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SELECTION OF INSTALLATION PLACE
CAUTION
CAUTION
Do not install the air conditioner at place where combustible gas may leak.
If gas leaks and is collected at surrounding the unit, the production of fire may be caused.
Upon customer’s approval, install the air conditioner at a place which satisfies the following
conditions.
• Place where it can be installed horizontally.
• Place which can reserve a service space for safe maintenance or check.
• Place where there is no problem even if the drained water flows.
• Place which can be soundproofed (above the ceiling, etc.).
*Use ceiling board materials with highly soundproof effect (drywalls, etc.).
Do not install the unit outside; otherwise a trouble may be caused.
• Place where a check opening can be provided.
Avoid installing in the following places.
• Salty place (seaside area) or place with much gas sulfide (hot spring area)
(If selecting such a place, a special maintenance is required.)
• Place where oil (including machine oil), steam, oil smoke or corrosive gas generates.
• Place where a device generating high frequency (inverter, non-utility generator, medical apparatus, or
communication equipment) is set.
(A bad influence may generate by malfunction of the air conditioner, control trouble, or noise for such
equipment.)
• Place where there are something that must not become wet under the unit installed.
*When the humidity reaches 80% or more, water droplets may fall from the unit, causing the property damage.
• Place where an organic solvents is used.
• Place near a door or window exposed to high humidity outside air.
(Dew dropping may form.)
• Place where special spray is used frequently.
• Apply electric insulation between metal section of the building and metal section of the air conditioner in
conformance with the Local Regulation.
Caution when installing the PMV Kit at a place with low background noise
This PMV Kit has a built-in pulse motor valve (expansion valve), generating refrigerant sounds during operation.
Thus, avoid installing it in the following rooms with low background noise and install it in isolated spaces from a
living space.
• Room with low background noise: bedrooms, hospital rooms, or hotel rooms.
• Room without ceiling boards where the PMV Kit is not isolated from living space.
• Room with opening part on the ceiling.
PMV Kit outline
Purpose of using
In the case of very quiet room, and also very nervous for indoor unit noise level, PMV Kit should be installed before
indoor unit which should become lower noise level.
Multi-indoor units have Pulse Motor Valve (PMV) for control refrigerant flow.
Multi-air conditioner, in unstable condition, for example starting time, flowing noise of refrigerant or defrosting time
can be heard conspicuously.
This refrigerant noise mainly comes from PMV. Especially in very quiet room, for example bed room, somebody
feels uncomfortable for this refrigerant noise from PMV.
Main purpose of PMV Kit restrains refrigerant noise which comes from PMV installed in indoor unit.
PMV Kit should be installed at out of residence area, for example back of ceiling board or along passage way.
After installed PMV Kit, control function of refrigerant shifts to PMV of PMV Kit and PMV in indoor unit is not used.
After that, refrigerant noise of PMV will be coming from back ceiling board, and refrigerant noise of indoor unit may
be restrained.
Image of installation
Without PMV Kit
With PMV Kit
To
outdoor unit
Refrigerant pipe
Ceilling
Indoor unit
[Living space]
gobo... gobo.... glug glug....
Shuru shuru...
[Underpart of the roof]
To
outdoor unit
[Underpart of the roof]
Connection cable
Refrigerant pipe
(Liquid side)
Indoor unit
[Living space]
Refrigerant noise is small.
PMV Kit
Passage way
gobo... gobo.... glug glug....
Shuru shuru...
Ceilling
15-EN
16-EN
