride as a pressuriz-
ing gas.
To prevent explosion, do not heat the unit
with refrigerant gas in the refrigerant circuit.
To reduce the risk of pipe bursting and ex-
plosion due to abnormal pressure rise, do
not allow any substances other than R410A
(such as air) to enter the refrigerant circuit.
[5] Wiring Work
Wiring Work
To reduce the risk of wire breakage, over-
heating, smoke, and fire, keep undue force
from being applied to the wires.
To reduce the risk of refrigerant leakage and
resultant oxygen deprivation, use the flare
nut with holes that is supplied with the re-
frigerant service valve.
To reduce the risk of refrigerant leakage and
resultant oxygen deprivation, use the flare
nut that is supplied with the unit or its equiv-
alent that meets applicable standards.
To reduce the risk of damage to the unit,
and resultant refrigerant leakage and oxy-
gen deprivation, tighten flare nuts to a spec-
ified torque.
To reduce the risk of oxygen deprivation
and gas poisoning, check for gas leakage
and keep fire sources away.
Insulate pipe connections after completing
the air tightness test. Performing an air
tightness test with the pipe being insulated
may lead to failure to detect refrigerant leak-
age and cause oxygen deprivation.
To reduce the risk of pipe damage and re-
sultant refrigerant leakage and oxygen de-
privation, keep the field-installed pipes out
of contact with the edges of components.
To reduce the risk of water leakage and re-
sultant damage to the furnishings, drain
piping work must be performed by your
dealer or qualified personnel according to
the instructions detailed in the Installation
Manual.
To keep the ceiling and floor from getting
wet due to condensation, properly insulate
the pipes.
To reduce the risk of wire breakage, over-
heating, smoke, or fire, properly secure the
cables in place and provide adequate slack
in the cables so as not to stress the termi-
nals.
iv

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