Mitsubishi Electric Lossnay LGH-F1200RX5-E, Technical Manual

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U-6
CHAPTER 1
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Ventilation for Healthy Living
Comparing Centralized Ventilation and Independent Zoned Ventilation Methods
Centralized Ventilation Method Independent Zoned Ventilation Method
S
yst
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Fan Power
The air transfer distance is long, thus requiring
much fan power. As the air transfer distance is short, the fan power is
small.
Installation Area
• Independent equipment room is required.
• Duct space is required.
• Penetration of floors with vertical shaft is not
recommended in terms of fire prevention.
• Independent equipment room is not required.
• Piping space is required only above the ceiling.
Zoning
Generalized per system. Can be used for any one area.
Design
• Design of outer wall is not lost.
• The indoor supply air diffuser and return grille can
be selected without restrictions for an appropriate
design.
• The number of intakes and exhaust air outlets on
an outside wall will increase; design must be
considered.
• The design will be fixed due to installation fittings,
so the design of the intakes and exhaust air
outlets must be considered.
Control
• As the usage set time and ventilation volume
control, etc., are performed in a central monitoring
room, the user’s needs may not be met
appropriately.
• A large amount of ventilation is required even for
a few occupants.
• The user in each zone can operate the ventilator
without restrictions.
• The ventilator can be operated even during off-
peak hours.
Comfort
• An ideal supply air diffuser and return grille
position can be selected as the supply air diffuser
and return grille can be positioned without
restrictions.
• The only noise in the room is the sound of air movement.
• Antivibration measures must be taken as the fan in
the equipment room is large.
• Consideration must be made because of the
noise from the main unit.
• Antivibration measures are often not required as
the unit is compact and any generated vibration
can be dispersed.
S
yst
em Management
Maintenance and
Management
• Centralized management is easy as it can be
performed in the equipment room.
• The equipment can be inspected at any time.
• Work efficiency is poor because the equipment is
not centrally located.
• An individual unit can be inspected only when the
room it serves is vacant.
Trouble influence
• The entire system is affected.
• Immediate inspection can be performed in the
equipment room.
• Limited as only independent units are affected.
• Consultation with the tenant is required prior to
inspection of an individual unit.
Costs
Because there are many common-use areas, if the
building is a tenant building, an accurate
assessment of operating cost is difficult. Invoicing for each zone separately is possible, even
in a tenant building.