Mitsubishi Electric LGH-15RVX3-E Installation Instructions Manual page 7

4.1.5 Connecting the ducts
(1) Fasten the duct securely to the duct connecting flange, and wrap
aluminium tape (field supply) around the joints so that there is no
air leakage.
(2) Suspend the ducts from the ceiling so that their weight will not be
applied to the Lossnay unit.
(3) The two outdoor ducts must be covered with heat-insulating
material in order to prevent condensation from forming.
Models LGH-15 to 100RVX3-E
Heat-insulating
material
Taping
Outdoor Side
Models LGH-160 and 200RVX3-E
Taping
Heat-insulating material
Duct connecting
flange
Outdoor Side
CAUTION
• When the supply air is set twice as much as the exhaust air or
more by airflow function, the Lossnay body indoor side must be
put additional insulation. Without additional insulation, it could
cause condensation and water drop from the unit.
• When on-site commissioning is planned, a straight duct
length more than 10xD (D=duct diameter) from the source of
turbulence like bends, contractions and dampers etc, to the
measurement point is recommended for correct measurement.
In the United Kingdam, on-site measurement should
therefore be measured in accordance with BSRIA guideline
(Commissioning Air System. Application procedures for
buildings AG3/89.3(2001))
• Before attaching the ducts, check that no (debris or any other)
foreign matter (scraps of paper, vinyl, etc.) has found its way
inside the ducts.
• Do not touch the damper plate inside Lossnay unit when
connecting the ducts.
• If it is expected that the ambient temperature around the place
where the Lossnay unit is installed will be high during the
summer air conditioning season, it is recommended that the
indoor duct work be covered with insulation material.
• For LGH-160RVX3-E and LGH-200RVX3-E, thermistors are
built only in the lower unit. Lossnay unit controls its operation
according to the lower unit detecting temperature. Even when
actual return air temperature between the upper and the lower
unit is different, Lossnay operates according to the lower unit
temperature.
Room Side
Duct
Aluminium tape
Heat-insulating material
Lossnay
unit
Outdoor duct
Duct connecting flange
Duct
Room Side
Aluminium tape
Heat-insulating material
Lossnay
unit
Outdoor duct
Duct connecting flange
• Do not carry out the following types of duct construction.
(Doing so could cause a drop in the air volume and generate
abnormal noises.)
• Extremely • Multiple bends
sharp bends
4.1.6 When changing the direction of the out
door side duct (EA/OA) ···Except for LGH-160
and 200RVX3-E
(1) Removal of flange cover
Unscrewing the flange cover mounting screws (4 pcs), remove the
flange cover.
Flange cover
Mounting screw
(for flange cover)
(2) Installation of duct connecting flange
1. Install the duct connecting flange using attached mounting screws.
2. Fix the removed flange cover with the removed mounting screws
(4 pcs).
Duct connection flange
Mounting screw
(Accessory parts)
Eng-7
2303N22HHZA0013
• Bends right next • Extreme reduction in
to the outlet the diameter of the
connected ducts
Ceiling suspension fixture
Ceiling suspension fixture