Mitsubishi Electric ECOV-X37VA Manuel D'installation page 11

[7] Additional Precautions
Additional Precautions
To avoid damage to the unit, use appropriate
tools to install, inspect, or repair the unit.
Recover all refrigerant in the unit, and dispose of
it properly according to any applicable laws and
regulations.
Do not repeatedly turn on and off the main power
supply switch in less than 10 minutes. Doing so
may stress the compressor and cause the com-
pressor to malfunction.
Operate the unit within the specified usage
range. The use of the unit outside the specified
operation range may cause the unit to malfunc-
tion.
Do not block the inlets or outlets of the unit. Ob-
struction of air flow may reduce the performance
of the unit or cause the unit to malfunction.
Do not touch the switches on the unit or the
components of the refrigerant circuit for no
good reason. Doing so may change the operat-
ing mode and result in damage to the unit.
Only use R744. The use of refrigerant other than
R744 may result in damage to the refrigerant
system components.
Provide a maintenance access to allow for the in-
spection of pipes above the ceiling or the buried
pipes.
Take appropriate measures against electrical
noise interference when installing the air condi-
tioning units in hospitals or facilities with radio
communication capabilities. Inverter, high-fre-
quency medical, or wireless communication
equipment as well as power generators may
cause the air conditioning system to malfunc-
tion. Air conditioning system may also adversely
affect the operation of these types of equipment
by creating electrical noise.
Direct the blazing torch flame away from the ad-
jacent wires and sheet metal to keep them from
being overheated and damaged.
Prepare tools for exclusive use with R744. Do
not use the following tools if they have been
used with other types of refrigerant: gauge man-
ifold, charging hose, refrigerant leak detector,
check valve, refrigerant charge spout, vacuum
gauge, and refrigerant recovery equipment. If
other types of refrigerant, refrigerant oil, or wa-
ter remaining on these tools enter the refrigerant
circuit, the refrigerant oil in the new system may
deteriorate and the equipment may malfunction.
Use a vacuum pump with a check valve so that
the vacuum pump oil will not backflow into the
refrigerant circuit and cause the refrigerant oil to
deteriorate.
Have a set of tools for exclusive use with R744.
Consult your nearest Mitsubishi Electric Dealer.
Keep dust, dirt, and water off the charging hose.
Infiltration of dust, dirt, or water into the refriger-
ant circuit may cause the refrigerant oil to dete-
riorate or damage the compressor.
Use refrigerant piping and couplings that are
suitable for use with R744. Keep the inner and
outer surfaces of pipes and couplings clean and
free of such contaminants as sulfur, oxides,
dust, dirt, shaving particles, oil, and moisture.
Failure to do so may result in the deterioration of
refrigerant oil and compressor failure.
Store the piping materials indoors, and keep both
ends of the pipes sealed until immediately before
brazing. Keep elbows and other joints in plastic
bags. Infiltration of dust, dirt, or water into the re-
frigerant circuit may cause the refrigerant oil to
deteriorate or damage the compressor.
To reduce the risk of oxidized film from entering
the refrigerant pipe and causing the refrigerant
oil to deteriorate or damaging the compressor,
braze pipes under nitrogen purge.
Do not use the existing pipes. The high and low
pressures in R744 systems are higher than
those in the systems using other types of refrig-
erants, and the use of pipes not suitable for R744
may result in damage to the unit.
Charge the refrigerant from the high-pressure
side. Charging the refrigerant from the low-pres-
sure side may result in compressor damage.
Do not use a charging cylinder.
To reduce the risk of power capacity shortage,
always use a dedicated power supply circuit.
To reduce the risk of both the breaker on the unit
side and the upstream breaker from tripping and
causing problems, split the power supply sys-
tem or provide protection coordination between
the earth leakage breaker and no-fuse breaker.
Have a backup system, if failure of the unit has a po-
tential for causing significant problems or damages.
The installer must carry an R744 leak detector
when installing or uninstalling the unit.
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